linux-kernel - Re: task imap:2958 blocked for more than 120 seconds

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Message-Id: <201001110834.36865@fortytwo.ch>
Date:	Mon, 11 Jan 2010 08:34:36 +0100
From:	Adrian von Bidder <avbidder@...tytwo.ch>
To:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>
Cc:	Chris Mason <chris.mason@...cle.com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: task imap:2958 blocked for more than 120 seconds

On Sunday 10 January 2010 21.05:46 Johannes Hirte wrote:
> I've observed this hanging task now several times. Not sure when this
>  started, but 2.6.32 is affected too, IIRC. I don't have a test pattern
>  for this. Dovecot imap triggers this from time to time. I've enabled
>  CONFIG_DETECT_HUNG_TASK now and got this two tasks which hang:

I've had vey similar hangs occasionally; don't remember if they were the 
exact same code path or not.

"btrfs-vol -b" on an 2T btrfs fs (raid 1 mode over 4 disks) on an arm CPU 
has triggered it several times, so it seems a reliable way to reproduce 
this.

Unfortunately log rotation has already killed the messages.  Do you want me 
to re-run?  2.6.32 kernel, btrfs-progs from git about 4 weeks ago.

cheers
-- vbi

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