INFO: task hung in truncate_inode_pages_range
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syzbot
Dec 10, 2017, 8:34:05 AM12/10/17
to linux-...@vger.kernel.org, mi...@redhat.com, pet...@infradead.org, syzkall...@googlegroups.com
Hello,
syzkaller hit the following crash on
ad4dac17f9d563b9e34aab78a34293b10993e9b5
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
Unfortunately, I don't have any reproducer for this bug yet.
INFO: task syz-executor6:9207 blocked for more than 120 seconds.
Not tainted 4.15.0-rc2-next-20171208+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6 D21264 9207 3394 0x80000002
Call Trace:
context_switch kernel/sched/core.c:2800 [inline]
__schedule+0x8eb/0x2060 kernel/sched/core.c:3376
schedule+0xf5/0x430 kernel/sched/core.c:3435
io_schedule+0x1c/0x70 kernel/sched/core.c:5043
wait_on_page_bit_common mm/filemap.c:1099 [inline]
__lock_page+0x585/0x740 mm/filemap.c:1272
lock_page include/linux/pagemap.h:483 [inline]
truncate_inode_pages_range+0x1945/0x1f90 mm/truncate.c:452
truncate_inode_pages+0x24/0x30 mm/truncate.c:482
kill_bdev+0xbc/0xf0 fs/block_dev.c:86
__blkdev_put+0x183/0x7c0 fs/block_dev.c:1764
blkdev_put+0x85/0x4f0 fs/block_dev.c:1835
blkdev_close+0x91/0xc0 fs/block_dev.c:1842
__fput+0x333/0x7f0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9bb/0x1ae0 kernel/exit.c:869
do_group_exit+0x149/0x400 kernel/exit.c:972
get_signal+0x73f/0x16c0 kernel/signal.c:2337
do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:161
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f8d5a5edc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000028
RAX: fffffffffffffffc RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000020d10ff8 RSI: 000000000000001c RDI: 000000000000001c
RBP: 000000000000045b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000212 R12: 00000000006f4928
R13: 00000000ffffffff R14: 00007f8d5a5ee6d4 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/671:
#0: (rcu_read_lock){....}, at: [<00000000df4af4d1>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000df4af4d1>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000b61748dc>]
debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554
2 locks held by getty/3117:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3118:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3119:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3120:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3121:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3122:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3123:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
1 lock held by syz-executor6/9207:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000003bb9433b>]
__blkdev_put+0xa7/0x7c0 fs/block_dev.c:1757
1 lock held by blkid/9235:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000dd49b480>]
__blkdev_get+0x158/0x10e0 fs/block_dev.c:1439
1 lock held by syz-executor6/9345:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000dd49b480>]
__blkdev_get+0x158/0x10e0 fs/block_dev.c:1439
1 lock held by syz-executor6/9346:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000dd49b480>]
__blkdev_get+0x158/0x10e0 fs/block_dev.c:1439
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 671 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171208+ #63
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+0x194/0x257 lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x37a/0x440 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc2-next-20171208+ #63
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:add_xhlock kernel/locking/lockdep.c:4871 [inline]
RIP: 0010:check_add_xhlock kernel/locking/lockdep.c:4907 [inline]
RIP: 0010:lock_acquire_crosslock kernel/locking/lockdep.c:4979 [inline]
RIP: 0010:__lock_acquire+0x1f9e/0x47f0 kernel/locking/lockdep.c:3503
RSP: 0018:ffff8801db306fe0 EFLAGS: 00000807
RAX: 0000000000001e7b RBX: ffff8801d9f88b88 RCX: 0000000000000000
RDX: 1ffff1003b3f1293 RSI: 1ffff1003b3f1101 RDI: ffff8801d9f8949c
RBP: ffff8801db307368 R08: 0000000000000000 R09: 000000000000000c
R10: 0000000000000000 R11: ffffffff87896ce0 R12: ffff8801d9f88300
R13: ffff8801d9f8d4d8 R14: 9dd28c6188bbd6db R15: ffff8801d9f88300
FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016dd000 CR3: 00000001cceea000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:159
rq_lock_irqsave kernel/sched/sched.h:1750 [inline]
