possible deadlock in send_sigio
12 views
Skip to first unread message
syzbot
Apr 29, 2020, 10:08:14 AM4/29/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 050272a0 Linux 4.14.177
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=104b4a40100000
kernel config: https://syzkaller.appspot.com/x/.config?x=b24dc669afb42f8b
dashboard link: https://syzkaller.appspot.com/bug?extid=2bbbe6fb0f290cd2876d
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:
Reported-by: syzbot+2bbbe6...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
4.14.177-syzkaller #0 Not tainted
------------------------------------------------------
rcu_preempt/8 is trying to acquire lock:
(tasklist_lock){.?.+}, at: [<ffffffff818f2521>] send_sigio+0xa1/0x1d0 fs/fcntl.c:790
but task is already holding lock:
(&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync_rcu fs/fcntl.c:990 [inline]
(&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync fs/fcntl.c:1011 [inline]
(&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&new->fa_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
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync fs/fcntl.c:1011 [inline]
kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004
tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49
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
arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
del_timer_sync+0x116/0x250 kernel/time/timer.c:1237
schedule_timeout+0x444/0xe40 kernel/time/timer.c:1747
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #3 (&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
-> #2 (console_owner){-.-.}:
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
fail_dump lib/fault-inject.c:44 [inline]
should_fail.cold+0xdf/0x14b lib/fault-inject.c:149
should_failslab+0xd6/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc mm/slab.c:3376 [inline]
kmem_cache_alloc+0x44/0x770 mm/slab.c:3550
__sigqueue_alloc+0x1b8/0x3e0 kernel/signal.c:400
__send_signal+0x194/0x1280 kernel/signal.c:1097
specific_send_sig_info kernel/signal.c:1208 [inline]
force_sig_info+0x240/0x340 kernel/signal.c:1260
force_sig_info_fault.constprop.0+0x185/0x260 arch/x86/mm/fault.c:225
__bad_area_nosemaphore+0x1d9/0x2a0 arch/x86/mm/fault.c:940
__do_page_fault+0x859/0xb40 arch/x86/mm/fault.c:1412
page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1122
-> #1 (&(&sighand->siglock)->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]
copy_process.part.0+0x2e5c/0x6a50 kernel/fork.c:1876
copy_process kernel/fork.c:1586 [inline]
_do_fork+0x180/0xc80 kernel/fork.c:2070
kernel_thread+0x2f/0x40 kernel/fork.c:2132
create_kthread kernel/kthread.c:255 [inline]
kthreadd+0x4f8/0x6f0 kernel/kthread.c:567
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
-> #0 (tasklist_lock){.?.+}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x2d/0x40 kernel/locking/spinlock.c:224
send_sigio+0xa1/0x1d0 fs/fcntl.c:790
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync fs/fcntl.c:1011 [inline]
kill_fasync+0x1be/0x3c0 fs/fcntl.c:1004
tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49
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
arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
del_timer_sync+0x116/0x250 kernel/time/timer.c:1237
schedule_timeout+0x444/0xe40 kernel/time/timer.c:1747
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
other info that might help us debug this:
Chain exists of:
tasklist_lock --> &port_lock_key --> &(&new->fa_lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&new->fa_lock)->rlock);
lock(&port_lock_key);
lock(&(&new->fa_lock)->rlock);
lock(tasklist_lock);
*** DEADLOCK ***
6 locks held by rcu_preempt/8:
#0: (&(&i->lock)->rlock){-.-.}, at: [<ffffffff8341007b>] spin_lock include/linux/spinlock.h:317 [inline]
#0: (&(&i->lock)->rlock){-.-.}, at: [<ffffffff8341007b>] serial8250_interrupt+0x2b/0x1a0 drivers/tty/serial/8250/8250_core.c:119
#1: (&port_lock_key){-.-.}, at: [<ffffffff83420870>] serial8250_handle_irq.part.0+0x20/0x240 drivers/tty/serial/8250/8250_port.c:1872
#2: (&tty->ldisc_sem){++++}, at: [<ffffffff833b058b>] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305
#3: (rcu_read_lock){....}, at: [<ffffffff818f268d>] kill_fasync+0x3d/0x3c0 fs/fcntl.c:1009
#4: (&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync_rcu fs/fcntl.c:990 [inline]
#4: (&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync fs/fcntl.c:1011 [inline]
#4: (&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004
#5: (&f->f_owner.lock){.?.?}, at: [<ffffffff818f24a4>] send_sigio+0x24/0x1d0 fs/fcntl.c:778
stack backtrace:
CPU: 0 PID: 8 Comm: rcu_preempt Not tainted 4.14.177-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]
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:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x2d/0x40 kernel/locking/spinlock.c:224
send_sigio+0xa1/0x1d0 fs/fcntl.c:790
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync fs/fcntl.c:1011 [inline]
kill_fasync+0x1be/0x3c0 fs/fcntl.c:1004
tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49
