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

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Message-ID: <20101222211151.GB10557@genesis.frugalware.org>
Date:	Wed, 22 Dec 2010 22:11:51 +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 06:08:38PM +0100, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2010-12-22 at 16:14 +0100, Miklos Vajna wrote:
> > kernel-build is a git build using the config I already sent and after a
> > 'git checkout v2.6.36'. I can try to build master as well, so far what I
> > saw is that the bug occurs there as well, but less frequently, so maybe
> > that's a bit harder to debug. 
> 
> Right, so I've got v2.6.36 exploding, current -git and -tip won't
> explode for me, tried both about 20 times. So I'll try and figure out
> wth makes .36 explode and then see if further kernel still suffer that
> problem.

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.

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