linux-kernel - Re: btrfs soft lockups: locks gone crazy

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Date:	Fri, 17 Oct 2014 13:08:05 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Josef Bacik <jbacik@...com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-btrfs@...r.kernel.org
Subject: Re: btrfs soft lockups: locks gone crazy

On Fri, 2014-10-17 at 15:33 -0400, Josef Bacik wrote:
> On 10/14/2014 03:27 AM, Davidlohr Bueso wrote:
> > Hello,
> >
> > I'm getting massive amounts of cpu soft lockups in Linus's tree for
> > today. This occurs almost immediately and is very reproducible in aim7
> > disk workloads using btrfs:
> >
> 
> I'm trying to reproduce but it's not popping for me.  What is the setup 
> of your fs?  mkfs options, mount options etc.  And how are you running 
> aim7?  I'm using reaim with the default reaim.config and workfile,disk, 
> is this what you are using?  If not please attach your config and 
> workfile so I can be sure to be doing the same thing as you.  Thanks,

The steps I used are:

Download mmtests: https://github.com/gormanm/mmtests.git

cp configs/config-global-dhp__reaim-io config

edit the new config and just leave 'workfile.shared workfile.disk'
workloads as the REAIM_WORKFILES parameter.

./run-mmtests --no-monitor testname

Just a few mins into the test you should start getting the lockups. fwiw
I have not had the time to try other setups of reaim that are not
bundled with mmtests.

Thanks,
Davidlohr

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