linux-kernel - Re: 2.6.29-rc3: BUG: scheduling while atomic: udevd/917/0x10000100

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Message-Id: <1234342189.23438.113.camel@twins>
Date:	Wed, 11 Feb 2009 09:49:49 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29-rc3: BUG: scheduling while atomic: udevd/917/0x10000100

On Wed, 2009-02-11 at 09:32 +0100, Ingo Molnar wrote:

> There's a fourth possibility:
> 
>  - Given that it's udevd that does it - maybe we leaked a softirq preempt
>    count in some rare sysfs file, and it did not get discovered until the
>    next innocent piece of kernel code preempted?
> 
> But i thought lockdep would already warn if we exited a syscall with locks
> held or with a preempt count elevated - Peter?

>>From a quick look it only checks task->lockdep_depth, in
lockdep_sys_exit().



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