Subject: Re: [PATCH] per-backing dev unplugging #2
From: Chris Mason <mason@suse.com>
To: Jens Axboe <axboe@suse.de>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@osdl.org>,
       kenneth.w.chen@intel.com
In-Reply-To: <20040311083619.GH6955@suse.de>
References: <20040311083619.GH6955@suse.de>
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Message-Id: <1079121113.4181.189.camel@watt.suse.com>
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Date: Fri, 12 Mar 2004 14:51:53 -0500
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On Thu, 2004-03-11 at 03:36, Jens Axboe wrote:
> Hi,
> 
> Final version, unless something stupid pops up. Changes:

During a mixed load test including fsx-linux and a bunch of procs
running cp/read/rm loops, I got a null pointer deref with the call
trace:

__lock_page->sync_page->block_sync_page

I don't see how we can trust page->mapping in this path, can't it
disappear?  If so, it would be a bug without Jens' patch too, just
harder to hit.

-chris


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