BUG: workqueue lockup
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syzbot
Apr 22, 2019, 4:37:05 PM4/22/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: c98875d9 Linux 4.19.36
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=162de877200000
kernel config: https://syzkaller.appspot.com/x/.config?x=5e40ac5fbcc6366d
dashboard link: https://syzkaller.appspot.com/bug?extid=07af6c37cf925e122259
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14827e18a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143e2603200000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+07af6c...@syzkaller.appspotmail.com
BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 163s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256
in-flight: 14:rtc_timer_do_work
pending: vmstat_shepherd, cache_reap, check_corruption
======================================================
WARNING: possible circular locking dependency detected
4.19.36 #4 Not tainted
------------------------------------------------------
syz-executor552/5042 is trying to acquire lock:
000000005fe6f918 (console_owner){-.-.}, at: log_next
kernel/printk/printk.c:497 [inline]
000000005fe6f918 (console_owner){-.-.}, at: console_unlock+0x41f/0x10c0
kernel/printk/printk.c:2397
but task is already holding lock:
00000000940f00d9 (&(&pool->lock)->rlock){-.-.}, at:
show_workqueue_state.cold+0x879/0x11dc kernel/workqueue.c:4557
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&pool->lock)->rlock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
__queue_work+0x23d/0x10e0 kernel/workqueue.c:1417
queue_work_on+0x192/0x200 kernel/workqueue.c:1486
queue_work include/linux/workqueue.h:512 [inline]
schedule_work include/linux/workqueue.h:570 [inline]
put_pwq kernel/workqueue.c:1090 [inline]
put_pwq+0x178/0x1d0 kernel/workqueue.c:1075
put_pwq_unlocked.part.0+0x34/0x70 kernel/workqueue.c:1107
put_pwq_unlocked kernel/workqueue.c:1101 [inline]
destroy_workqueue+0x617/0x6f0 kernel/workqueue.c:4217
do_floppy_init drivers/block/floppy.c:4704 [inline]
floppy_async_init+0x202c/0x216b drivers/block/floppy.c:4721
async_run_entry_fn+0x126/0x570 kernel/async.c:127
process_one_work+0x98e/0x1760 kernel/workqueue.c:2153
worker_thread+0x98/0xe40 kernel/workqueue.c:2296
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
-> #3 (&pool->lock/1){..-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
__queue_work+0x23d/0x10e0 kernel/workqueue.c:1417
queue_work_on+0x192/0x200 kernel/workqueue.c:1486
queue_work include/linux/workqueue.h:512 [inline]
tty_schedule_flip drivers/tty/tty_buffer.c:408 [inline]
tty_flip_buffer_push+0xc5/0x100 drivers/tty/tty_buffer.c:551
pty_write+0x1a6/0x200 drivers/tty/pty.c:124
n_tty_write+0xb06/0x1100 drivers/tty/n_tty.c:2354
do_tty_write drivers/tty/tty_io.c:960 [inline]
tty_write+0x45b/0x7a0 drivers/tty/tty_io.c:1044
__vfs_write+0x116/0x820 fs/read_write.c:485
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0xea/0x1f0 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&(&port->lock)->rlock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
tty_port_tty_get+0x22/0x80 drivers/tty/tty_port.c:288
tty_port_default_wakeup+0x16/0x40 drivers/tty/tty_port.c:47
tty_port_tty_wakeup+0x5d/0x70 drivers/tty/tty_port.c:390
uart_write_wakeup+0x46/0x70 drivers/tty/serial/serial_core.c:103
serial8250_tx_chars+0x4a4/0xb20
drivers/tty/serial/8250/8250_port.c:1806
serial8250_handle_irq.part.0+0x1e2/0x270
drivers/tty/serial/8250/8250_port.c:1879
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1865
[inline]
serial8250_default_handle_irq+0xc5/0x150
drivers/tty/serial/8250/8250_port.c:1895
serial8250_interrupt+0x102/0x1e0
drivers/tty/serial/8250/8250_core.c:125
__handle_irq_event_percpu+0x146/0x900 kernel/irq/handle.c:149
handle_irq_event_percpu+0x74/0x160 kernel/irq/handle.c:189
handle_irq_event+0xa7/0x134 kernel/irq/handle.c:206
handle_edge_irq+0x264/0x8e0 kernel/irq/chip.c:791
generic_handle_irq_desc include/linux/irqdesc.h:155 [inline]
handle_irq+0x252/0x3d8 arch/x86/kernel/irq_64.c:78
do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:246
ret_from_intr+0x0/0x1e
native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:57
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:552
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
start_secondary+0x404/0x5c0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (&port_lock_key){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
serial8250_console_write+0x7ed/0xa10
drivers/tty/serial/8250/8250_port.c:3247
univ8250_console_write+0x5f/0x70
drivers/tty/serial/8250/8250_core.c:590
call_console_drivers kernel/printk/printk.c:1729 [inline]
console_unlock+0xbe4/0x10c0 kernel/printk/printk.c:2410
vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927
vprintk_default+0x28/0x30 kernel/printk/printk.c:1968
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2001
register_console+0x787/0xb90 kernel/printk/printk.c:2725
univ8250_console_init+0x3e/0x4b
drivers/tty/serial/8250/8250_core.c:685
console_init+0x4f7/0x761 kernel/printk/printk.c:2811
start_kernel+0x59f/0x8c8 init/main.c:661
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #0 (console_owner){-.-.}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
console_lock_spinning_enable kernel/printk/printk.c:1592 [inline]
console_unlock+0x489/0x10c0 kernel/printk/printk.c:2407
vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927
vprintk_default+0x28/0x30 kernel/printk/printk.c:1968
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2001
show_pwq kernel/workqueue.c:4464 [inline]