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
common_interrupt+0x8f/0x8f arch/x86/entry/entry_64.S:576
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:del_timer_sync+0x116/0x250 kernel/time/timer.c:1237
RSP: 0018:ffff8880a9867c28 EFLAGS: 00000297 ORIG_RAX: ffffffffffffffc8
RAX: ffff8880a9854200 RBX: ffff8880a9867cd0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000297
RBP: 0000000000000297 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a9867d00
R13: ffff8880aea239c0 R14: ffff8880aea239c0 R15: ffff8880a9867cd0
schedule_timeout+0x444/0xe40 kernel/time/timer.c:1747
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
CPU: 1 PID: 16082 Comm: syz-executor.3 Not tainted 4.14.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0x10a/0x14b lib/fault-inject.c:149
should_failslab+0xd6/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc_node mm/slab.c:3297 [inline]
kmem_cache_alloc_node_trace+0x292/0x7b0 mm/slab.c:3659
__do_kmalloc_node mm/slab.c:3681 [inline]
__kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
__kmalloc_reserve.isra.0+0x35/0xd0 net/core/skbuff.c:137
__alloc_skb+0xca/0x4c0 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:980 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1159 [inline]
netlink_sendmsg+0x7de/0xbe0 net/netlink/af_netlink.c:1853
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x70a/0x840 net/socket.c:2062
__sys_sendmsg+0xa3/0x120 net/socket.c:2096
SYSC_sendmsg net/socket.c:2107 [inline]
SyS_sendmsg+0x27/0x40 net/socket.c:2103
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007f0a158a6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004fdcc0 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000009
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000b
R13: 0000000000000948 R14: 00000000004d59c0 R15: 00007f0a158a76d4
netlink: 2 bytes leftover after parsing attributes in process `syz-executor.3'.
hfs: unable to parse mount options
hfs: unable to parse mount options
cifs_vfs_err: 27 callbacks suppressed
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
CIFS VFS: Malformed UNC in devname.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
CIFS VFS: Malformed UNC in devname.
cifs_vfs_err: 4 callbacks suppressed
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
Unknown ioctl -1068978587
CIFS VFS: Malformed UNC in devname.
Unknown ioctl -1068978587
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
---
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 found the following crash on:
HEAD commit: 050272a0 Linux 4.14.177
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=104b4a40100000
kernel config: https://syzkaller.appspot.com/x/.config?x=b24dc669afb42f8b
dashboard link: https://syzkaller.appspot.com/bug?extid=2bbbe6fb0f290cd2876d
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:
Reported-by: syzbot+2bbbe6...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
4.14.177-syzkaller #0 Not tainted
------------------------------------------------------
rcu_preempt/8 is trying to acquire lock:
(tasklist_lock){.?.+}, at: [<ffffffff818f2521>] send_sigio+0xa1/0x1d0 fs/fcntl.c:790
but task is already holding lock:
(&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync_rcu fs/fcntl.c:990 [inline]
(&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync fs/fcntl.c:1011 [inline]
(&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&new->fa_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
kill_fasync_rcu fs/fcntl.c:990 [inline]
kill_fasync fs/fcntl.c:1011 [inline]
kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004
tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49
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
arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
del_timer_sync+0x116/0x250 kernel/time/timer.c:1237
schedule_timeout+0x444/0xe40 kernel/time/timer.c:1747
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #3 (&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
-> #2 (console_owner){-.-.}:
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
fail_dump lib/fault-inject.c:44 [inline]
should_fail.cold+0xdf/0x14b lib/fault-inject.c:149
should_failslab+0xd6/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc mm/slab.c:3376 [inline]
kmem_cache_alloc+0x44/0x770 mm/slab.c:3550
__sigqueue_alloc+0x1b8/0x3e0 kernel/signal.c:400
__send_signal+0x194/0x1280 kernel/signal.c:1097
specific_send_sig_info kernel/signal.c:1208 [inline]
force_sig_info+0x240/0x340 kernel/signal.c:1260
force_sig_info_fault.constprop.0+0x185/0x260 arch/x86/mm/fault.c:225
__bad_area_nosemaphore+0x1d9/0x2a0 arch/x86/mm/fault.c:940
__do_page_fault+0x859/0xb40 arch/x86/mm/fault.c:1412
page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1122
-> #1 (&(&sighand->siglock)->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]
copy_process.part.0+0x2e5c/0x6a50 kernel/fork.c:1876
copy_process kernel/fork.c:1586 [inline]
_do_fork+0x180/0xc80 kernel/fork.c:2070
kernel_thread+0x2f/0x40 kernel/fork.c:2132
create_kthread kernel/kthread.c:255 [inline]
kthreadd+0x4f8/0x6f0 kernel/kthread.c:567
