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Date: Wed, 23 Aug 2006 13:18:15 +0200
From: Olaf Hering <olaf@aepfle.de>
To: Shailabh Nagar <nagar@watson.ibm.com>
Cc: linux-kernel@vger.kernel.org, Balbir Singh <balbir@in.ibm.com>
Subject: Re: oops in __delayacct_blkio_ticks with 2.6.18-rc4
Message-ID: <20060823111815.GA11270@aepfle.de>
References: <20060821112405.GA28356@aepfle.de> <44EB5684.60002@watson.ibm.com>
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On Tue, Aug 22, Shailabh Nagar wrote:

> Olaf Hering wrote:
> > https://bugzilla.novell.com/show_bug.cgi?id=200526
> >
> 
> Thanks for detecting this.
> 
> I suspect the oops is caused by a reading of /proc/<tgid>/stat for some task
> that is late in exit. Currently tsk->delays is being freed up too early (before
> the tsk is removed from the tasklist).
> 
> Could you try the patch below ? It was unclear from the bug what userspace
> actions were being done to reproduce the oops - I suspect some kind of
> reading of /proc/.../stat for all processes ?

I dont have a way to trigger it. The commands were 'w' and 'pstree'.