show_workqueue_state.cold+0x9e4/0x11dc kernel/workqueue.c:4559
wq_watchdog_timer_fn+0x516/0x5a0 kernel/workqueue.c:5571
call_timer_fn+0x190/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1682 [inline]
__run_timers kernel/time/timer.c:1650 [inline]
run_timer_softirq+0xd03/0x1700 kernel/time/timer.c:1697
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
memory_is_nonzero mm/kasan/kasan.c:184 [inline]
memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
memory_is_poisoned mm/kasan/kasan.c:241 [inline]
check_memory_region_inline mm/kasan/kasan.c:257 [inline]
check_memory_region+0x104/0x190 mm/kasan/kasan.c:267
kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
rcu_dynticks_curr_cpu_in_eqs+0x51/0xb0 kernel/rcu/tree.c:350
rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:1025
rcu_read_lock+0x43/0x70 include/linux/rcupdate.h:630
lock_page_memcg+0x19/0x1d0 mm/memcontrol.c:1887
page_add_file_rmap+0x39/0xe70 mm/rmap.c:1184
alloc_set_pte+0x86c/0x1760 mm/memory.c:3489
filemap_map_pages+0xcf8/0x1130 mm/filemap.c:2677
do_fault_around mm/memory.c:3636 [inline]
do_read_fault mm/memory.c:3670 [inline]
do_fault mm/memory.c:3804 [inline]
handle_pte_fault mm/memory.c:4035 [inline]
__handle_mm_fault+0x3268/0x3f80 mm/memory.c:4159
handle_mm_fault+0x43f/0xb30 mm/memory.c:4196
__do_page_fault+0x62a/0xe90 arch/x86/mm/fault.c:1395
do_page_fault+0x71/0x581 arch/x86/mm/fault.c:1470
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1165
other info that might help us debug this:
Chain exists of:
console_owner --> &pool->lock/1 --> &(&pool->lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&pool->lock)->rlock);
lock(&pool->lock/1);
lock(&(&pool->lock)->rlock);
lock(console_owner);
*** DEADLOCK ***
8 locks held by syz-executor552/5042:
#0: 000000006b30c537 (&mm->mmap_sem){++++}, at:
__do_page_fault+0x3c9/0xe90 arch/x86/mm/fault.c:1324
#1: 000000006f357a81 (rcu_read_lock){....}, at:
filemap_map_pages+0x10c/0x1130 mm/filemap.c:2619
#2: 00000000d8be03e5 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: spin_lock
include/linux/spinlock.h:329 [inline]
#2: 00000000d8be03e5 (&(ptlock_ptr(page))->rlock#2){+.+.}, at:
pte_alloc_one_map mm/memory.c:3339 [inline]
#2: 00000000d8be03e5 (&(ptlock_ptr(page))->rlock#2){+.+.}, at:
alloc_set_pte+0xeda/0x1760 mm/memory.c:3468
#3: 000000006f357a81 (rcu_read_lock){....}, at: rcu_read_lock+0x0/0x70
include/linux/compiler.h:193
#4: 00000000fefda1b5 ((&wq_watchdog_timer)){+.-.}, at: lockdep_copy_map
include/linux/lockdep.h:168 [inline]
#4: 00000000fefda1b5 ((&wq_watchdog_timer)){+.-.}, at:
call_timer_fn+0xda/0x720 kernel/time/timer.c:1316
#5: 00000000ef1e4de1 (rcu_read_lock_sched){....}, at:
show_workqueue_state+0x0/0x120 kernel/workqueue.c:4429
#6: 00000000940f00d9 (&(&pool->lock)->rlock){-.-.}, at:
show_workqueue_state.cold+0x879/0x11dc kernel/workqueue.c:4557
#7: 0000000017d81d56 (console_lock){+.+.}, at: console_trylock_spinning
kernel/printk/printk.c:1654 [inline]
#7: 0000000017d81d56 (console_lock){+.+.}, at: vprintk_emit+0x21d/0x690
kernel/printk/printk.c:1926
stack backtrace:
CPU: 0 PID: 5042 Comm: syz-executor552 Not tainted 4.19.36 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1861 [inline]
check_prevs_add kernel/locking/lockdep.c:1974 [inline]
validate_chain kernel/locking/lockdep.c:2415 [inline]
__lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
console_lock_spinning_enable kernel/printk/printk.c:1592 [inline]
console_unlock+0x489/0x10c0 kernel/printk/printk.c:2407
vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927
vprintk_default+0x28/0x30 kernel/printk/printk.c:1968
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2001
show_pwq kernel/workqueue.c:4464 [inline]
show_workqueue_state.cold+0x9e4/0x11dc kernel/workqueue.c:4559
wq_watchdog_timer_fn+0x516/0x5a0 kernel/workqueue.c:5571
call_timer_fn+0x190/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1682 [inline]
__run_timers kernel/time/timer.c:1650 [inline]
run_timer_softirq+0xd03/0x1700 kernel/time/timer.c:1697
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
</IRQ>
RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline]
RIP: 0010:check_memory_region+0x104/0x190 mm/kasan/kasan.c:267
Code: 89 c8 4d 39 c8 74 10 41 80 38 00 74 ee 4b 8d 44 25 00 4d 85 c0 75 25
49 89 d9 49 29 c1 e9 70 ff ff ff 4d 85 c9 74 ba 4d 01 e1 <eb> 09 48 83 c0
01 4c 39 c8 74 ac 80 38 00 74 f2 eb a0 4c 89 c0 49
RSP: 0000:ffff8880969cf990 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: ffffed1015d04732 RBX: ffffed1015d04733 RCX: ffffffff8159a151
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae823990
RBP: ffff8880969cf9a8 R08: 1ffff11015d04732 R09: ffffed1015d04733
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: ffffed1015d04732
R13: 0000000089b5a025 R14: ffff8880a11808c0 R15: 0000000000000000
kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
rcu_dynticks_curr_cpu_in_eqs+0x51/0xb0 kernel/rcu/tree.c:350
rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:1025
rcu_read_lock+0x43/0x70 include/linux/rcupdate.h:630
lock_page_memcg+0x19/0x1d0 mm/memcontrol.c:1887
page_add_file_rmap+0x39/0xe70 mm/rmap.c:1184
alloc_set_pte+0x86c/0x1760 mm/memory.c:3489
filemap_map_pages+0xcf8/0x1130 mm/filemap.c:2677
do_fault_around mm/memory.c:3636 [inline]
do_read_fault mm/memory.c:3670 [inline]
do_fault mm/memory.c:3804 [inline]
handle_pte_fault mm/memory.c:4035 [inline]
__handle_mm_fault+0x3268/0x3f80 mm/memory.c:4159
handle_mm_fault+0x43f/0xb30 mm/memory.c:4196
__do_page_fault+0x62a/0xe90 arch/x86/mm/fault.c:1395
? trace_ha
Lost 13 message(s)!
