* [PATCH io_uring backport to 5.13.y] io_uring: Fix race condition when sqp thread goes to sleep
@ 2021-07-25 5:07 Olivier Langlois
2021-07-25 19:10 ` Jens Axboe
0 siblings, 1 reply; 3+ messages in thread
From: Olivier Langlois @ 2021-07-25 5:07 UTC (permalink / raw)
To: Jens Axboe, Pavel Begunkov, io-uring, linux-kernel, stable,
gregkh
[ Upstream commit 997135017716 ("io_uring: Fix race condition when sqp thread goes to sleep") ]
If an asynchronous completion happens before the task is preparing
itself to wait and set its state to TASK_INTERRUPTIBLE, the completion
will not wake up the sqp thread.
Signed-off-by: Olivier Langlois <[email protected]>
---
fs/io_uring.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index eeea6b8c8bee..a7f1cbd7be9a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6876,7 +6876,8 @@ static int io_sq_thread(void *data)
}
prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE);
- if (!test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state)) {
+ if (!test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) &&
+ !io_run_task_work()) {
list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
io_ring_set_wakeup_flag(ctx);
--
2.32.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH io_uring backport to 5.13.y] io_uring: Fix race condition when sqp thread goes to sleep
2021-07-25 5:07 [PATCH io_uring backport to 5.13.y] io_uring: Fix race condition when sqp thread goes to sleep Olivier Langlois
@ 2021-07-25 19:10 ` Jens Axboe
2021-07-26 7:42 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Jens Axboe @ 2021-07-25 19:10 UTC (permalink / raw)
To: Olivier Langlois, Pavel Begunkov, io-uring, linux-kernel, stable,
gregkh
On 7/24/21 11:07 PM, Olivier Langlois wrote:
> [ Upstream commit 997135017716 ("io_uring: Fix race condition when sqp thread goes to sleep") ]
>
> If an asynchronous completion happens before the task is preparing
> itself to wait and set its state to TASK_INTERRUPTIBLE, the completion
> will not wake up the sqp thread.
Looks good to me - Greg, would you mind queueing this one up?
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH io_uring backport to 5.13.y] io_uring: Fix race condition when sqp thread goes to sleep
2021-07-25 19:10 ` Jens Axboe
@ 2021-07-26 7:42 ` Greg KH
0 siblings, 0 replies; 3+ messages in thread
From: Greg KH @ 2021-07-26 7:42 UTC (permalink / raw)
To: Jens Axboe
Cc: Olivier Langlois, Pavel Begunkov, io-uring, linux-kernel, stable
On Sun, Jul 25, 2021 at 01:10:22PM -0600, Jens Axboe wrote:
> On 7/24/21 11:07 PM, Olivier Langlois wrote:
> > [ Upstream commit 997135017716 ("io_uring: Fix race condition when sqp thread goes to sleep") ]
> >
> > If an asynchronous completion happens before the task is preparing
> > itself to wait and set its state to TASK_INTERRUPTIBLE, the completion
> > will not wake up the sqp thread.
>
> Looks good to me - Greg, would you mind queueing this one up?
>
Now queued up, thanks!
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-07-25 5:07 [PATCH io_uring backport to 5.13.y] io_uring: Fix race condition when sqp thread goes to sleep Olivier Langlois
2021-07-25 19:10 ` Jens Axboe
2021-07-26 7:42 ` Greg KH
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