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
-> #0 (tasklist_lock){.?.+}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x2d/0x40 kernel/locking/spinlock.c:224
send_sigio+0xa1/0x1d0 fs/fcntl.c:790
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync fs/fcntl.c:1011 [inline]
kill_fasync+0x1be/0x3c0 fs/fcntl.c:1004
tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49
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
arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
del_timer_sync+0x116/0x250 kernel/time/timer.c:1237
schedule_timeout+0x444/0xe40 kernel/time/timer.c:1747
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
other info that might help us debug this:
Chain exists of:
tasklist_lock --> &port_lock_key --> &(&new->fa_lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&new->fa_lock)->rlock);
lock(&port_lock_key);
lock(&(&new->fa_lock)->rlock);
lock(tasklist_lock);
*** DEADLOCK ***
6 locks held by rcu_preempt/8:
#0: (&(&i->lock)->rlock){-.-.}, at: [<ffffffff8341007b>] spin_lock include/linux/spinlock.h:317 [inline]
#0: (&(&i->lock)->rlock){-.-.}, at: [<ffffffff8341007b>] serial8250_interrupt+0x2b/0x1a0 drivers/tty/serial/8250/8250_core.c:119
#1: (&port_lock_key){-.-.}, at: [<ffffffff83420870>] serial8250_handle_irq.part.0+0x20/0x240 drivers/tty/serial/8250/8250_port.c:1872
#2: (&tty->ldisc_sem){++++}, at: [<ffffffff833b058b>] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305
#3: (rcu_read_lock){....}, at: [<ffffffff818f268d>] kill_fasync+0x3d/0x3c0 fs/fcntl.c:1009
#4: (&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync_rcu fs/fcntl.c:990 [inline]
#4: (&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync fs/fcntl.c:1011 [inline]
#4: (&(&new->fa_lock)->rlock){-.-.}, at: [<ffffffff818f276e>] kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004
#5: (&f->f_owner.lock){.?.?}, at: [<ffffffff818f24a4>] send_sigio+0x24/0x1d0 fs/fcntl.c:778
stack backtrace:
CPU: 0 PID: 8 Comm: rcu_preempt Not tainted 4.14.177-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]
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:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x2d/0x40 kernel/locking/spinlock.c:224
send_sigio+0xa1/0x1d0 fs/fcntl.c:790
kill_fasync_rcu fs/fcntl.c:997 [inline]
kill_fasync fs/fcntl.c:1011 [inline]
kill_fasync+0x1be/0x3c0 fs/fcntl.c:1004
tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:49
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
common_interrupt+0x8f/0x8f arch/x86/entry/entry_64.S:576
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:del_timer_sync+0x116/0x250 kernel/time/timer.c:1237
RSP: 0018:ffff8880a9867c28 EFLAGS: 00000297 ORIG_RAX: ffffffffffffffc8
RAX: ffff8880a9854200 RBX: ffff8880a9867cd0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000297
RBP: 0000000000000297 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a9867d00
R13: ffff8880aea239c0 R14: ffff8880aea239c0 R15: ffff8880a9867cd0
schedule_timeout+0x444/0xe40 kernel/time/timer.c:1747
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
CPU: 1 PID: 16082 Comm: syz-executor.3 Not tainted 4.14.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0x10a/0x14b lib/fault-inject.c:149
should_failslab+0xd6/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc_node mm/slab.c:3297 [inline]
kmem_cache_alloc_node_trace+0x292/0x7b0 mm/slab.c:3659
__do_kmalloc_node mm/slab.c:3681 [inline]
__kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
__kmalloc_reserve.isra.0+0x35/0xd0 net/core/skbuff.c:137
__alloc_skb+0xca/0x4c0 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:980 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1159 [inline]
netlink_sendmsg+0x7de/0xbe0 net/netlink/af_netlink.c:1853
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x70a/0x840 net/socket.c:2062
__sys_sendmsg+0xa3/0x120 net/socket.c:2096
SYSC_sendmsg net/socket.c:2107 [inline]
SyS_sendmsg+0x27/0x40 net/socket.c:2103
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007f0a158a6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004fdcc0 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000009
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000b
R13: 0000000000000948 R14: 00000000004d59c0 R15: 00007f0a158a76d4
netlink: 2 bytes leftover after parsing attributes in process `syz-executor.3'.
hfs: unable to parse mount options
hfs: unable to parse mount options
cifs_vfs_err: 27 callbacks suppressed
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
CIFS VFS: Malformed UNC in devname.
overlayfs: fs on '.' does not support file handles, falling back to index=off.
CIFS VFS: Malformed UNC in devname.
cifs_vfs_err: 4 callbacks suppressed
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
Unknown ioctl -1068978587
CIFS VFS: Malformed UNC in devname.
Unknown ioctl -1068978587
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
CIFS VFS: Malformed UNC in devname.
---
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
Aug 27, 2020, 10:07:16 AM8/27/20
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
Reply all
Reply to author
Forward
0 new messages