workqueue events_power_efficient: flags=0x80
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
in-flight: 2648:gc_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
pending: do_cache_clean
workqueue mm_percpu_wq: flags=0x8
workqueue dm_bufio_cache: flags=0x8
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
pending: work_fn
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=164s workers=2 idle: 5
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: c98875d9 Linux 4.19.36
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=162de877200000
kernel config: https://syzkaller.appspot.com/x/.config?x=5e40ac5fbcc6366d
dashboard link: https://syzkaller.appspot.com/bug?extid=07af6c37cf925e122259
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14827e18a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143e2603200000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+07af6c...@syzkaller.appspotmail.com
BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 163s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256
in-flight: 14:rtc_timer_do_work
pending: vmstat_shepherd, cache_reap, check_corruption
======================================================
WARNING: possible circular locking dependency detected
4.19.36 #4 Not tainted
------------------------------------------------------
syz-executor552/5042 is trying to acquire lock:
000000005fe6f918 (console_owner){-.-.}, at: log_next
kernel/printk/printk.c:497 [inline]
000000005fe6f918 (console_owner){-.-.}, at: console_unlock+0x41f/0x10c0
kernel/printk/printk.c:2397
but task is already holding lock:
00000000940f00d9 (&(&pool->lock)->rlock){-.-.}, at:
show_workqueue_state.cold+0x879/0x11dc kernel/workqueue.c:4557
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&pool->lock)->rlock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
__queue_work+0x23d/0x10e0 kernel/workqueue.c:1417
queue_work_on+0x192/0x200 kernel/workqueue.c:1486
queue_work include/linux/workqueue.h:512 [inline]
schedule_work include/linux/workqueue.h:570 [inline]
put_pwq kernel/workqueue.c:1090 [inline]
put_pwq+0x178/0x1d0 kernel/workqueue.c:1075
put_pwq_unlocked.part.0+0x34/0x70 kernel/workqueue.c:1107
put_pwq_unlocked kernel/workqueue.c:1101 [inline]
destroy_workqueue+0x617/0x6f0 kernel/workqueue.c:4217
do_floppy_init drivers/block/floppy.c:4704 [inline]
floppy_async_init+0x202c/0x216b drivers/block/floppy.c:4721
async_run_entry_fn+0x126/0x570 kernel/async.c:127
process_one_work+0x98e/0x1760 kernel/workqueue.c:2153
worker_thread+0x98/0xe40 kernel/workqueue.c:2296
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
-> #3 (&pool->lock/1){..-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
__queue_work+0x23d/0x10e0 kernel/workqueue.c:1417
queue_work_on+0x192/0x200 kernel/workqueue.c:1486
queue_work include/linux/workqueue.h:512 [inline]
tty_schedule_flip drivers/tty/tty_buffer.c:408 [inline]
tty_flip_buffer_push+0xc5/0x100 drivers/tty/tty_buffer.c:551
pty_write+0x1a6/0x200 drivers/tty/pty.c:124
n_tty_write+0xb06/0x1100 drivers/tty/n_tty.c:2354
do_tty_write drivers/tty/tty_io.c:960 [inline]
tty_write+0x45b/0x7a0 drivers/tty/tty_io.c:1044
__vfs_write+0x116/0x820 fs/read_write.c:485
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0xea/0x1f0 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&(&port->lock)->rlock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
tty_port_tty_get+0x22/0x80 drivers/tty/tty_port.c:288
tty_port_default_wakeup+0x16/0x40 drivers/tty/tty_port.c:47
tty_port_tty_wakeup+0x5d/0x70 drivers/tty/tty_port.c:390
uart_write_wakeup+0x46/0x70 drivers/tty/serial/serial_core.c:103
serial8250_tx_chars+0x4a4/0xb20
drivers/tty/serial/8250/8250_port.c:1806
serial8250_handle_irq.part.0+0x1e2/0x270
drivers/tty/serial/8250/8250_port.c:1879
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1865
[inline]
serial8250_default_handle_irq+0xc5/0x150
drivers/tty/serial/8250/8250_port.c:1895
serial8250_interrupt+0x102/0x1e0
drivers/tty/serial/8250/8250_core.c:125
__handle_irq_event_percpu+0x146/0x900 kernel/irq/handle.c:149
handle_irq_event_percpu+0x74/0x160 kernel/irq/handle.c:189
handle_irq_event+0xa7/0x134 kernel/irq/handle.c:206
handle_edge_irq+0x264/0x8e0 kernel/irq/chip.c:791
generic_handle_irq_desc include/linux/irqdesc.h:155 [inline]
handle_irq+0x252/0x3d8 arch/x86/kernel/irq_64.c:78
do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:246
ret_from_intr+0x0/0x1e
native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:57
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:552
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
start_secondary+0x404/0x5c0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (&port_lock_key){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
serial8250_console_write+0x7ed/0xa10
drivers/tty/serial/8250/8250_port.c:3247
univ8250_console_write+0x5f/0x70
drivers/tty/serial/8250/8250_core.c:590
call_console_drivers kernel/printk/printk.c:1729 [inline]
console_unlock+0xbe4/0x10c0 kernel/printk/printk.c:2410
vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927
vprintk_default+0x28/0x30 kernel/printk/printk.c:1968
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2001
register_console+0x787/0xb90 kernel/printk/printk.c:2725
univ8250_console_init+0x3e/0x4b
drivers/tty/serial/8250/8250_core.c:685
console_init+0x4f7/0x761 kernel/printk/printk.c:2811
start_kernel+0x59f/0x8c8 init/main.c:661
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #0 (console_owner){-.-.}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
console_lock_spinning_enable kernel/printk/printk.c:1592 [inline]
console_unlock+0x489/0x10c0 kernel/printk/printk.c:2407
vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927
vprintk_default+0x28/0x30 kernel/printk/printk.c:1968
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2001
show_pwq kernel/workqueue.c:4464 [inline]
show_workqueue_state.cold+0x9e4/0x11dc kernel/workqueue.c:4559
wq_watchdog_timer_fn+0x516/0x5a0 kernel/workqueue.c:5571
call_timer_fn+0x190/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1682 [inline]
__run_timers kernel/time/timer.c:1650 [inline]
run_timer_softirq+0xd03/0x1700 kernel/time/timer.c:1697
