* [syzbot] possible deadlock in io_sq_thread_finish
@ 2021-03-07 9:49 syzbot
2021-03-07 12:39 ` Pavel Begunkov
` (2 more replies)
0 siblings, 3 replies; 15+ messages in thread
From: syzbot @ 2021-03-07 9:49 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: a38fd874 Linux 5.12-rc2
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=143ee02ad00000
kernel config: https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
============================================
WARNING: possible recursive locking detected
5.12.0-rc2-syzkaller #0 Not tainted
--------------------------------------------
kworker/u4:7/7615 is trying to acquire lock:
ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_stop fs/io_uring.c:7099 [inline]
ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_put_sq_data fs/io_uring.c:7115 [inline]
ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
but task is already holding lock:
ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&sqd->lock);
lock(&sqd->lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
3 locks held by kworker/u4:7/7615:
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
#1: ffffc900023a7da8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
#2: ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
#2: ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
stack backtrace:
CPU: 1 PID: 7615 Comm: kworker/u4:7 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_deadlock_bug kernel/locking/lockdep.c:2829 [inline]
check_deadlock kernel/locking/lockdep.c:2872 [inline]
validate_chain kernel/locking/lockdep.c:3661 [inline]
__lock_acquire.cold+0x14c/0x3b4 kernel/locking/lockdep.c:4900
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
__mutex_lock_common kernel/locking/mutex.c:946 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1093
io_sq_thread_stop fs/io_uring.c:7099 [inline]
io_put_sq_data fs/io_uring.c:7115 [inline]
io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
io_ring_ctx_free fs/io_uring.c:8408 [inline]
io_ring_exit_work+0x82/0x9a0 fs/io_uring.c:8539
process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
---
This report 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 [email protected].
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-07 9:49 [syzbot] possible deadlock in io_sq_thread_finish syzbot
@ 2021-03-07 12:39 ` Pavel Begunkov
2021-03-07 13:20 ` Pavel Begunkov
2021-03-09 14:04 ` syzbot
2021-04-08 19:43 ` syzbot
2 siblings, 1 reply; 15+ messages in thread
From: Pavel Begunkov @ 2021-03-07 12:39 UTC (permalink / raw)
To: syzbot, axboe, io-uring, linux-kernel, syzkaller-bugs
On 07/03/2021 09:49, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: a38fd874 Linux 5.12-rc2
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=143ee02ad00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
> dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
Legit error, park() might take an sqd lock, and then we take it again.
I'll patch it up
>
> ============================================
> WARNING: possible recursive locking detected
> 5.12.0-rc2-syzkaller #0 Not tainted
> --------------------------------------------
> kworker/u4:7/7615 is trying to acquire lock:
> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_stop fs/io_uring.c:7099 [inline]
> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_put_sq_data fs/io_uring.c:7115 [inline]
> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
>
> but task is already holding lock:
> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
>
> other info that might help us debug this:
> Possible unsafe locking scenario:
>
> CPU0
> ----
> lock(&sqd->lock);
> lock(&sqd->lock);
>
> *** DEADLOCK ***
>
> May be due to missing lock nesting notation
>
> 3 locks held by kworker/u4:7/7615:
> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
> #1: ffffc900023a7da8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
> #2: ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
> #2: ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
>
> stack backtrace:
> CPU: 1 PID: 7615 Comm: kworker/u4:7 Not tainted 5.12.0-rc2-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: events_unbound io_ring_exit_work
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x141/0x1d7 lib/dump_stack.c:120
> print_deadlock_bug kernel/locking/lockdep.c:2829 [inline]
> check_deadlock kernel/locking/lockdep.c:2872 [inline]
> validate_chain kernel/locking/lockdep.c:3661 [inline]
> __lock_acquire.cold+0x14c/0x3b4 kernel/locking/lockdep.c:4900
> lock_acquire kernel/locking/lockdep.c:5510 [inline]
> lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
> __mutex_lock_common kernel/locking/mutex.c:946 [inline]
> __mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1093
> io_sq_thread_stop fs/io_uring.c:7099 [inline]
> io_put_sq_data fs/io_uring.c:7115 [inline]
> io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
> io_ring_ctx_free fs/io_uring.c:8408 [inline]
> io_ring_exit_work+0x82/0x9a0 fs/io_uring.c:8539
> process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
> worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
> kthread+0x3b1/0x4a0 kernel/kthread.c:292
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
>
>
> ---
> This report 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 [email protected].
