Re: [PATCH 00/24] Complete EEVDF

Peter Zijlstra
2024-08-22T15:55:17Z

On Wed, Aug 21, 2024 at 10:46:07AM +0100, Hongyan Xia wrote:
> Okay, in case the trace I provided isn't clear enough, I traced the crash to
> a call chain like this:
>
> dl_server_start()
> enqueue_dl_entity()
> update_stats_enqueue_dl()
> update_stats_enqueue_sleeper_dl()
> __schedstats_from_dl_se()
> dl_task_of() <---------- crash
>
> If I undefine CONFIG_SCHEDSTATS, then it boots fine, and I wonder if this is
> the reason why other people are not seeing this. This is probably not EEVDF
> but DL refactoring related.

Thanks for the report -- I'll see if I can spot something. Since you
initially fingered these eevdf patches, could you confirm or deny that
changing:

kernel/sched/features.h:SCHED_FEAT(DELAY_DEQUEUE, true)

to false, makes any difference in the previously failing case?