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
memory_is_nonzero mm/kasan/kasan.c:184 [inline]
memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
memory_is_poisoned mm/kasan/kasan.c:241 [inline]
check_memory_region_inline mm/kasan/kasan.c:257 [inline]
check_memory_region+0x104/0x190 mm/kasan/kasan.c:267
kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
rcu_dynticks_curr_cpu_in_eqs+0x51/0xb0 kernel/rcu/tree.c:350
rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:1025
rcu_read_lock+0x43/0x70 include/linux/rcupdate.h:630
lock_page_memcg+0x19/0x1d0 mm/memcontrol.c:1887
page_add_file_rmap+0x39/0xe70 mm/rmap.c:1184
alloc_set_pte+0x86c/0x1760 mm/memory.c:3489
filemap_map_pages+0xcf8/0x1130 mm/filemap.c:2677
do_fault_around mm/memory.c:3636 [inline]
do_read_fault mm/memory.c:3670 [inline]
do_fault mm/memory.c:3804 [inline]
handle_pte_fault mm/memory.c:4035 [inline]
__handle_mm_fault+0x3268/0x3f80 mm/memory.c:4159
handle_mm_fault+0x43f/0xb30 mm/memory.c:4196
__do_page_fault+0x62a/0xe90 arch/x86/mm/fault.c:1395
do_page_fault+0x71/0x581 arch/x86/mm/fault.c:1470
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1165
other info that might help us debug this:
Chain exists of:
console_owner --> &pool->lock/1 --> &(&pool->lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&pool->lock)->rlock);
lock(&pool->lock/1);
lock(&(&pool->lock)->rlock);
lock(console_owner);
*** DEADLOCK ***
8 locks held by syz-executor552/5042:
#0: 000000006b30c537 (&mm->mmap_sem){++++}, at:
__do_page_fault+0x3c9/0xe90 arch/x86/mm/fault.c:1324
#1: 000000006f357a81 (rcu_read_lock){....}, at:
filemap_map_pages+0x10c/0x1130 mm/filemap.c:2619
#2: 00000000d8be03e5 (&(ptlock_ptr(page))->rlock#2){+.+.}, at: spin_lock
include/linux/spinlock.h:329 [inline]
#2: 00000000d8be03e5 (&(ptlock_ptr(page))->rlock#2){+.+.}, at:
pte_alloc_one_map mm/memory.c:3339 [inline]
#2: 00000000d8be03e5 (&(ptlock_ptr(page))->rlock#2){+.+.}, at:
alloc_set_pte+0xeda/0x1760 mm/memory.c:3468
#3: 000000006f357a81 (rcu_read_lock){....}, at: rcu_read_lock+0x0/0x70
include/linux/compiler.h:193
#4: 00000000fefda1b5 ((&wq_watchdog_timer)){+.-.}, at: lockdep_copy_map
include/linux/lockdep.h:168 [inline]
#4: 00000000fefda1b5 ((&wq_watchdog_timer)){+.-.}, at:
call_timer_fn+0xda/0x720 kernel/time/timer.c:1316
#5: 00000000ef1e4de1 (rcu_read_lock_sched){....}, at:
show_workqueue_state+0x0/0x120 kernel/workqueue.c:4429
#6: 00000000940f00d9 (&(&pool->lock)->rlock){-.-.}, at:
show_workqueue_state.cold+0x879/0x11dc kernel/workqueue.c:4557
#7: 0000000017d81d56 (console_lock){+.+.}, at: console_trylock_spinning
kernel/printk/printk.c:1654 [inline]
#7: 0000000017d81d56 (console_lock){+.+.}, at: vprintk_emit+0x21d/0x690
kernel/printk/printk.c:1926
stack backtrace:
CPU: 0 PID: 5042 Comm: syz-executor552 Not tainted 4.19.36 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1861 [inline]
check_prevs_add kernel/locking/lockdep.c:1974 [inline]
validate_chain kernel/locking/lockdep.c:2415 [inline]
__lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
console_lock_spinning_enable kernel/printk/printk.c:1592 [inline]
console_unlock+0x489/0x10c0 kernel/printk/printk.c:2407
vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927
vprintk_default+0x28/0x30 kernel/printk/printk.c:1968
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2001
show_pwq kernel/workqueue.c:4464 [inline]
show_workqueue_state.cold+0x9e4/0x11dc kernel/workqueue.c:4559
wq_watchdog_timer_fn+0x516/0x5a0 kernel/workqueue.c:5571
call_timer_fn+0x190/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1682 [inline]
__run_timers kernel/time/timer.c:1650 [inline]
run_timer_softirq+0xd03/0x1700 kernel/time/timer.c:1697
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
</IRQ>
RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:166 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline]
RIP: 0010:check_memory_region+0x104/0x190 mm/kasan/kasan.c:267
Code: 89 c8 4d 39 c8 74 10 41 80 38 00 74 ee 4b 8d 44 25 00 4d 85 c0 75 25
49 89 d9 49 29 c1 e9 70 ff ff ff 4d 85 c9 74 ba 4d 01 e1 <eb> 09 48 83 c0
01 4c 39 c8 74 ac 80 38 00 74 f2 eb a0 4c 89 c0 49
RSP: 0000:ffff8880969cf990 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: ffffed1015d04732 RBX: ffffed1015d04733 RCX: ffffffff8159a151
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae823990
RBP: ffff8880969cf9a8 R08: 1ffff11015d04732 R09: ffffed1015d04733
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: ffffed1015d04732
R13: 0000000089b5a025 R14: ffff8880a11808c0 R15: 0000000000000000
kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
rcu_dynticks_curr_cpu_in_eqs+0x51/0xb0 kernel/rcu/tree.c:350
rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:1025
rcu_read_lock+0x43/0x70 include/linux/rcupdate.h:630
lock_page_memcg+0x19/0x1d0 mm/memcontrol.c:1887
page_add_file_rmap+0x39/0xe70 mm/rmap.c:1184
alloc_set_pte+0x86c/0x1760 mm/memory.c:3489
filemap_map_pages+0xcf8/0x1130 mm/filemap.c:2677
do_fault_around mm/memory.c:3636 [inline]
do_read_fault mm/memory.c:3670 [inline]
do_fault mm/memory.c:3804 [inline]
handle_pte_fault mm/memory.c:4035 [inline]
__handle_mm_fault+0x3268/0x3f80 mm/memory.c:4159
handle_mm_fault+0x43f/0xb30 mm/memory.c:4196
__do_page_fault+0x62a/0xe90 arch/x86/mm/fault.c:1395
? trace_ha
Lost 13 message(s)!
workqueue events_power_efficient: flags=0x80
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
in-flight: 2648:gc_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
pending: do_cache_clean
workqueue mm_percpu_wq: flags=0x8
workqueue dm_bufio_cache: flags=0x8
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
pending: work_fn
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=164s workers=2 idle: 5
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot
Apr 29, 2019, 7:26:08 AM4/29/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: fa5941f4 Linux 4.14.114
syzbot found the following crash on:
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12d32f38a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7780000df8e070e
dashboard link: https://syzkaller.appspot.com/bug?extid=ca2bcb4480e72cbbaff8
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 142s!
