Re: INFO: task hung in io_uring_cancel_generic

From: Hao Sun
Date: Sun Sep 12 2021 - 22:27:09 EST

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Hi

Healer found a C reproducer for this crash ("INFO: task hung in
io_ring_exit_work").

HEAD commit: 4b93c544e90e-thunderbolt: test: split up test cases
git tree: upstream
console output:
https://drive.google.com/file/d/1NswMU2yMRTc8-EqbZcVvcJejV92cuZIk/view?usp=sharing
kernel config: https://drive.google.com/file/d/1c0u2EeRDhRO-ZCxr9MP2VvAtJd6kfg-p/view?usp=sharing
C reproducer: https://drive.google.com/file/d/170wk5_T8mYDaAtDcrdVi2UU9_dW1894s/view?usp=sharing
Syzlang reproducer:
https://drive.google.com/file/d/1eo-jAS9lncm4i-1kaCBkexrjpQHXboBq/view?usp=sharing

If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@xxxxxxxxx>

INFO: task kworker/u10:0:24 blocked for more than 143 seconds.
Not tainted 5.14.0+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:0 state:D stack:27224 pid: 24 ppid: 2 flags:0x00004000
Workqueue: events_unbound io_ring_exit_work
Call Trace:
context_switch kernel/sched/core.c:4940 [inline]
__schedule+0xcd9/0x2530 kernel/sched/core.c:6287
schedule+0xd3/0x270 kernel/sched/core.c:6366
schedule_timeout+0x5e5/0x890 kernel/time/timer.c:1857
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x17d/0x280 kernel/sched/completion.c:138
io_ring_exit_work+0x530/0x1540 fs/io_uring.c:9333
process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297
worker_thread+0x90/0xed0 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Showing all locks held in the system:
2 locks held by kworker/u10:0/24:
#0: ffff888010c71138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888010c71138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888010c71138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
atomic_long_set include/linux/atomic/atomic-instrumented.h:1198
[inline]
#0: ffff888010c71138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
set_work_data kernel/workqueue.c:634 [inline]
#0: ffff888010c71138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
#0: ffff888010c71138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
process_one_work+0x8c3/0x16d0 kernel/workqueue.c:2268
#1: ffffc900007efdc8
((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at:
process_one_work+0x8f7/0x16d0 kernel/workqueue.c:2272
1 lock held by khungtaskd/1161:
#0: ffffffff8b97dde0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446
1 lock held by in:imklog/8220:
#0: ffff88802031d4f0 (&f->f_pos_lock){+.+.}-{3:3}, at:
__fdget_pos+0xe9/0x100 fs/file.c:990