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
--
Pavel Begunkov
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-07 12:39 ` Pavel Begunkov
@ 2021-03-07 13:20 ` Pavel Begunkov
0 siblings, 0 replies; 15+ messages in thread
From: Pavel Begunkov @ 2021-03-07 13:20 UTC (permalink / raw)
To: syzbot, axboe, io-uring, linux-kernel, syzkaller-bugs
On 07/03/2021 12:39, Pavel Begunkov wrote:
> On 07/03/2021 09:49, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: a38fd874 Linux 5.12-rc2
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=143ee02ad00000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
>> dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
>>
>> Unfortunately, I don't have any reproducer for this issue yet.
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: [email protected]
>
> Legit error, park() might take an sqd lock, and then we take it again.
> I'll patch it up
I was wrong, it looks fine, io_put_sq_data() and io_sq_thread_park()
don't nest. I wonder if that's a false positive due to conditional
locking as below
if (sqd->thread == current)
return;
mutex_lock(&sqd->lock);
>
>>
>> ============================================
>> WARNING: possible recursive locking detected
>> 5.12.0-rc2-syzkaller #0 Not tainted
>> --------------------------------------------
>> kworker/u4:7/7615 is trying to acquire lock:
>> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_stop fs/io_uring.c:7099 [inline]
>> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_put_sq_data fs/io_uring.c:7115 [inline]
>> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
>>
>> but task is already holding lock:
>> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
>> ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
>>
>> other info that might help us debug this:
>> Possible unsafe locking scenario:
>>
>> CPU0
>> ----
>> lock(&sqd->lock);
>> lock(&sqd->lock);
>>
>> *** DEADLOCK ***
>>
>> May be due to missing lock nesting notation
>>
>> 3 locks held by kworker/u4:7/7615:
>> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
>> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
>> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
>> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
>> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
>> #0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
>> #1: ffffc900023a7da8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
>> #2: ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
>> #2: ffff888144a02870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
>>
>> stack backtrace:
>> CPU: 1 PID: 7615 Comm: kworker/u4:7 Not tainted 5.12.0-rc2-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>> Workqueue: events_unbound io_ring_exit_work
>> Call Trace:
>> __dump_stack lib/dump_stack.c:79 [inline]
>> dump_stack+0x141/0x1d7 lib/dump_stack.c:120
>> print_deadlock_bug kernel/locking/lockdep.c:2829 [inline]
>> check_deadlock kernel/locking/lockdep.c:2872 [inline]
>> validate_chain kernel/locking/lockdep.c:3661 [inline]
>> __lock_acquire.cold+0x14c/0x3b4 kernel/locking/lockdep.c:4900
>> lock_acquire kernel/locking/lockdep.c:5510 [inline]
>> lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
>> __mutex_lock_common kernel/locking/mutex.c:946 [inline]
>> __mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1093
>> io_sq_thread_stop fs/io_uring.c:7099 [inline]
>> io_put_sq_data fs/io_uring.c:7115 [inline]
>> io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
>> io_ring_ctx_free fs/io_uring.c:8408 [inline]
>> io_ring_exit_work+0x82/0x9a0 fs/io_uring.c:8539
>> process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
>> worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
>> kthread+0x3b1/0x4a0 kernel/kthread.c:292
>> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
>>
>>
>> ---
>> This report 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 [email protected].
