linux-kernel - Re: [patch] hrtimers debug patch

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Message-ID: <6bffcb0e0704060827l73aeb8ehf35d80f7630f2ac5@mail.gmail.com>
Date:	Fri, 6 Apr 2007 17:27:11 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Nick Piggin" <npiggin@...e.de>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Mingming Cao" <cmm@...ibm.com>, "Adrian Bunk" <bunk@...sta.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Mariusz Kozlowski" <m.kozlowski@...land.pl>,
	"Oliver Pinter" <oliver.pntr@...il.com>,
	"Sid Boyce" <g3vbv@...eyonder.co.uk>,
	"Jens Axboe" <jens.axboe@...cle.com>
Subject: Re: [patch] hrtimers debug patch

Hi all,

On 26/03/07, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Michal Piotrowski <michal.k.k.piotrowski@...il.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/)
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