linux-kernel - Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched

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Message-ID: <20101222233956.GE10557@genesis.frugalware.org>
Date:	Thu, 23 Dec 2010 00:39:56 +0100
From:	Miklos Vajna <vmiklos@...galware.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	shenghui <crosslonelyover@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] avoid race condition in pick_next_task_fair in
 kernel/sched_fair.c

On Wed, Dec 22, 2010 at 10:11:51PM +0100, Miklos Vajna <vmiklos@...galware.org> wrote:
> I reported the issue as I tested 2.6.36 and 2.6.37-rc6 and both failed.
> Now I tried current -git and indeed I can't reproduce the issue there.
> 
> I'm now bisecting between master and rc6 to see which commit fixes the
> problem - just to make sure it's not something irrelevant and the bug is
> still hidden somewhere.

I spoke too early. After some trying, it seems I can reproduce with
current -git as well. (But as Peter points out it's harder to
reproduce.)

Just in case it's interesting, I attached the -git dmesg. From a quick
look the trace is the same as with v2.6.36, which is easy to reproduce.

View attachment "dmesg.txt" of type "text/plain" (21247 bytes)

Content of type "application/pgp-signature" skipped