linux-ext4 - Re: [PATCH] ext2: Fix data corruption for racing writes

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Message-ID: <604427e00904101110j68e0bd31t885e5d60b8842d80@mail.gmail.com>
Date:	Fri, 10 Apr 2009 11:10:41 -0700
From:	Ying Han <yinghan@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, yinghan@...il.com,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH] ext2: Fix data corruption for racing writes

On Thu, Apr 9, 2009 at 1:59 PM, Ying Han <yinghan@...gle.com> wrote:
> On Thu, Apr 9, 2009 at 1:30 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> On Mon, 6 Apr 2009 12:23:29 +0200
>> Jan Kara <jack@...e.cz> wrote:
>>
>>> >
>>> > I tried this patch and seems i got deadlock on the truncate_mutex.
>>> > Here is the message after enabling lockdep. I pasted the same message
>>> > on the origianal thread.
>>>
>>> ...
>>>
>>>   I don't think this is a deadlock (or is the machine hung?). The thread
>>> was just waiting for a long time. I'd think that you'll occasionally get
>>> exactly the same message even without my patch if you stress the machine
>>> like you do.
>>>
>>
>> Well, it's easy to tell the difference
>>
>> deadlock: system never recovers
>> long-sucky-delay: system eventually recovers.
>>
>> Which was it??
> Guess i have to retest it. I didn't wait long enough to see what
> happened on the machine. However, i do see the machine got rebooted
> later, but i am not sure what is the reason it is got reboot.
>
> I will rerun the patch and keep an eye on it this time.

Ok, i rerun the patch and i don't see the message poping this time and
the machine is up healthy.

>
> --Ying
>>
>
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