linux-kernel - Regressionhung task during raid rebuild 2.6.33 rc5 was: Re: 2.6.33RC3 hung task

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Date:	Sat, 30 Jan 2010 14:21:11 -0500
From:	Michael Breuer <mbreuer@...jas.com>
To:	linux-kernel@...r.kernel.org
Subject: Regressionhung task during raid rebuild 2.6.33 rc5 was: Re: 2.6.33RC3
 hung task - jbd2/dm-1-8 (during raid rebuild)

On 1/10/2010 4:47 PM, Michael Breuer wrote:
> System crashed (watchdog reset).
>
> Was doing a raid rebuild at the time (raid6).
>
> I typed, 'yumdownloader --source virtlib' ... system froze, then 
> rebooted on the watchdog reset.
>
> I've attached the log extract from the event as well as dmesg.
>
>
Hit this again - system doesn't crash now - just get the hung task 
warning (log extract attached). System seems to keep running (albeit the 
rebuild is incredibly slow on 2.6.33 rc5 - approx 6500K/sec vs. about 
80,000K/sec on 2.6.32.4.

Looks like it may be triggered by disk io during the rebuild. This time 
I had typed, "sync." "sync" hung for a long while but did eventually 
complete.

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