>>
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>
>
--
Pavel Begunkov
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-07 9:49 [syzbot] possible deadlock in io_sq_thread_finish syzbot
2021-03-07 12:39 ` Pavel Begunkov
@ 2021-03-09 14:04 ` syzbot
2021-03-09 14:57 ` Jens Axboe
2021-04-08 19:43 ` syzbot
2 siblings, 1 reply; 15+ messages in thread
From: syzbot @ 2021-03-09 14:04 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: 144c79ef Merge tag 'perf-tools-fixes-for-v5.12-2020-03-07'..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=129addbcd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167574dad00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c8f566d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
============================================
WARNING: possible recursive locking detected
5.12.0-rc2-syzkaller #0 Not tainted
--------------------------------------------
kworker/u4:7/8696 is trying to acquire lock:
ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_stop fs/io_uring.c:7099 [inline]
ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_put_sq_data fs/io_uring.c:7115 [inline]
ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
but task is already holding lock:
ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&sqd->lock);
lock(&sqd->lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
3 locks held by kworker/u4:7/8696:
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff888010469138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
#1: ffffc9000253fda8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
#2: ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7088 [inline]
#2: ffff888015395870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x63/0xc0 fs/io_uring.c:7082
stack backtrace:
CPU: 0 PID: 8696 Comm: kworker/u4:7 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_deadlock_bug kernel/locking/lockdep.c:2829 [inline]
check_deadlock kernel/locking/lockdep.c:2872 [inline]
validate_chain kernel/locking/lockdep.c:3661 [inline]
__lock_acquire.cold+0x14c/0x3b4 kernel/locking/lockdep.c:4900
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
__mutex_lock_common kernel/locking/mutex.c:946 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1093
io_sq_thread_stop fs/io_uring.c:7099 [inline]
io_put_sq_data fs/io_uring.c:7115 [inline]
io_sq_thread_finish+0x408/0x650 fs/io_uring.c:7139
io_ring_ctx_free fs/io_uring.c:8408 [inline]
io_ring_exit_work+0x82/0x9a0 fs/io_uring.c:8539
process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 14:04 ` syzbot
@ 2021-03-09 14:57 ` Jens Axboe
2021-03-09 22:29 ` syzbot
[not found] ` <[email protected]>
0 siblings, 2 replies; 15+ messages in thread
From: Jens Axboe @ 2021-03-09 14:57 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
On 3/9/21 7:04 AM, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 144c79ef Merge tag 'perf-tools-fixes-for-v5.12-2020-03-07'..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=129addbcd00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
> dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167574dad00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c8f566d00000
#syz test: git://git.kernel.dk/linux-block io_uring-5.12
--
Jens Axboe
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 14:57 ` Jens Axboe
@ 2021-03-09 22:29 ` syzbot
2021-03-09 23:34 ` Jens Axboe
` (2 more replies)
[not found] ` <[email protected]>
1 sibling, 3 replies; 15+ messages in thread
From: syzbot @ 2021-03-09 22:29 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in io_sq_thread
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
Read of size 8 at addr ffff888034cbfc78 by task iou-sqp-10518/10523
CPU: 0 PID: 10523 Comm: iou-sqp-10518 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
__lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
down_write+0x92/0x150 kernel/locking/rwsem.c:1406
io_sq_thread+0x1220/0x1b10 fs/io_uring.c:6754
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Allocated by task 10518:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:427 [inline]
____kasan_kmalloc mm/kasan/common.c:506 [inline]
____kasan_kmalloc mm/kasan/common.c:465 [inline]
__kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
kmalloc include/linux/slab.h:554 [inline]
kzalloc include/linux/slab.h:684 [inline]
io_get_sq_data fs/io_uring.c:7156 [inline]
io_sq_offload_create fs/io_uring.c:7830 [inline]
io_uring_create fs/io_uring.c:9443 [inline]
io_uring_setup+0x1552/0x2860 fs/io_uring.c:9523
