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From: Chris Mason <chris.mason@fusionio.com>
To: Sean Clarke <sean.clarke@sec-consulting.co.uk>,
        <linux-btrfs@vger.kernel.org>
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Message-ID: <20131024084756.14051.61595@localhost.localdomain>
Subject: Re: 3.11 and 3.12rc continual hard lock ups
Date: Thu, 24 Oct 2013 04:47:56 -0400
Sender: linux-btrfs-owner@vger.kernel.org
List-ID: <linux-btrfs.vger.kernel.org>

Quoting Sean Clarke (2013-10-23 15:26:15)
> Hi,
>    I have an Intel Core i7 based fileserver with 18TB BTRFS in a 6x
> 3TB RAID 1+0 configuration. The system was working fine running Ubuntu
> 13.04 (kernel 3.11.0-12-generic). The system was upgraded to Ubuntu
> 13.10 (kernel 3.11) and began to lock up daily, sometimes every couple
> of hours. Previously it never crashed and was only taken down for
> maintenance so a bug was files on launchpad
> (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1237794).

Does your kernel  config include the softlockup detector?  If you could
please do sysrq-w and sysrq-t while it is locked, it'll help us track it
down.

It will be much easier if you have a serial console or network console,
and you've increased your kernel logging level to the highest value
(dmesg -n7)

-chris