From: Adrian von Bidder <avbidder@fortytwo.ch>
To: Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>
Subject: Re: task imap:2958 blocked for more than 120 seconds
Date: Mon, 11 Jan 2010 08:34:36 +0100
User-Agent: KMail/1.12.4 (Linux/2.6.31-1-686; KDE/4.3.4; i686; ; )
Cc: Chris Mason <chris.mason@oracle.com>, linux-btrfs@vger.kernel.org,
       linux-kernel@vger.kernel.org
References: <201001102105.47192.johannes.hirte@fem.tu-ilmenau.de>
In-Reply-To: <201001102105.47192.johannes.hirte@fem.tu-ilmenau.de>
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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=20
exact same code path or not.

"btrfs-vol -b" on an 2T btrfs fs (raid 1 mode over 4 disks) on an arm CPU=20
has triggered it several times, so it seems a reliable way to reproduce=20
this.

Unfortunately log rotation has already killed the messages.  Do you want me=
=20
to re-run?  2.6.32 kernel, btrfs-progs from git about 4 weeks ago.


cheers
=2D- vbi


=2D-=20
Place stamp here.

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