linux-kernel - Re: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation and remove stats

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Date:	Sun, 26 Feb 2012 07:21:13 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, hughd@...gle.com, avi@...hat.com, nate@...nel.net,
	cl@...ux-foundation.org, linux-kernel@...r.kernel.org,
	dpshah@...gle.com, ctalbott@...gle.com, rni@...gle.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation
 and remove stats_lock

On Sun, Feb 26, 2012 at 06:46:41AM +0900, Tejun Heo wrote:
> Hello,
> 
> On Fri, Feb 24, 2012 at 10:44:32PM -0500, Vivek Goyal wrote:
> > Booting with blkcg-stacking branch and changing io scheduler from cfq to
> > deadline oopsed.
> > 
> > login: [   67.382768] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
> > [   67.383037] CPU 1 
> > [   67.383037] Modules linked in: floppy [last unloaded: scsi_wait_scan]
> > [   67.383037] 
> > [   67.383037] Pid: 4763, comm: bash Not tainted 3.3.0-rc3-tejun-misc+ #6 Hewlett-Packard HP xw6600 Workstation/0A9Ch
> > [   67.383037] RIP: 0010:[<ffffffff81311793>]  [<ffffffff81311793>] cfq_put_queue+0xb3/0x1d0
> 
> Hmmm... weird.  Looking into it.  I'm away from office for a week and
> will probably be slow.

It won't reproduce here.  Can you please explain how to trigger it?
Can you please also run addr2line on the oops address?

Thanks.

-- 
tejun
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