INFO: task syz-executor.0:7001 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D24944 7001 6998 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
SYSC_clone kernel/fork.c:2168 [inline]
SyS_clone+0x37/0x50 kernel/fork.c:2162
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45737a
RSP: 002b:00007ffec150cf50 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffec150cf50 RCX: 000000000045737a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffec150cf90 R08: 0000000000000001 R09: 0000000000d53940
R10: 0000000000d53c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffec150cfe0
INFO: task syz-executor.5:7005 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D25232 7005 7000 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
SYSC_clone kernel/fork.c:2168 [inline]
SyS_clone+0x37/0x50 kernel/fork.c:2162
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45737a
RSP: 002b:00007ffccc3e9b10 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffccc3e9b10 RCX: 000000000045737a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffccc3e9b50 R08: 0000000000000001 R09: 00000000016f5940
R10: 00000000016f5c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffccc3e9ba0
INFO: task syz-executor.1:7006 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D24992 7006 6999 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
SYSC_clone kernel/fork.c:2168 [inline]
SyS_clone+0x37/0x50 kernel/fork.c:2162
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45737a
RSP: 002b:00007ffc1cfca180 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc1cfca180 RCX: 000000000045737a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc1cfca1c0 R08: 0000000000000001 R09: 00000000028f8940
R10: 00000000028f8c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc1cfca210
INFO: task syz-executor.2:7007 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D24992 7007 7002 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
SYSC_clone kernel/fork.c:2168 [inline]
SyS_clone+0x37/0x50 kernel/fork.c:2162
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45737a
RSP: 002b:00007ffed031c600 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffed031c600 RCX: 000000000045737a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffed031c640 R08: 0000000000000001 R09: 00000000024a9940
R10: 00000000024a9c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffed031c690
INFO: task syz-executor.1:8138 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D27520 8138 7006 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
wb_wait_for_completion fs/fs-writeback.c:221 [inline]
wb_wait_for_completion+0x133/0x190 fs/fs-writeback.c:217
sync_inodes_sb+0x170/0x9b0 fs/fs-writeback.c:2447
sync_inodes_one_sb+0x48/0x60 fs/sync.c:74
iterate_supers+0x133/0x250 fs/super.c:613
sys_sync+0x7a/0x130 fs/sync.c:113
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x200001ca
RSP: 002b:00007f9573d27bd8 EFLAGS: 00000a83 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00000000200001ca
RDX: 88b8b086124f4ca8 RSI: 0000000000000000 RDI: 0000000000400300
RBP: 00000000000000eb R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000a83 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
INFO: task syz-executor.2:8324 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D28760 8324 8294 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
sys_fork+0x1f/0x30 kernel/fork.c:2128
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x20000911
RSP: 002b:00007fc31be71bd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000039
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000911
RDX: 5bb50b0134176bba RSI: 0000000000000000 RDI: 00007fc31be72608
RBP: 00000000000000f6 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000216 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
INFO: task syz-executor.2:8344 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29520 8344 8304 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
sys_fork+0x1f/0x30 kernel/fork.c:2128
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x20000911
RSP: 002b:00007fc31be71bd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000039
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000911
RDX: 5bb50b0134176bba RSI: 0000000000000000 RDI: 00007fc31be72608
RBP: 00000000000000f6 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000216 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
INFO: task syz-executor.2:8350 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29520 8350 8295 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
sys_fork+0x1f/0x30 kernel/fork.c:2128
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x20000911
RSP: 002b:00007fc31be71bd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000039
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000911
RDX: 5bb50b0134176bba RSI: 0000000000000000 RDI: 00007fc31be72608
RBP: 00000000000000f6 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000216 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
INFO: task syz-executor.2:8352 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29248 8352 8301 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
sys_fork+0x1f/0x30 kernel/fork.c:2128
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x20000911
RSP: 002b:00007fc31be71bd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000039
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000911
RDX: 5bb50b0134176bba RSI: 0000000000000000 RDI: 00007fc31be72608
RBP: 00000000000000f6 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000216 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
INFO: task syz-executor.2:8355 blocked for more than 140 seconds.
Not tainted 4.14.114 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29520 8355 8309 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2807 [inline]
__schedule+0x7be/0x1cf0 kernel/sched/core.c:3383
schedule+0x92/0x1c0 kernel/sched/core.c:3427
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:572 [inline]
rwsem_down_write_failed+0x5cd/0xbe0 kernel/locking/rwsem-xadd.c:601
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
i_mmap_lock_write include/linux/fs.h:470 [inline]
dup_mmap kernel/fork.c:681 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1253 [inline]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
copy_process kernel/fork.c:1570 [inline]
_do_fork+0x19e/0xce0 kernel/fork.c:2058
sys_fork+0x1f/0x30 kernel/fork.c:2128
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x20000911
RSP: 002b:00007fc31be71bd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000039
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000911
RDX: 5bb50b0134176bba RSI: 0000000000000000 RDI: 00007fc31be72608
RBP: 00000000000000f6 R08: 0000000000000005 R09: 0000000000000006
R10: 0000000000000007 R11: 0000000000000216 R12: 000000000000000b
R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1008:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81487148>]
debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4541
5 locks held by kworker/u4:4/2279:
#0: ("writeback"){+.+.}, at: [<ffffffff813d130e>] work_static
include/linux/workqueue.h:199 [inline]
#0: ("writeback"){+.+.}, at: [<ffffffff813d130e>] set_work_data
kernel/workqueue.c:619 [inline]
#0: ("writeback"){+.+.}, at: [<ffffffff813d130e>]
set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("writeback"){+.+.}, at: [<ffffffff813d130e>]