update_blocked_averages+0x124/0x1b60 kernel/sched/fair.c:7353
rebalance_domains+0x145/0xcc0 kernel/sched/fair.c:9122
run_rebalance_domains+0x381/0x780 kernel/sched/fair.c:9383
__do_softirq+0x29d/0xbb2 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
scheduler_ipi+0x32a/0x830 kernel/sched/core.c:1804
smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:944
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffff8801d9f97da8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffff1003b3f2fb8 RCX: 0000000000000000
RDX: 1ffffffff0c5975c RSI: 0000000000000001 RDI: ffffffff862cbae0
RBP: ffff8801d9f97da8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801d9f97e60 R14: ffffffff869efaa0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:355
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:346
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
start_secondary+0x330/0x460 arch/x86/kernel/smpboot.c:277
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 48 8b 43 08 48 89 fa 48 c1 ea 03 49 89 45 50 48 8b 43 10 49 89 45 58
48 8b 43 18 49 89 45 60 48 8b 43 20 49 89 45 68 48 8b 43 28 <49> 89 45 70
48 b8 00 00 00 00 00 fc ff df 0f b6 14 02 48 89 f8
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
Please credit me with: Reported-by: syzbot <syzk...@googlegroups.com>
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Note: if the crash happens again, it will cause creation of a new bug
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syzkaller hit the following crash on
ad4dac17f9d563b9e34aab78a34293b10993e9b5
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
Unfortunately, I don't have any reproducer for this bug yet.
INFO: task syz-executor6:9207 blocked for more than 120 seconds.
Not tainted 4.15.0-rc2-next-20171208+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6 D21264 9207 3394 0x80000002
Call Trace:
context_switch kernel/sched/core.c:2800 [inline]
__schedule+0x8eb/0x2060 kernel/sched/core.c:3376
schedule+0xf5/0x430 kernel/sched/core.c:3435
io_schedule+0x1c/0x70 kernel/sched/core.c:5043
wait_on_page_bit_common mm/filemap.c:1099 [inline]
__lock_page+0x585/0x740 mm/filemap.c:1272
lock_page include/linux/pagemap.h:483 [inline]
truncate_inode_pages_range+0x1945/0x1f90 mm/truncate.c:452
truncate_inode_pages+0x24/0x30 mm/truncate.c:482
kill_bdev+0xbc/0xf0 fs/block_dev.c:86
__blkdev_put+0x183/0x7c0 fs/block_dev.c:1764
blkdev_put+0x85/0x4f0 fs/block_dev.c:1835
blkdev_close+0x91/0xc0 fs/block_dev.c:1842
__fput+0x333/0x7f0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9bb/0x1ae0 kernel/exit.c:869
do_group_exit+0x149/0x400 kernel/exit.c:972
get_signal+0x73f/0x16c0 kernel/signal.c:2337
do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:161
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f8d5a5edc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000028
RAX: fffffffffffffffc RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000020d10ff8 RSI: 000000000000001c RDI: 000000000000001c
RBP: 000000000000045b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000212 R12: 00000000006f4928
R13: 00000000ffffffff R14: 00007f8d5a5ee6d4 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/671:
#0: (rcu_read_lock){....}, at: [<00000000df4af4d1>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000df4af4d1>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000b61748dc>]
debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554
2 locks held by getty/3117:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3118:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3119:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3120:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3121:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3122:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
2 locks held by getty/3123:
#0: (&tty->ldisc_sem){++++}, at: [<0000000083232a91>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000884d0566>]
n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131
1 lock held by syz-executor6/9207:
#0: (&bdev->bd_mutex){+.+.}, at: [<000000003bb9433b>]
__blkdev_put+0xa7/0x7c0 fs/block_dev.c:1757
1 lock held by blkid/9235:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000dd49b480>]
__blkdev_get+0x158/0x10e0 fs/block_dev.c:1439
1 lock held by syz-executor6/9345:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000dd49b480>]