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 396:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:1562 [inline]
slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
slab_free mm/slub.c:3161 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4213
io_put_sq_data fs/io_uring.c:7098 [inline]
io_sq_thread_finish+0x4b0/0x5f0 fs/io_uring.c:7116
io_ring_ctx_free fs/io_uring.c:8355 [inline]
io_ring_exit_work+0x333/0xcf0 fs/io_uring.c:8525
process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
The buggy address belongs to the object at ffff888034cbfc00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 120 bytes inside of
512-byte region [ffff888034cbfc00, ffff888034cbfe00)
The buggy address belongs to the page:
page:000000004a1f04c4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34cbc
head:000000004a1f04c4 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88800fc41c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888034cbfb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888034cbfb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888034cbfc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888034cbfc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888034cbfd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 8bf06ba6 io_uring: remove unneeded variable 'ret'
git tree: git://git.kernel.dk/linux-block io_uring-5.12
console output: https://syzkaller.appspot.com/x/log.txt?x=13fcd952d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3c6cab008c50864
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
compiler:
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 22:29 ` syzbot
@ 2021-03-09 23:34 ` Jens Axboe
2021-03-10 3:46 ` syzbot
2021-03-09 23:45 ` Jens Axboe
2021-03-10 14:37 ` Jens Axboe
2 siblings, 1 reply; 15+ messages in thread
From: Jens Axboe @ 2021-03-09 23:34 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
#syz test: git://git.kernel.dk/linux-block io_uring-5.12
--
Jens Axboe
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 23:34 ` Jens Axboe
@ 2021-03-10 3:46 ` syzbot
0 siblings, 0 replies; 15+ messages in thread
From: syzbot @ 2021-03-10 3:46 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in io_sq_thread
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
Read of size 8 at addr ffff888023e47c78 by task iou-sqp-10156/10158
CPU: 0 PID: 10158 Comm: iou-sqp-10156 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
__lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
down_write+0x92/0x150 kernel/locking/rwsem.c:1406
io_sq_thread+0x1220/0x1b10 fs/io_uring.c:6754
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Allocated by task 10156:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:427 [inline]
____kasan_kmalloc mm/kasan/common.c:506 [inline]
____kasan_kmalloc mm/kasan/common.c:465 [inline]
__kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
kmalloc include/linux/slab.h:554 [inline]
kzalloc include/linux/slab.h:684 [inline]
io_get_sq_data fs/io_uring.c:7153 [inline]
io_sq_offload_create fs/io_uring.c:7827 [inline]
io_uring_create fs/io_uring.c:9443 [inline]
io_uring_setup+0x154b/0x2940 fs/io_uring.c:9523
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 3392:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:1562 [inline]
slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
slab_free mm/slub.c:3161 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4213
io_put_sq_data fs/io_uring.c:7095 [inline]
io_sq_thread_finish+0x48e/0x5b0 fs/io_uring.c:7113
io_ring_ctx_free fs/io_uring.c:8355 [inline]
io_ring_exit_work+0x333/0xcf0 fs/io_uring.c:8525
process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
The buggy address belongs to the object at ffff888023e47c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 120 bytes inside of
512-byte region [ffff888023e47c00, ffff888023e47e00)
The buggy address belongs to the page:
page:00000000200f7571 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888023e47400 pfn:0x23e44
head:00000000200f7571 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 ffffea00005f6908 ffffea0000527508 ffff88800fc41c80
raw: ffff888023e47400 000000000010000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888023e47b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888023e47b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888023e47c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023e47c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023e47d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: dc5c40fb io_uring: always wait for sqd exited when stoppin..