process_one_work+0x76e/0x1610 kernel/workqueue.c:2085
#1: ((&(&wb->dwork)->work)){+.+.}, at: [<ffffffff813d134b>]
process_one_work+0x7ab/0x1610 kernel/workqueue.c:2089
#2: (&sbi->s_journal_flag_rwsem){.+.+}, at: [<ffffffff81739b32>]
do_writepages+0xd2/0x250 mm/page-writeback.c:2364
#3: (&ei->i_data_sem){++++}, at: [<ffffffff81c1effb>]
ext4_map_blocks+0x77b/0x16e0 fs/ext4/inode.c:628
#4: (pcpu_drain_mutex){+.+.}, at: [<ffffffff817217ad>]
drain_all_pages+0x4d/0x570 mm/page_alloc.c:2493
3 locks held by rs:main Q:Reg/6834:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff81942e9b>]
__fdget_pos+0xab/0xd0 fs/file.c:769
#1: (sb_writers#4){.+.+}, at: [<ffffffff818d9cff>] file_start_write
include/linux/fs.h:2702 [inline]
#1: (sb_writers#4){.+.+}, at: [<ffffffff818d9cff>] vfs_write+0x3af/0x500
fs/read_write.c:543
#2: (&sb->s_type->i_mutex_key#9){+.+.}, at: [<ffffffff81bf1fb5>]
inode_trylock include/linux/fs.h:735 [inline]
#2: (&sb->s_type->i_mutex_key#9){+.+.}, at: [<ffffffff81bf1fb5>]
ext4_file_write_iter+0x205/0xfd0 fs/ext4/file.c:230
2 locks held by getty/6959:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6960:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6961:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6962:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6963:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6964:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/6965:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff861af743>]
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8310d3c6>]
n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
1 lock held by syz-fuzzer/6996:
#0: (sk_lock-AF_INET){+.+.}, at: [<ffffffff8522cbe2>] lock_sock
include/net/sock.h:1462 [inline]
#0: (sk_lock-AF_INET){+.+.}, at: [<ffffffff8522cbe2>]
tcp_sendmsg+0x22/0x50 net/ipv4/tcp.c:1445
1 lock held by syz-executor.0/6998:
#0: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff817ded16>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#0: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff817ded16>]
unlink_file_vma+0x76/0xb0 mm/mmap.c:158
4 locks held by syz-executor.0/7001:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mmap
kernel/fork.c:681 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mm
kernel/fork.c:1199 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] copy_mm
kernel/fork.c:1253 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
1 lock held by syz-executor.2/7002:
#0: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff817ded16>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#0: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff817ded16>]
unlink_file_vma+0x76/0xb0 mm/mmap.c:158
1 lock held by syz-executor.3/7003:
#0: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff817ded16>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#0: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff817ded16>]
unlink_file_vma+0x76/0xb0 mm/mmap.c:158
4 locks held by syz-executor.5/7005:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mmap
kernel/fork.c:681 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mm
kernel/fork.c:1199 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] copy_mm
kernel/fork.c:1253 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
4 locks held by syz-executor.1/7006:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mmap
kernel/fork.c:681 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mm
kernel/fork.c:1199 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] copy_mm
kernel/fork.c:1253 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
4 locks held by syz-executor.2/7007:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
i_mmap_lock_write include/linux/fs.h:470 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mmap
kernel/fork.c:681 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] dup_mm
kernel/fork.c:1199 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>] copy_mm
kernel/fork.c:1253 [inline]
#3: (&mapping->i_mmap_rwsem){++++}, at: [<ffffffff81370717>]
copy_process.part.0+0x4147/0x6950 kernel/fork.c:1755
1 lock held by udevd/7131:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff8129896a>]
__do_page_fault+0x2ca/0xb80 arch/x86/mm/fault.c:1354
1 lock held by udevd/7142:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff8129896a>]
__do_page_fault+0x2ca/0xb80 arch/x86/mm/fault.c:1354
2 locks held by syz-executor.1/8138:
#0: (&type->s_umount_key#45){++++}, at: [<ffffffff818e13b1>]
iterate_supers+0xe1/0x250 fs/super.c:611
#1: (&bdi->wb_switch_rwsem){+.+.}, at: [<ffffffff81976cb0>]
bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:336 [inline]
#1: (&bdi->wb_switch_rwsem){+.+.}, at: [<ffffffff81976cb0>]
sync_inodes_sb+0x150/0x9b0 fs/fs-writeback.c:2445
3 locks held by syz-executor.2/8281:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8282:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8288:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8289:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8290:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8291:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8292:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8293:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
4 locks held by syz-executor.2/8294:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
#3: (&anon_vma->rwsem){++++}, at: [<ffffffff817fe233>] lock_anon_vma_root
mm/rmap.c:238 [inline]
#3: (&anon_vma->rwsem){++++}, at: [<ffffffff817fe233>]
anon_vma_clone+0x143/0x470 mm/rmap.c:278
3 locks held by syz-executor.2/8295:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8296:
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mmap
kernel/fork.c:606 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] dup_mm
kernel/fork.c:1199 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>] copy_mm
kernel/fork.c:1253 [inline]
#0: (&dup_mmap_sem){.+.+}, at: [<ffffffff8137027f>]
copy_process.part.0+0x3caf/0x6950 kernel/fork.c:1755
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mmap
kernel/fork.c:607 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] dup_mm
kernel/fork.c:1199 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>] copy_mm
kernel/fork.c:1253 [inline]
#1: (&mm->mmap_sem){++++}, at: [<ffffffff8137029b>]
copy_process.part.0+0x3ccb/0x6950 kernel/fork.c:1755
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mmap
kernel/fork.c:616 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] dup_mm
kernel/fork.c:1199 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>] copy_mm
kernel/fork.c:1253 [inline]
#2: (&mm->mmap_sem/1){+.+.}, at: [<ffffffff813702d5>]
copy_process.part.0+0x3d05/0x6950 kernel/fork.c:1755
3 locks held by syz-executor.2/8297:
syzbot
Mar 1, 2020, 10:08:13 AM3/1/20
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 78d697fc Linux 4.14.172
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=101c0a2de00000
kernel config: https://syzkaller.appspot.com/x/.config?x=31ad682bcda9b93f
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=138852c3e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ca2bcb...@syzkaller.appspotmail.com
audit: type=1400 audit(1583074963.576:36): avc: denied { map } for pid=7392 comm="syz-executor572" path="/root/syz-executor572389225" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 146s!
