Re: [PATCH] sched/fair: Fix inaccurate h_nr_runnable accounting with delayed dequeue

[K Prateek Nayak]

On 1/20/2025 2:14 PM, Madadi Vineeth Reddy wrote:
> > However, I was unable to trigger the WARN_ON by running hackbench in a
> > cgroup without the patch. Could you please share the specific test
> > scenario or configuration you used to reproduce it?
>
> My mistake: SCHED_WARN_ON is a WARN_ONCE, so I had to clear it before
> running hackbench to ensure the WARN_ON could be triggered again.

Yup! A WARN_ON() is hit very consistently.

> Now I am able to trigger the WARN_ON in the unpatched kernel while
> running hackbench after executing `echo 1 > /sys/kernel/debug/clear_warn_once`
> following the initial warning during the boot process. I have verified
> that the patched kernel fixes the issue.

Thank you again for testing the fix. Much appreciated!

> Thanks,
> Madadi Vineeth Reddy

--
Thanks and Regards,
Prateek