git tree: git://git.kernel.dk/linux-block io_uring-5.12
console output: https://syzkaller.appspot.com/x/log.txt?x=16cd022cd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3c6cab008c50864
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
compiler:
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 22:29 ` syzbot
2021-03-09 23:34 ` Jens Axboe
@ 2021-03-09 23:45 ` Jens Axboe
2021-03-10 4:12 ` syzbot
2021-03-10 14:37 ` Jens Axboe
2 siblings, 1 reply; 15+ messages in thread
From: Jens Axboe @ 2021-03-09 23:45 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
#syz test: git://git.kernel.dk/linux-block io_uring-5.12
--
Jens Axboe
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 23:45 ` Jens Axboe
@ 2021-03-10 4:12 ` syzbot
0 siblings, 0 replies; 15+ messages in thread
From: syzbot @ 2021-03-10 4:12 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in io_sq_thread
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
Read of size 8 at addr ffff88801d418c78 by task iou-sqp-10269/10271
CPU: 1 PID: 10271 Comm: iou-sqp-10269 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
__lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
down_write+0x92/0x150 kernel/locking/rwsem.c:1406
io_sq_thread+0x1220/0x1b10 fs/io_uring.c:6754
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Allocated by task 10269:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:427 [inline]
____kasan_kmalloc mm/kasan/common.c:506 [inline]
____kasan_kmalloc mm/kasan/common.c:465 [inline]
__kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
kmalloc include/linux/slab.h:554 [inline]
kzalloc include/linux/slab.h:684 [inline]
io_get_sq_data fs/io_uring.c:7153 [inline]
io_sq_offload_create fs/io_uring.c:7827 [inline]
io_uring_create fs/io_uring.c:9443 [inline]
io_uring_setup+0x154b/0x2940 fs/io_uring.c:9523
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 9:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
kasan_slab_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:1562 [inline]
slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
slab_free mm/slub.c:3161 [inline]
kfree+0xe5/0x7f0 mm/slub.c:4213
io_put_sq_data fs/io_uring.c:7095 [inline]
io_sq_thread_finish+0x48e/0x5b0 fs/io_uring.c:7113
io_ring_ctx_free fs/io_uring.c:8355 [inline]
io_ring_exit_work+0x333/0xcf0 fs/io_uring.c:8525
process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
The buggy address belongs to the object at ffff88801d418c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 120 bytes inside of
512-byte region [ffff88801d418c00, ffff88801d418e00)
The buggy address belongs to the page:
page:00000000311e6f59 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d418
head:00000000311e6f59 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88800fc41c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801d418b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801d418b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801d418c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801d418c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d418d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: dc5c40fb io_uring: always wait for sqd exited when stoppin..
git tree: git://git.kernel.dk/linux-block io_uring-5.12
console output: https://syzkaller.appspot.com/x/log.txt?x=111d175cd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3c6cab008c50864
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
compiler:
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-09 22:29 ` syzbot
2021-03-09 23:34 ` Jens Axboe
2021-03-09 23:45 ` Jens Axboe
@ 2021-03-10 14:37 ` Jens Axboe
2021-03-10 15:29 ` syzbot
2 siblings, 1 reply; 15+ messages in thread
From: Jens Axboe @ 2021-03-10 14:37 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
#syz test: git://git.kernel.dk/linux-block io_uring-5.12
--
Jens Axboe
^ permalink raw reply [flat|nested] 15+ messages in thread
[parent not found: <[email protected]>]
* Re: [syzbot] possible deadlock in io_sq_thread_finish
[not found] ` <[email protected]>
@ 2021-03-10 13:40 ` Pavel Begunkov
2021-03-10 14:26 ` Jens Axboe
0 siblings, 1 reply; 15+ messages in thread
From: Pavel Begunkov @ 2021-03-10 13:40 UTC (permalink / raw)
To: Hillf Danton, syzbot; +Cc: axboe, io-uring, linux-kernel, syzkaller-bugs
On 10/03/2021 04:10, Hillf Danton wrote:>
> Fix 05ff6c4a0e07 ("io_uring: SQPOLL parking fixes") in the current tree
> by removing the extra set of IO_SQ_THREAD_SHOULD_STOP in response to
> the arrival of urgent signal because it misleads io_sq_thread_stop(),
> though a followup cleanup should go there.
That's actually reasonable, just like
8bff1bf8abeda ("io_uring: fix io_sq_offload_create error handling")
Are you going to send a patch?