in-flight: 2759:rtc_timer_do_work
pending: cache_reap
======================================================
WARNING: possible circular locking dependency detected
4.14.172-syzkaller #0 Not tainted
------------------------------------------------------
swapper/0/0 is trying to acquire lock:
(console_owner){-.-.}, at: [<ffffffff8148d4cc>] log_next kernel/printk/printk.c:493 [inline]
(console_owner){-.-.}, at: [<ffffffff8148d4cc>] console_unlock+0x36c/0xec0 kernel/printk/printk.c:2384
but task is already holding lock:
(&(&pool->lock)->rlock){-.-.}, at: [<ffffffff813bf9c0>] show_workqueue_state.cold+0x706/0xedd kernel/workqueue.c:4517
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&pool->lock)->rlock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x1ba/0xf10 kernel/workqueue.c:1419
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1488
queue_work include/linux/workqueue.h:491 [inline]
schedule_work include/linux/workqueue.h:549 [inline]
put_pwq kernel/workqueue.c:1092 [inline]
put_pwq+0x129/0x180 kernel/workqueue.c:1077
put_pwq_unlocked.part.0+0x30/0x70 kernel/workqueue.c:1109
put_pwq_unlocked kernel/workqueue.c:1103 [inline]
destroy_workqueue+0x570/0x660 kernel/workqueue.c:4171
do_floppy_init drivers/block/floppy.c:4732 [inline]
floppy_async_init+0x1abb/0x1c06 drivers/block/floppy.c:4749
async_run_entry_fn+0x102/0x4c0 kernel/async.c:127
process_one_work+0x813/0x1540 kernel/workqueue.c:2114
worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #3 (&pool->lock/1){..-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x1ba/0xf10 kernel/workqueue.c:1419
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1488
pty_write+0x173/0x1c0 drivers/tty/pty.c:125
n_tty_write+0x8dd/0xe30 drivers/tty/n_tty.c:2356
do_tty_write drivers/tty/tty_io.c:959 [inline]
tty_write+0x3f0/0x700 drivers/tty/tty_io.c:1043
__vfs_write+0xe4/0x630 fs/read_write.c:480
vfs_write+0x192/0x4e0 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xf2/0x210 fs/read_write.c:582
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #2 (&(&port->lock)->rlock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:160
tty_port_tty_get+0x1d/0x80 drivers/tty/tty_port.c:288
tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:46
serial8250_tx_chars+0x400/0x9e0 drivers/tty/serial/8250/8250_port.c:1810
serial8250_handle_irq.part.0+0x1f8/0x240 drivers/tty/serial/8250/8250_port.c:1883
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1869 [inline]
serial8250_default_handle_irq+0x96/0x110 drivers/tty/serial/8250/8250_port.c:1899
serial8250_interrupt+0xe4/0x1a0 drivers/tty/serial/8250/8250_core.c:129
__handle_irq_event_percpu+0x125/0x7e0 kernel/irq/handle.c:147
handle_irq_event_percpu+0x66/0x120 kernel/irq/handle.c:187
handle_irq_event+0xa2/0x12d kernel/irq/handle.c:204
handle_edge_irq+0x215/0x810 kernel/irq/chip.c:770
generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87
do_IRQ+0x93/0x1d0 arch/x86/kernel/irq.c:230
ret_from_intr+0x0/0x1e
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x659/0x676 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #1 (&port_lock_key){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:160
serial8250_console_write+0x6c1/0x8e0 drivers/tty/serial/8250/8250_port.c:3236
call_console_drivers kernel/printk/printk.c:1725 [inline]
console_unlock+0x9b2/0xec0 kernel/printk/printk.c:2397
vprintk_emit kernel/printk/printk.c:1923 [inline]
vprintk_emit+0x1f8/0x600 kernel/printk/printk.c:1888
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
register_console+0x5ec/0x9a0 kernel/printk/printk.c:2716
univ8250_console_init+0x2f/0x3a drivers/tty/serial/8250/8250_core.c:691
console_init+0x46/0x53 kernel/printk/printk.c:2797
start_kernel+0x437/0x676 init/main.c:634
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #0 (console_owner){-.-.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994
console_lock_spinning_enable kernel/printk/printk.c:1588 [inline]
console_unlock+0x3d4/0xec0 kernel/printk/printk.c:2394
vprintk_emit kernel/printk/printk.c:1923 [inline]
vprintk_emit+0x1f8/0x600 kernel/printk/printk.c:1888
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
show_pwq kernel/workqueue.c:4423 [inline]
show_workqueue_state.cold+0x849/0xedd kernel/workqueue.c:4519
wq_watchdog_timer_fn+0x3d0/0x440 kernel/workqueue.c:5503
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0xac2/0x1390 kernel/time/timer.c:1651
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x659/0x676 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
other info that might help us debug this:
Chain exists of:
console_owner --> &pool->lock/1 --> &(&pool->lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&pool->lock)->rlock);
lock(&pool->lock/1);
lock(&(&pool->lock)->rlock);
lock(console_owner);
*** DEADLOCK ***
4 locks held by swapper/0/0:
#0: (kernel/workqueue.c:5441){+.-.}, at: [<ffffffff814d49b8>] lockdep_copy_map include/linux/lockdep.h:174 [inline]
#0: (kernel/workqueue.c:5441){+.-.}, at: [<ffffffff814d49b8>] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1269
#1: (rcu_read_lock_sched){....}, at: [<ffffffff813bb780>] show_workqueue_state+0x0/0xf0 kernel/workqueue.c:4359
#2: (&(&pool->lock)->rlock){-.-.}, at: [<ffffffff813bf9c0>] show_workqueue_state.cold+0x706/0xedd kernel/workqueue.c:4517
#3: (console_lock){+.+.}, at: [<ffffffff8148e20a>] console_trylock_spinning kernel/printk/printk.c:1650 [inline]
#3: (console_lock){+.+.}, at: [<ffffffff8148e20a>] vprintk_emit kernel/printk/printk.c:1922 [inline]
#3: (console_lock){+.+.}, at: [<ffffffff8148e20a>] vprintk_emit+0x1ea/0x600 kernel/printk/printk.c:1888
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.172-syzkaller #0
dump_stack+0x13e/0x194 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x1c4/0x282 kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994
console_lock_spinning_enable kernel/printk/printk.c:1588 [inline]
console_unlock+0x3d4/0xec0 kernel/printk/printk.c:2394
vprintk_emit kernel/printk/printk.c:1923 [inline]
vprintk_emit+0x1f8/0x600 kernel/printk/printk.c:1888
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
show_pwq kernel/workqueue.c:4423 [inline]
show_workqueue_state.cold+0x849/0xedd kernel/workqueue.c:4519
wq_watchdog_timer_fn+0x3d0/0x440 kernel/workqueue.c:5503
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0xac2/0x1390 kernel/time/timer.c:1651
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffffffff87c07e78 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2ce4 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff87c76abc
RBP: ffffffff87d16710 R08: 1ffffffff1124101 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff0f8ec48
R13: ffffffff87c76240 R14: 0000000000000000 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x659/0x676 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
workqueue events_power_efficient: flags=0x80
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
pending: fb_flashcursor, neigh_periodic_work
workqueue mm_percpu_wq: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
workqueue dm_bufio_cache: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: work_fn
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=147s workers=2 idle: 18
HEAD commit: 78d697fc Linux 4.14.172
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=101c0a2de00000
kernel config: https://syzkaller.appspot.com/x/.config?x=31ad682bcda9b93f
dashboard link: https://syzkaller.appspot.com/bug?extid=ca2bcb4480e72cbbaff8
