linux-kernel - Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

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Message-ID: <20130418173811.GF4816@kernel.dk>
Date:	Thu, 18 Apr 2013 10:39:00 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Wanlong Gao <gaowanlong@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung@...il.com>,
	Alasdair G Kergon <agk@...hat.com>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	Neil Brown <neilb@...e.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

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@...nel.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

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