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

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Date:	Fri, 19 Apr 2013 14:30:04 +0800
From:	Wanlong Gao <gaowanlong@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Jens Axboe <axboe@...nel.dk>, 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,
	Wanlong Gao <gaowanlong@...fujitsu.com>
Subject: Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

On 04/19/2013 02:17 PM, 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.

Thank you for investigating this. And sorry for my incompleted panic picture
before that let you detour. :-(

Regards,
Wanlong Gao

> 
> Thanks.
> 

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