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

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Message-ID: <20130419133016.GQ4816@kernel.dk>
Date:	Fri, 19 Apr 2013 06:31:36 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>
Cc:	Wanlong Gao <gaowanlong@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>, namhyung@...il.com,
	agk@...hat.com, dm-devel@...hat.com, neilb@...e.de,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <chris.mason@...ionio.com>,
	linux-btrfs@...r.kernel.org
Subject: Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

On Thu, Apr 18 2013, Tejun Heo wrote:
> On Thu, Apr 18, 2013 at 10:57:54PM -0700, Tejun Heo wrote:
> > No wonder this thing crashes.  Chris, can't the original bio carry
> > bbio in bi_private and let end_bio_extent_readpage() free the bbio
> > instead of abusing bi_bdev like this?
> 
> BTW, I think it's a bit too late to fix this properly from btrfs side
> unless we're gonna do -rc8, so let's revert the TP patch for now and
> sort this out in the next devel cycle.  AFAICS, while disturbingly
> (ha|yu)cky, the bi_bdev trick should be okay without the new TP.

The tracing commit was already backed out yesterday, so no problems
there. I figured it'd be a bit too late to fix something this nasty in a
suitably clean and straight forward fashion.

-- 
Jens Axboe

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