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1161 Comm: khungtaskd Not tainted 5.14.0+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1e1/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xcc8/0x1010 kernel/hung_task.c:295
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1-3:
NMI backtrace for cpu 1
CPU: 1 PID: 10654 Comm: syz-executor Not tainted 5.14.0+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x40 kernel/kcov.c:197
Code: 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 65 48 8b 0c 25 40 f0
01 00 bf 02 00 00 00 48 89 ce 4c 8b 04 24 e8 76 ff ff ff 84 c0 <74> 20
48 8b 91 20 15 00 00 8b 89 1c 15 00 00 48 8b 02 48 83 c0 01
RSP: 0018:ffffc900085df560 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000002 RCX: ffff888011b08000
RDX: 0000000000000000 RSI: ffff888011b08000 RDI: 0000000000000002
RBP: ffffc900085df728 R08: ffffffff88b6a994 R09: 0000000000000002
R10: 0000000000000005 R11: ffffed1002361000 R12: ffff88802d8fa100
R13: ffffc900085df620 R14: 00000000fffffe00 R15: 0000000000000002
FS: 00007f7828b86700(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3570c3c0a0 CR3: 0000000106990000 CR4: 0000000000350ee0
Call Trace:
p9_client_rpc+0x3d4/0x11c0 net/9p/client.c:759
p9_client_flush+0xe9/0x1e0 net/9p/client.c:667
p9_client_rpc+0x107e/0x11c0 net/9p/client.c:784
p9_client_version net/9p/client.c:955 [inline]
p9_client_create+0xbe0/0x13e0 net/9p/client.c:1055
v9fs_session_init+0x1e4/0x1900 fs/9p/v9fs.c:406
v9fs_mount+0x73/0x9d0 fs/9p/vfs_super.c:126
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1498
do_new_mount fs/namespace.c:2988 [inline]
path_mount+0x1228/0x1cb0 fs/namespace.c:3318
do_mount+0xf3/0x110 fs/namespace.c:3331
__do_sys_mount fs/namespace.c:3539 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x18f/0x230 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4739cd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7828b85c58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd
RDX: 0000000020000380 RSI: 0000000020000340 RDI: 0000000000000000
RBP: 00000000004ebd80 R08: 00000000200003c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059c0a0
R13: 00007ffd0845607f R14: 00007ffd08456220 R15: 00007f7828b85dc0
NMI backtrace for cpu 3
CPU: 3 PID: 4948 Comm: systemd-journal Not tainted 5.14.0+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3682 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3702 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3757 [inline]
RIP: 0010:__lock_acquire+0x1877/0x57e0 kernel/locking/lockdep.c:5015
Code: e5 40 08 c7 8f 48 89 5c 24 08 0f 84 6f 04 00 00 4a 8d 14 e5 40
08 c7 8f 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85
66 2f 00 00 4a 8b 1c e5 40 08 c7 8f 48 85 db 74 58 48 83 eb
RSP: 0018:ffffc9000107f868 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff8fc8e4b0 RCX: ffffffff815b148b
RDX: 1ffffffff1f91c96 RSI: 0000000000000008 RDI: ffffffff8fd008f8
RBP: ffff888013f4dfa0 R08: 0000000000000001 R09: fffffbfff1fa0120
R10: ffffffff8fd008ff R11: fffffbfff1fa011f R12: 0000000000003b8e
R13: ffff888013f4d580 R14: d03c86651a37c6c3 R15: 0000000000000000
FS: 00007f35737908c0(0000) GS:ffff888135d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3570caf000 CR3: 000000001b4d1000 CR4: 0000000000350ee0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x520 kernel/locking/lockdep.c:5590
seqcount_lockdep_reader_access include/linux/seqlock.h:103 [inline]
set_root+0x3be/0x560 fs/namei.c:940
nd_jump_root+0x38d/0x520 fs/namei.c:961
path_init+0xf81/0x1700 fs/namei.c:2359
path_lookupat.isra.0+0x30/0x580 fs/namei.c:2439
__filename_lookup+0x1ca/0x410 fs/namei.c:2478
filename_lookup fs/namei.c:2494 [inline]
user_path_at_empty+0x42/0x60 fs/namei.c:2801
user_path_at include/linux/namei.h:57 [inline]
do_faccessat+0x127/0x850 fs/open.c:421
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3572a4c9c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8
64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcba7c9ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffcba7cccd0 RCX: 00007f3572a4c9c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005623bd6869a3
RBP: 00007ffcba7c9df0 R08: 00005623bd67c3e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00005623bd7558a0 R15: 00007ffcba7ca2e0
NMI backtrace for cpu 2 skipped: idling at native_safe_halt
arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 2 skipped: idling at arch_safe_halt
arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 2 skipped: idling at default_idle+0xb/0x10
arch/x86/kernel/process.c:716
----------------
Code disassembly (best guess):
0: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
7: 00 00 00 00
b: 0f 1f 00 nopl (%rax)
e: 65 48 8b 0c 25 40 f0 mov %gs:0x1f040,%rcx
15: 01 00
17: bf 02 00 00 00 mov $0x2,%edi
1c: 48 89 ce mov %rcx,%rsi
1f: 4c 8b 04 24 mov (%rsp),%r8
23: e8 76 ff ff ff callq 0xffffff9e
28: 84 c0 test %al,%al
* 2a: 74 20 je 0x4c <-- trapping instruction
2c: 48 8b 91 20 15 00 00 mov 0x1520(%rcx),%rdx
33: 8b 89 1c 15 00 00 mov 0x151c(%rcx),%ecx
39: 48 8b 02 mov (%rdx),%rax
3c: 48 83 c0 01 add $0x1,%rax%