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e0ac55e00000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=138852c3e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ca2bcb...@syzkaller.appspotmail.com
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 146s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
workqueue events: flags=0x0
in-flight: 2759:rtc_timer_do_work
pending: cache_reap
======================================================
WARNING: possible circular locking dependency detected
------------------------------------------------------
swapper/0/0 is trying to acquire lock:
(console_owner){-.-.}, at: [<ffffffff8148d4cc>] log_next kernel/printk/printk.c:493 [inline]
(console_owner){-.-.}, at: [<ffffffff8148d4cc>] console_unlock+0x36c/0xec0 kernel/printk/printk.c:2384
but task is already holding lock:
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&pool->lock)->rlock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x1ba/0xf10 kernel/workqueue.c:1419
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1488
queue_work include/linux/workqueue.h:491 [inline]
schedule_work include/linux/workqueue.h:549 [inline]
put_pwq kernel/workqueue.c:1092 [inline]
put_pwq+0x129/0x180 kernel/workqueue.c:1077
put_pwq_unlocked.part.0+0x30/0x70 kernel/workqueue.c:1109
put_pwq_unlocked kernel/workqueue.c:1103 [inline]
destroy_workqueue+0x570/0x660 kernel/workqueue.c:4171
do_floppy_init drivers/block/floppy.c:4732 [inline]
floppy_async_init+0x1abb/0x1c06 drivers/block/floppy.c:4749
async_run_entry_fn+0x102/0x4c0 kernel/async.c:127
process_one_work+0x813/0x1540 kernel/workqueue.c:2114
worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #3 (&pool->lock/1){..-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x1ba/0xf10 kernel/workqueue.c:1419
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1488
pty_write+0x173/0x1c0 drivers/tty/pty.c:125
n_tty_write+0x8dd/0xe30 drivers/tty/n_tty.c:2356
do_tty_write drivers/tty/tty_io.c:959 [inline]
tty_write+0x3f0/0x700 drivers/tty/tty_io.c:1043
__vfs_write+0xe4/0x630 fs/read_write.c:480
vfs_write+0x192/0x4e0 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xf2/0x210 fs/read_write.c:582
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #2 (&(&port->lock)->rlock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
tty_port_tty_get+0x1d/0x80 drivers/tty/tty_port.c:288
tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:46
serial8250_tx_chars+0x400/0x9e0 drivers/tty/serial/8250/8250_port.c:1810
serial8250_handle_irq.part.0+0x1f8/0x240 drivers/tty/serial/8250/8250_port.c:1883
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1869 [inline]
serial8250_default_handle_irq+0x96/0x110 drivers/tty/serial/8250/8250_port.c:1899
serial8250_interrupt+0xe4/0x1a0 drivers/tty/serial/8250/8250_core.c:129
__handle_irq_event_percpu+0x125/0x7e0 kernel/irq/handle.c:147
handle_irq_event_percpu+0x66/0x120 kernel/irq/handle.c:187
handle_irq_event+0xa2/0x12d kernel/irq/handle.c:204
handle_edge_irq+0x215/0x810 kernel/irq/chip.c:770
generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87
do_IRQ+0x93/0x1d0 arch/x86/kernel/irq.c:230
ret_from_intr+0x0/0x1e
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x659/0x676 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #1 (&port_lock_key){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
serial8250_console_write+0x6c1/0x8e0 drivers/tty/serial/8250/8250_port.c:3236
call_console_drivers kernel/printk/printk.c:1725 [inline]
console_unlock+0x9b2/0xec0 kernel/printk/printk.c:2397
vprintk_emit kernel/printk/printk.c:1923 [inline]
vprintk_emit+0x1f8/0x600 kernel/printk/printk.c:1888
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
register_console+0x5ec/0x9a0 kernel/printk/printk.c:2716
univ8250_console_init+0x2f/0x3a drivers/tty/serial/8250/8250_core.c:691
console_init+0x46/0x53 kernel/printk/printk.c:2797
start_kernel+0x437/0x676 init/main.c:634
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #0 (console_owner){-.-.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994
console_lock_spinning_enable kernel/printk/printk.c:1588 [inline]
console_unlock+0x3d4/0xec0 kernel/printk/printk.c:2394
vprintk_emit kernel/printk/printk.c:1923 [inline]
vprintk_emit+0x1f8/0x600 kernel/printk/printk.c:1888
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
show_pwq kernel/workqueue.c:4423 [inline]
show_workqueue_state.cold+0x849/0xedd kernel/workqueue.c:4519
wq_watchdog_timer_fn+0x3d0/0x440 kernel/workqueue.c:5503
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0xac2/0x1390 kernel/time/timer.c:1651
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x659/0x676 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
other info that might help us debug this:
Chain exists of:
console_owner --> &pool->lock/1 --> &(&pool->lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&pool->lock)->rlock);
lock(&pool->lock/1);
lock(&(&pool->lock)->rlock);
lock(console_owner);
*** DEADLOCK ***
#0: (kernel/workqueue.c:5441){+.-.}, at: [<ffffffff814d49b8>] lockdep_copy_map include/linux/lockdep.h:174 [inline]
#0: (kernel/workqueue.c:5441){+.-.}, at: [<ffffffff814d49b8>] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1269
#1: (rcu_read_lock_sched){....}, at: [<ffffffff813bb780>] show_workqueue_state+0x0/0xf0 kernel/workqueue.c:4359
#2: (&(&pool->lock)->rlock){-.-.}, at: [<ffffffff813bf9c0>] show_workqueue_state.cold+0x706/0xedd kernel/workqueue.c:4517
#3: (console_lock){+.+.}, at: [<ffffffff8148e20a>] console_trylock_spinning kernel/printk/printk.c:1650 [inline]
#3: (console_lock){+.+.}, at: [<ffffffff8148e20a>] vprintk_emit kernel/printk/printk.c:1922 [inline]
#3: (console_lock){+.+.}, at: [<ffffffff8148e20a>] vprintk_emit+0x1ea/0x600 kernel/printk/printk.c:1888
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:17 [inline]
Call Trace:
<IRQ>
dump_stack+0x13e/0x194 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x1c4/0x282 kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994
console_lock_spinning_enable kernel/printk/printk.c:1588 [inline]
console_unlock+0x3d4/0xec0 kernel/printk/printk.c:2394
vprintk_emit kernel/printk/printk.c:1923 [inline]
vprintk_emit+0x1f8/0x600 kernel/printk/printk.c:1888
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
show_pwq kernel/workqueue.c:4423 [inline]
show_workqueue_state.cold+0x849/0xedd kernel/workqueue.c:4519
wq_watchdog_timer_fn+0x3d0/0x440 kernel/workqueue.c:5503
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0xac2/0x1390 kernel/time/timer.c:1651
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
</IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffffffff87c07e78 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2ce4 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff87c76abc
RBP: ffffffff87d16710 R08: 1ffffffff1124101 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff0f8ec48
R13: ffffffff87c76240 R14: 0000000000000000 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x659/0x676 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
workqueue events_power_efficient: flags=0x80
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
pending: fb_flashcursor, neigh_periodic_work
workqueue mm_percpu_wq: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
workqueue dm_bufio_cache: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: work_fn
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=147s workers=2 idle: 18
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