Re: [patch] hrtimers debug patch

Michal Piotrowski
2007-04-06T15:27:16Z

Hi all,

On 26/03/07, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
>
> > Stardust is down, console log and config attached.
>
> thanks! I have stared at hrtimer.c a few more hours and the good news is
> that i found a narrow SMP race. The bad news is that i dont think it
> could explain your bug symptoms: the worst-case effect of the race
> should be an incorrect timeout on the current CPU - not a KTIME_MAX
> thing like your logs show.
>
> But maybe i didnt think through the effects of the bug well enough, and
> your box has a HT CPU, with HT CPUs being pretty good at triggering
> narrow SMP races - so maybe we are lucky? Fix attached below. Patch is
> build and boot-tested.
>

I didn't see this weird hang for 12 days. I think that this patch
solves this issue.

Huge thans!

Regards,
Michal

--
Michal K. K. Piotrowski
LTG - Linux Testers Group (PL)
(http://www.stardust.webpages.pl/ltg/)
LTG - Linux Testers Group (EN)
(http://www.stardust.webpages.pl/linux_testers_group_en/)