Pavel Begunkov <asml.silence@xxxxxxxxx> 于2021年9月9日周四上午4:16写道：

>
> On 9/8/21 7:57 AM, Hao Sun wrote:
> > Another similar report: INFO: task hung in io_ring_exit_work
> >
> > INFO: task kworker/u9:3:1867 blocked for more than 143 seconds.
> > Not tainted 5.14.0+ #13
> > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > task:kworker/u9:3 state:D stack:12344 pid: 1867 ppid: 2 flags:0x00004000
> > Workqueue: events_unbound io_ring_exit_work
>
> This one is different. I guess it may be difficult for syz to
> find a repro because of the delay before the warning appears.
> How about to reduce it to a lower value? like 2-5 seconds
>
> echo 5 > /proc/sys/kernel/hung_task_timeout_secs
>
> > Call Trace:
> > context_switch kernel/sched/core.c:4940 [inline]
> > __schedule+0x323/0xae0 kernel/sched/core.c:6287
> > schedule+0x36/0xe0 kernel/sched/core.c:6366
> > schedule_timeout+0x189/0x430 kernel/time/timer.c:1857
> > do_wait_for_common kernel/sched/completion.c:85 [inline]
> > __wait_for_common kernel/sched/completion.c:106 [inline]
> > wait_for_common kernel/sched/completion.c:117 [inline]
> > wait_for_completion+0xb4/0x110 kernel/sched/completion.c:138
> > io_ring_exit_work+0x287/0x850 fs/io_uring.c:9297
> > process_one_work+0x359/0x850 kernel/workqueue.c:2297
> > worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
> > kthread+0x178/0x1b0 kernel/kthread.c:319
> > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> > INFO: task kworker/u9:4:2050 blocked for more than 143 seconds.
> > Not tainted 5.14.0+ #13
> > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > task:kworker/u9:4 state:D stack:12232 pid: 2050 ppid: 2 flags:0x00004000
> > Workqueue: events_unbound io_ring_exit_work
> > Call Trace:
> > context_switch kernel/sched/core.c:4940 [inline]
> > __schedule+0x323/0xae0 kernel/sched/core.c:6287
> > schedule+0x36/0xe0 kernel/sched/core.c:6366
> > schedule_timeout+0x189/0x430 kernel/time/timer.c:1857
> > do_wait_for_common kernel/sched/completion.c:85 [inline]
> > __wait_for_common kernel/sched/completion.c:106 [inline]
> > wait_for_common kernel/sched/completion.c:117 [inline]
> > wait_for_completion+0xb4/0x110 kernel/sched/completion.c:138
> > io_ring_exit_work+0x287/0x850 fs/io_uring.c:9297
> > process_one_work+0x359/0x850 kernel/workqueue.c:2297
> > worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
> > kthread+0x178/0x1b0 kernel/kthread.c:319
> > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> >
> > Showing all locks held in the system:
> > 1 lock held by khungtaskd/1340:
> > #0: ffffffff85a1d3a0 (rcu_read_lock){....}-{1:2}, at:
> > debug_show_all_locks+0xe/0x1a0 kernel/locking/lockdep.c:6446
> > 2 locks held by kworker/u9:3/1867:
> > #0: ffff888008c5c938 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
> > set_work_data kernel/workqueue.c:633 [inline]
> > #0: ffff888008c5c938 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
> > set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
> > #0: ffff888008c5c938 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
> > process_one_work+0x2a0/0x850 kernel/workqueue.c:2268
> > #1: ffffc90003e67e70
> > ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: set_work_data
> > kernel/workqueue.c:633 [inline]
> > #1: ffffc90003e67e70
> > ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at:
> > set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
> > #1: ffffc90003e67e70
> > ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at:
> > process_one_work+0x2a0/0x850 kernel/workqueue.c:2268
> > 2 locks held by kworker/u9:4/2050:
> > #0: ffff888008c5c938 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
> > set_work_data kernel/workqueue.c:633 [inline]
> > #0: ffff888008c5c938 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
> > set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
> > #0: ffff888008c5c938 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
> > process_one_work+0x2a0/0x850 kernel/workqueue.c:2268
> > #1: ffffc90004327e70
> > ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: set_work_data
> > kernel/workqueue.c:633 [inline]
> > #1: ffffc90004327e70
> > ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at:
> > set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
> > #1: ffffc90004327e70
> > ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at:
> > process_one_work+0x2a0/0x850 kernel/workqueue.c:2268
> > 1 lock held by in:imklog/8089:
> > #0: ffff88800ece7ef0 (&f->f_pos_lock){+.+.}-{3:3}, at:
> > __fdget_pos+0x55/0x60 fs/file.c:990
> >
> > =============================================
> >
> > NMI backtrace for cpu 0
> > CPU: 0 PID: 1340 Comm: khungtaskd Not tainted 5.14.0+ #13
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> > Call Trace:
> > __dump_stack lib/dump_stack.c:88 [inline]
> > dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:105
> > nmi_cpu_backtrace+0x1e9/0x210 lib/nmi_backtrace.c:105
> > nmi_trigger_cpumask_backtrace+0x120/0x180 lib/nmi_backtrace.c:62
> > trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
> > check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
> > watchdog+0x4e1/0x980 kernel/hung_task.c:295
> > kthread+0x178/0x1b0 kernel/kthread.c:319
> > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> > Sending NMI from CPU 0 to CPUs 1-3:
> > NMI backtrace for cpu 1
> > CPU: 1 PID: 4934 Comm: systemd-journal Not tainted 5.14.0+ #13
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> > RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:91 [inline]
> > RIP: 0010:lock_acquire+0x1a4/0x340 kernel/locking/lockdep.c:5601
> > Code: 04 25 28 00 00 00 0f 85 b5 01 00 00 48 83 c4 38 5b 5d 41 5c 41
> > 5d 41 5e 41 5f c3 65 48 8b 04 25 40 70 01 00 8b 80 f4 09 00 00 <85> c0
> > 0f 85 c5 fe ff ff 9c 8f 04 24 fa 48 c7 c7 a0 36 5d 85 e8 e3
> > RSP: 0018:ffffc9000086fe18 EFLAGS: 00000246
> > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> > RDX: 0000000000000001 RSI: ffffffff852a8b94 RDI: ffffffff853cae8e
> > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85a1d3a0
> > R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
> > FS: 00007f940a97b8c0(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007f9407aa3000 CR3: 000000000f49a000 CR4: 0000000000750ee0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > PKRU: 55555554
> > Call Trace:
> > rcu_lock_acquire include/linux/rcupdate.h:267 [inline]
> > rcu_read_lock include/linux/rcupdate.h:687 [inline]
> > dput+0x72/0x650 fs/dcache.c:874
> > path_put+0x12/0x20 fs/namei.c:557
> > do_faccessat+0x1fa/0x370 fs/open.c:455
> > do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> > do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
> > entry_SYSCALL_64_after_hwframe+0x44/0xae
> > RIP: 0033:0x7f9409c379c7
> > Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8
> > 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d
> > 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
> > RSP: 002b:00007ffeead2d338 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
> > RAX: ffffffffffffffda RBX: 00007ffeead30250 RCX: 00007f9409c379c7
> > RDX: 00007f940a6a8a00 RSI: 0000000000000000 RDI: 000055d9e89aa9a3
> > RBP: 00007ffeead2d370 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
> > R13: 0000000000000000 R14: 00007ffeead30250 R15: 00007ffeead2d860
> > NMI backtrace for cpu 2 skipped: idling at native_safe_halt
> > arch/x86/include/asm/irqflags.h:51 [inline]
> > NMI backtrace for cpu 2 skipped: idling at arch_safe_halt
> > arch/x86/include/asm/irqflags.h:89 [inline]
> > NMI backtrace for cpu 2 skipped: idling at default_idle+0xb/0x10
> > arch/x86/kernel/process.c:716
> > NMI backtrace for cpu 3
> > CPU: 3 PID: 8091 Comm: rs:main Q:Reg Not tainted 5.14.0+ #13
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> > RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64
> > Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6
> > f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa
> > 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01
> > RSP: 0018:ffffc90007a23ba8 EFLAGS: 00010216
> > RAX: 0000000000000000 RBX: ffff88810cd3ec78 RCX: 0000000000000c85
> > RDX: 0000000000000d05 RSI: 0000000000000000 RDI: ffff888107f7b37b
> > RBP: 0000000000001000 R08: 0000000000000000 R09: ffff888107f7b2fb