__blkdev_get+0x158/0x10e0 fs/block_dev.c:1439
1 lock held by syz-executor6/9346:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000dd49b480>]
__blkdev_get+0x158/0x10e0 fs/block_dev.c:1439
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 671 Comm: khungtaskd Not tainted 4.15.0-rc2-next-20171208+ #63
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+0x194/0x257 lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x37a/0x440 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc2-next-20171208+ #63
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:add_xhlock kernel/locking/lockdep.c:4871 [inline]
RIP: 0010:check_add_xhlock kernel/locking/lockdep.c:4907 [inline]
RIP: 0010:lock_acquire_crosslock kernel/locking/lockdep.c:4979 [inline]
RIP: 0010:__lock_acquire+0x1f9e/0x47f0 kernel/locking/lockdep.c:3503
RSP: 0018:ffff8801db306fe0 EFLAGS: 00000807
RAX: 0000000000001e7b RBX: ffff8801d9f88b88 RCX: 0000000000000000
RDX: 1ffff1003b3f1293 RSI: 1ffff1003b3f1101 RDI: ffff8801d9f8949c
RBP: ffff8801db307368 R08: 0000000000000000 R09: 000000000000000c
R10: 0000000000000000 R11: ffffffff87896ce0 R12: ffff8801d9f88300
R13: ffff8801d9f8d4d8 R14: 9dd28c6188bbd6db R15: ffff8801d9f88300
FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016dd000 CR3: 00000001cceea000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:159
rq_lock_irqsave kernel/sched/sched.h:1750 [inline]
update_blocked_averages+0x124/0x1b60 kernel/sched/fair.c:7353
rebalance_domains+0x145/0xcc0 kernel/sched/fair.c:9122
run_rebalance_domains+0x381/0x780 kernel/sched/fair.c:9383
__do_softirq+0x29d/0xbb2 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
scheduler_ipi+0x32a/0x830 kernel/sched/core.c:1804
smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:944
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffff8801d9f97da8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffff1003b3f2fb8 RCX: 0000000000000000
RDX: 1ffffffff0c5975c RSI: 0000000000000001 RDI: ffffffff862cbae0
RBP: ffff8801d9f97da8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801d9f97e60 R14: ffffffff869efaa0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:355
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:346
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
start_secondary+0x330/0x460 arch/x86/kernel/smpboot.c:277
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 48 8b 43 08 48 89 fa 48 c1 ea 03 49 89 45 50 48 8b 43 10 49 89 45 58
48 8b 43 18 49 89 45 60 48 8b 43 20 49 89 45 68 48 8b 43 28 <49> 89 45 70
48 b8 00 00 00 00 00 fc ff df 0f b6 14 02 48 89 f8
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
Please credit me with: Reported-by: syzbot <syzk...@googlegroups.com>
syzbot will keep track of this bug report.
Once a fix for this bug is merged into any tree, reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
Dmitry Vyukov
Dec 12, 2017, 11:49:46 AM12/12/17
to syzbot, LKML, Ingo Molnar, Peter Zijlstra, syzkall...@googlegroups.com, Jens Axboe, Ming Lei, Omar Sandoval, Hannes Reinecke, sh...@fb.com
On Sun, Dec 10, 2017 at 2:34 PM, syzbot
<bot+73ca12738d47b49568...@syzkaller.appspotmail.com>
wrote:
+loop maintainers
#syz dup: INFO: task hung in lo_ioctl
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzk...@googlegroups.com.
> Please credit me with: Reported-by: syzbot <syzk...@googlegroups.com>
>
> syzbot will keep track of this bug report.
> Once a fix for this bug is merged into any tree, reply to this email with:
> #syz fix: exact-commit-title
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
>
> --
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<bot+73ca12738d47b49568...@syzkaller.appspotmail.com>
wrote:
#syz dup: INFO: task hung in lo_ioctl
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzk...@googlegroups.com.
> Please credit me with: Reported-by: syzbot <syzk...@googlegroups.com>
>
> syzbot will keep track of this bug report.
> Once a fix for this bug is merged into any tree, reply to this email with:
> #syz fix: exact-commit-title
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
>
> You received this message because you are subscribed to the Google Groups
> "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to syzkaller-bug...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/syzkaller-bugs/94eb2c05a522848247055ffc78a3%40google.com.
> For more options, visit https://groups.google.com/d/optout.
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