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

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Message-ID: <604427e00904091359t3e068ffm1868d164824fb575@mail.gmail.com>
Date:	Thu, 9 Apr 2009 13:59:50 -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 1:30 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.

--Ying
>
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