> > R10: ffffc90007a23978 R11: 0000000000000005 R12: 0000000000000000
> > R13: 0000000000000000 R14: 0000000000001000 R15: ffffea00041fdec0
> > FS: 00007fd86dba4700(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 000055d6e0599858 CR3: 0000000012b38000 CR4: 0000000000750ee0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > PKRU: 55555554
> > Call Trace:
> > memset include/linux/fortify-string.h:175 [inline]
> > zero_user_segments include/linux/highmem.h:211 [inline]
> > ext4_block_write_begin+0x63e/0x980 fs/ext4/inode.c:1089
> > ext4_da_write_begin+0x275/0x610 fs/ext4/inode.c:3021
> > generic_perform_write+0xce/0x220 mm/filemap.c:3770
> > ext4_buffered_write_iter+0xd6/0x190 fs/ext4/file.c:269
> > ext4_file_write_iter+0x80/0x940 fs/ext4/file.c:680
> > call_write_iter include/linux/fs.h:2163 [inline]
> > new_sync_write+0x18d/0x260 fs/read_write.c:507
> > vfs_write+0x43b/0x4a0 fs/read_write.c:594
> > ksys_write+0xd2/0x120 fs/read_write.c:647
> > do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> > do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
> > entry_SYSCALL_64_after_hwframe+0x44/0xae
> > RIP: 0033:0x7fd8705e81cd
> > Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31
> > c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b
> > 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
> > RSP: 002b:00007fd86dba3590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
> > RAX: ffffffffffffffda RBX: 00007fd8640268f0 RCX: 00007fd8705e81cd
> > RDX: 00000000000004ce RSI: 00007fd8640268f0 RDI: 0000000000000008
> > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd864026670
> > R13: 00007fd86dba35b0 R14: 00005563e5cf4440 R15: 00000000000004ce
> > ----------------
> > Code disassembly (best guess):
> > 0: 04 25 add $0x25,%al
> > 2: 28 00 sub %al,(%rax)
> > 4: 00 00 add %al,(%rax)
> > 6: 0f 85 b5 01 00 00 jne 0x1c1
> > c: 48 83 c4 38 add $0x38,%rsp
> > 10: 5b pop %rbx
> > 11: 5d pop %rbp
> > 12: 41 5c pop %r12
> > 14: 41 5d pop %r13
> > 16: 41 5e pop %r14
> > 18: 41 5f pop %r15
> > 1a: c3 retq
> > 1b: 65 48 8b 04 25 40 70 mov %gs:0x17040,%rax
> > 22: 01 00
> > 24: 8b 80 f4 09 00 00 mov 0x9f4(%rax),%eax
> > * 2a: 85 c0 test %eax,%eax <-- trapping instruction
> > 2c: 0f 85 c5 fe ff ff jne 0xfffffef7
> > 32: 9c pushfq
> > 33: 8f 04 24 popq (%rsp)
> > 36: fa cli
> > 37: 48 c7 c7 a0 36 5d 85 mov $0xffffffff855d36a0,%rdi
> > 3e: e8 .byte 0xe8
> > 3f: e3 .byte 0xe3%
> >
> > Hao Sun <sunhao.th@xxxxxxxxx> 于2021年9月8日周三上午9:01写道：
> >>
> >> Pavel Begunkov <asml.silence@xxxxxxxxx> 于2021年9月8日周三上午5:31写道：
> >>>
> >>> On 9/7/21 8:30 PM, Jens Axboe wrote:
> >>>> On 9/7/21 5:50 AM, Hao Sun wrote:
> >>>>> Hello,
> >>>>>
> >>>>> When using Healer to fuzz the latest Linux kernel, the following crash
> >>>>> was triggered.
> >>>>>
> >>>>> HEAD commit: 7d2a07b76933 Linux 5.14
> >>>>> git tree: upstream
> >>>>> console output:
> >>>>> https://drive.google.com/file/d/1c8uRooM0TwJiTIwEviOCB4RC-hhOgGHR/view?usp=sharing
> >>>>> kernel config: https://drive.google.com/file/d/1XD9WYDViQLSXN7RGwH8AGGDvP9JvOghx/view?usp=sharing
> >>>>> Similar report:
> >>>>> https://groups.google.com/u/1/g/syzkaller-bugs/c/FvdcTiJIGtY/m/PcXkoenUAAAJ
> >>>>>
> >>>>> Sorry, I don't have a reproducer for this crash, hope the symbolized
> >>>>> report can help.
> >>>>> If you fix this issue, please add the following tag to the commit:
> >>>>> Reported-by: Hao Sun <sunhao.th@xxxxxxxxx>
> >>>>
> >>>> Would be great with a reproducer for this one, though...
> >>>
> >>> And syzbot usually sends an execution log with all syz programs
> >>> it run, which may be helpful. Any chance you have anything similar
> >>> left?
> >>>
> >>
> >> Yes, found it[1]. Here is an execution history with latest 1024
> >> executed progs before crash saved.
> >> Hope it can help. I'll also follow this crash closely, see if Healer
> >> can find a reproducer and send it to you once it found.
> >>
> >> [1] https://drive.google.com/file/d/14k8qOFeyKPD4HsqOpIjud3b9jsxFSo-u/view?usp=sharing
> >>
> >>> --
> >>> Pavel Begunkov
>
> --
> Pavel Begunkov

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