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Date: Thu, 18 Apr 2013 10:39:00 -0700
From: Jens Axboe <axboe@kernel.dk>
To: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Wanlong Gao <gaowanlong@cn.fujitsu.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Namhyung Kim <namhyung@gmail.com>, Alasdair G Kergon <agk@redhat.com>,
        "dm-devel@redhat.com" <dm-devel@redhat.com>,
        Neil Brown <neilb@suse.de>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7
Message-ID: <20130418173811.GF4816@kernel.dk>
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On Thu, Apr 18 2013, Tejun Heo wrote:
> Hello,
> 
> On Thu, Apr 18, 2013 at 09:08:34AM -0700, Linus Torvalds wrote:
> > On Thu, Apr 18, 2013 at 7:30 AM, Jens Axboe <axboe@kernel.dk> wrote:
> > >
> > > Could you capture the full dump? I'd like to see what rcx was, and that
> > > seems to have scrolled off.
> > 
> > You don't need it. The %cr2 value shows the address of the bad access,
> > and it's 0x00000001.
> 
> If I'm not mistaken, it seems like we have a bio which has 1 as its
> ->bi_bdev.  Ummm.... no idea whatsoever how that can happen tho right
> now.  Looking into it.

Yep, thanks Linus for that hint... Must be someone abusing it for a
flag field post submission? Crazy.

-- 
Jens Axboe