Hi Jens,
> Thanks for the bug report, and I really appreciate including a reproducer.
> Makes everything so much easier to debug.
Glad I could help :)
> Are you able to compile your own kernels? Would be great if you can try
> and apply this one on top of 5.15.6.
>
>
> diff --git a/fs/io-wq.c b/fs/io-wq.c
> index 8c6131565754..e8f77903d775 100644
> --- a/fs/io-wq.c
> +++ b/fs/io-wq.c
> @@ -711,6 +711,13 @@ static bool io_wq_work_match_all(struct io_wq_work *work, void *data)
>
> static inline bool io_should_retry_thread(long err)
> {
> + /*
> + * Prevent perpetual task_work retry, if the task (or its group) is
> + * exiting.
> + */
> + if (fatal_signal_pending(current))
> + return false;
> +
> switch (err) {
> case -EAGAIN:
> case -ERESTARTSYS:
With your patch on top of 5.15.6 I can no longer reproduce stuck processes.
Neither with our software nor with the reproducer.
I ran both a hundred times and both terminated immediately without unexpected CPU usage.
Tested-by: Florian Fischer <florian.fl.fischer@xxxxxx>
Florian Fischer
