linux-kernel - Re: WARNING: at kernel/sched.c:4440 sub_preempt

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Message-Id: <200901151754.58311.nickpiggin@yahoo.com.au>
Date:	Thu, 15 Jan 2009 17:54:57 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Michal Hocko <mhocko@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: WARNING: at kernel/sched.c:4440 sub_preempt_count+0x81/0x95()

On Tuesday 13 January 2009 23:34:25 Ingo Molnar wrote:
> * Michal Hocko <mhocko@...e.cz> wrote:
> > Hi,
> > I am not sure whether someone has already reported this, but
> > I can see the following early boot WARNING with the 2.6.29-rc1 kernel in
> > the serial console output:
> >
> > ------------[ cut here ]------------
> > WARNING: at kernel/sched.c:4440 sub_preempt_count+0x81/0x95()
>
> That one should be fixed in tip/master and it is in the to-Linus queue of
> fixes:
>
>   http://people.redhat.com/mingo/tip.git/README
> 	
> it's this commit:
>
>   01e3eb8: Revert "sched: improve preempt debugging"
>
> if you want to cherry-pick the fix.

OK, but I still don't think this is the actual problem, but there is
something amiss in the init code being exposed by it.

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