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Date:	Thu, 3 Jan 2013 16:00:46 -0500
From:	Josh Boyer <jwboyer@...hat.com>
To:	Ed Cashin <ecashin@...aid.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"mitko@...ksoft-bg.com" <mitko@...ksoft-bg.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-team@...oraproject.org" <kernel-team@...oraproject.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Oops on aoe module removal

On Thu, Jan 03, 2013 at 02:50:46PM -0600, Ed Cashin wrote:
> >>> The blk_alloc_queue has already done a bdi_init, so do not bdi_init again in
> >>> aoeblk_gdalloc.
> >>> 
> >>> The patch below applies to v3.5.6, with its v47 aoe driver.  On my system it
> >>> eliminates the list_del corruption messages.
> >> 
> >> Since the patch doesn't apply to current -git, does the problem not
> >> exist there?
> > 
> > The original post is about an older kernel with the v47 aoe driver.  The current mainline has a v81 aoe driver, so the patch for v3.5.6 isn't expected to apply to the mainline.
> > 
> > I'm currently investigating the state of the mainline with relation to this issue.
> 
> I don't see the extra call to bdi_init in aoe driver v81 in the mainline git tree, and
> I don't see the symptoms under discussion, either, when performing the same 
> test steps.
> 
> Kernels with aoe v47 can use the patch I just posted.
> 
> I'm going to go through the stable kernels and check, but I believe kernels after
> v47 but before commit 0a41409c5180 should apply the fix in 0a41409c5180:
> 
>   commit 0a41409c518083133e79015092585d68915865be
>   Author: Ed Cashin <ecashin@...aid.com>
>   Date:   Mon Dec 17 16:03:58 2012 -0800
>   
>       aoe: remove vestigial request queue allocation
> 
> Josh, can you confirm that the patch I posted in this thread today works for 
> your customer?

Sure.  I'll get a test kernel built with that patch and ask them to
test.

josh
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