Re: Regressionhung task during raid rebuild 2.6.33 rc5 was: Re:2.6.33RC3 hung task - jbd2/dm-1-8 (during raid rebuild)

From: Michael Breuer
Date: Sat Jan 30 2010 - 15:00:20 EST

On 1/30/2010 2:57 PM, Rafael J. Wysocki wrote:
On Saturday 30 January 2010, 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

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
Is this the bug tracked as ?

Yes - although the behavior is different on rc5 vs. rc3. I think it's the same.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at