Re: commit 894d1b3db41c leads to frequent hangs when booting

[John Stultz]

On Wed, Dec 11, 2024 at 2:46 PM Bert Karwatzki <spasswolf@xxxxxx> wrote:
>
> Am Mittwoch, dem 11.12.2024 um 22:35 +0100 schrieb Bert Karwatzki:
> > I have confirmed that I that linux-next-20241210 is fixed by the same revert
> > as v6.13-rc2 (ten boots without incident is the criterion for a good commit)
> >
> >
> > Bert Karwatzki
>
> Also this bug only occurs with CONFIG_PREEMPT_RT=y, I've just checked v6.13-rc2
> without the revert and the following preempt settings and got 10 clean boots:
>

Hrm. That matches the case where the fix here helped:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f9cc094975240885c93effbca7f4603f5de1bf


I'm still working on getting a minimal delta from your config booting
in my environment, but in the meantime, I'd be curious if the
following reduced revert helps?
  https://github.com/johnstultz-work/linux-dev/commit/60c60f85670fb1f4708adbe55e15ab918d96f9f0

Basically just trying to clarify if the problem is moving the wakeup
to the wake_q or if some other interaction (maybe with the
preempt_disables) could be causing the issue.
(I'm assuming you have 82f9cc094975 applied when you test with that change)

thanks
-john