>
> --- x/fs/io_uring.c
> +++ y/fs/io_uring.c
> @@ -6689,10 +6689,8 @@ static int io_sq_thread(void *data)
> io_sqd_init_new(sqd);
> timeout = jiffies + sqd->sq_thread_idle;
> }
> - if (fatal_signal_pending(current)) {
> - set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state);
> + if (fatal_signal_pending(current))
> break;
> - }
> sqt_spin = false;
> cap_entries = !list_is_singular(&sqd->ctx_list);
> list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
>
--
Pavel Begunkov
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-10 13:40 ` Pavel Begunkov
@ 2021-03-10 14:26 ` Jens Axboe
0 siblings, 0 replies; 15+ messages in thread
From: Jens Axboe @ 2021-03-10 14:26 UTC (permalink / raw)
To: Pavel Begunkov, Hillf Danton, syzbot
Cc: io-uring, linux-kernel, syzkaller-bugs
On 3/10/21 6:40 AM, Pavel Begunkov wrote:
> On 10/03/2021 04:10, Hillf Danton wrote:>
>> Fix 05ff6c4a0e07 ("io_uring: SQPOLL parking fixes") in the current tree
>> by removing the extra set of IO_SQ_THREAD_SHOULD_STOP in response to
>> the arrival of urgent signal because it misleads io_sq_thread_stop(),
>> though a followup cleanup should go there.
>
> That's actually reasonable, just like
> 8bff1bf8abeda ("io_uring: fix io_sq_offload_create error handling")
>
> Are you going to send a patch?
Agree - Hillf, do you mind if I just fold this one in?
--
Jens Axboe
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [syzbot] possible deadlock in io_sq_thread_finish
2021-03-07 9:49 [syzbot] possible deadlock in io_sq_thread_finish syzbot
2021-03-07 12:39 ` Pavel Begunkov
2021-03-09 14:04 ` syzbot
@ 2021-04-08 19:43 ` syzbot
2 siblings, 0 replies; 15+ messages in thread
From: syzbot @ 2021-04-08 19:43 UTC (permalink / raw)
To: asml.silence, axboe, bp, hdanton, hpa, io-uring, jmattson, joro,
kvm, linux-kernel, mingo, pbonzini, seanjc, syzkaller-bugs, tglx,
vkuznets, wanpengli, x86
syzbot suspects this issue was fixed by commit:
commit f4e61f0c9add3b00bd5f2df3c814d688849b8707
Author: Wanpeng Li <[email protected]>
Date: Mon Mar 15 06:55:28 2021 +0000
x86/kvm: Fix broken irq restoration in kvm_wait
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1022d7aad00000
start commit: 144c79ef Merge tag 'perf-tools-fixes-for-v5.12-2020-03-07'..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=db9c6adb4986f2f2
dashboard link: https://syzkaller.appspot.com/bug?extid=ac39856cb1b332dbbdda
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167574dad00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c8f566d00000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: x86/kvm: Fix broken irq restoration in kvm_wait
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 15+ messages in thread
end of thread, other threads:[~2021-04-08 19:43 UTC | newest]
Thread overview: 15+ messages (download: mbox.gz follow: Atom feed
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2021-03-07 9:49 [syzbot] possible deadlock in io_sq_thread_finish syzbot
2021-03-07 12:39 ` Pavel Begunkov
2021-03-07 13:20 ` Pavel Begunkov
2021-03-09 14:04 ` syzbot
2021-03-09 14:57 ` Jens Axboe
2021-03-09 22:29 ` syzbot
2021-03-09 23:34 ` Jens Axboe
2021-03-10 3:46 ` syzbot
2021-03-09 23:45 ` Jens Axboe
2021-03-10 4:12 ` syzbot
2021-03-10 14:37 ` Jens Axboe
2021-03-10 15:29 ` syzbot
[not found] ` <[email protected]>
2021-03-10 13:40 ` Pavel Begunkov
2021-03-10 14:26 ` Jens Axboe
2021-04-08 19:43 ` syzbot
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