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

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Date:	Sat, 30 Jan 2010 14:26:51 -0500
From:	Michael Breuer <mbreuer@...jas.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Regression: hung task during raid rebuild 2.6.33 rc5 was: Re:
 2.6.33RC3 hung task - jbd2/dm-1-8 (during raid rebuild)

On 1/30/2010 2:21 PM, Michael Breuer wrote:
> 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.
Also - when I attempted to reboot, I got the following (only on an ssh 
terminal window - nothing in dmesg or log after reboot):

Message from syslogd@...l at Jan 30 14:16:42 ...
  kernel:------------[ cut here ]------------

Message from syslogd@...l at Jan 30 14:16:42 ...
  kernel:invalid opcode: 0000 [#1] SMP

Message from syslogd@...l at Jan 30 14:16:42 ...
  kernel:last sysfs file: /sys/devices/virtual/block/md0/size

Message from syslogd@...l at Jan 30 14:16:42 ...
  kernel:Stack:

Message from syslogd@...l at Jan 30 14:16:42 ...
  kernel:Call Trace:

Message from syslogd@...l at Jan 30 14:16:42 ...
  kernel:Code: 41 5f c9 c3 55 48 89 e5 41 55 41 54 53 48 83 ec 38 0f 1f 
44 00 00 48 89 fb f6 46 20 01 0f 84 26 01 00 00 8b 47 38 83 f8 01 75 04 
<0f> 0b eb fe 45 31 e4 83 f8 02 75 2a c7 47 38 00 00 00 00 f0 80

[ends here]
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