From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <chris.mason@oracle.com>
Subject: Re: Updated performance results
Date: Wed, 16 Sep 2009 14:07:19 -0400
Message-ID: <20090916180719.GE2641@think>
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Cc: Eric Whitney <eric.whitney@hp.com>,
	linux-btrfs <linux-btrfs@vger.kernel.org>
To: Steven Pratt <slpratt@austin.ibm.com>
Return-path: <linux-btrfs-owner@vger.kernel.org>
In-Reply-To: <4AB12702.30601@austin.ibm.com>
List-ID: <linux-btrfs.vger.kernel.org>

On Wed, Sep 16, 2009 at 12:57:22PM -0500, Steven Pratt wrote:
> Steven Pratt wrote:
> >Chris Mason wrote:
> >>On Mon, Sep 14, 2009 at 04:41:48PM -0500, Steven Pratt wrote:
> >>>Only bit of bad news is I did get one error that crashed the system
> >>>on single threaded nocow run. So that data point is missing.
> >>>Output below:
> >>
> >>I hope I've got this fixed.  If you pull from the master branch of
> >>btrfs-unstable there are fixes for async thread races.  The single
> >>patch I sent before is included, but not enough.
> >Glad you said that.  Keeps me from sending the email that said the
> >patch didn't help :-)
> >
> >Steve
> Well, still getting oopses even with new code.
> 
> Lots of:
> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] BUG: soft lockup -
> CPU#10 stuck for 61s! [btrfs-endio-1:30250]
> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] Pid: 30250, comm:
> btrfs-endio-1 Not tainted 2.6.31-autokern1 #1 IBM x3950-[88726RU]-
> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] RIP:
> 0010:[<ffffffff81153920>]  [<ffffffff81153920>] crc32c+0x20/0x26

If I'm reading this right, you've got a softlockup in crc32c?  Something
has gone really wrong here.  Are you reusing datasets from old runs?

-chris