Re: [BUG][6.15][perf] Kernel panic not syncing: Fatal exception in interrupt

[Yeoreum Yun]

Hi David,

> Before I start testing, I feel concerned about following chain:
>
> ./kernel/fork.c:
> bad_fork_cleanup_perf:
>     perf_event_free_task()
>         perf_free_event()
>             list_del_event()
>
> This patch seems changes the behavior in this callchain.
> Would this have other side-effect?

What behavior is changed you're worry about?
both error patch is handled by __perf_remove_from_context(),
There wouldn't be no problem since this patch just move the
time of disabling cgroup before changing event state.

also, the cgroup event is for only cpuctx not added in taskctx.
So, there's no effect for event attached in taskctx.

Thanks.

--
Sincerely,
Yeoreum Yun