linux-kernel - Re: [PATCH] Avoid a NULL pointer in btrfs

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Message-ID: <4D3829E7.9050305@gmail.com>
Date:	Thu, 20 Jan 2011 20:26:15 +0800
From:	Liuwenyi <qingshenlwy@...il.com>
To:	Chris Mason <chris.mason@...cle.com>
CC:	Josef Bacik <josef@...hat.com>, strongzgy <strongzgy@...il.com>,
	onlyflyer <onlyflyer@...il.com>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ak <ak@...ux.intel.com>, akpm <akpm@...ux-foundation.org>,
	miaox <miaox@...fujitsu.com>,
	Yang Ruirui <ruirui.r.yang@...to.com>,
	meego-kernel <meego-kernel@...go.com>
Subject: Re: [PATCH] Avoid a NULL pointer in btrfs

于 2011-1-19 23:52, Chris Mason 写道:
> Excerpts from Josef Bacik's message of 2011-01-19 09:14:02 -0500:
>> On Wed, Jan 19, 2011 at 10:08:13PM +0800, Liuwenyi wrote:
>>> In Yang Ruirui's mail, the btrfs will create a oops. This is caused by a
>>> null pointer in test_range_bit() while lock the spinlock.
>>>
>>> So, It is necessary to add a pointer check into test_range_bit()
>>>
>>
>> NAK, the tree shouldn't be null coming into this function, something else is
>> going wrong.  What oops is this?  Thanks,
The mail is here http://lkml.org/lkml/2011/1/19/24

another mesg is here http://www.aei.mpg.de/~crmafra/dmesg-2.6.35.3.txt
> What was your metadata blocksize for this oops?  This call should never
> happen.
It is rare and hard to reproduced. So, I update this patch, just avoid a 
null pointer calling.
> I think there is a larger problem, probably in the IO error handling
> code since the trace had io errors beforehand.
Yes, I agree. This situation is too strange to happen.
> -chris
---
Best Regards,
Liu Wenyi
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