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To: Dave Jones <davej@redhat.com>
From: Chris Mason <chris.mason@fusionio.com>
In-Reply-To: <20130619183450.GA26752@redhat.com>
CC: Linux Kernel <linux-kernel@vger.kernel.org>, <linux-btrfs@vger.kernel.org>
References: <20130617134955.GB15861@redhat.com>
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 <20130617182005.GA9839@redhat.com>
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 <20130619183450.GA26752@redhat.com>
Message-ID: <20130619184219.5430.47901@localhost.localdomain>
User-Agent: alot/0.3.4
Subject: Re: [3.10-rc6] WARNING: at fs/btrfs/inode.c:7961
 btrfs_destroy_inode+0x265/0x2e0 [btrfs]()
Date: Wed, 19 Jun 2013 14:42:19 -0400
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1886
Lines: 44

Quoting Dave Jones (2013-06-19 14:34:50)
> On Wed, Jun 19, 2013 at 02:02:33PM -0400, Chris Mason wrote:
>  > Quoting Dave Jones (2013-06-17 14:58:10)
>  > > On Mon, Jun 17, 2013 at 02:42:27PM -0400, Chris Mason wrote:
>  > >  > Quoting Dave Jones (2013-06-17 14:20:06)
>  > >  > > On Mon, Jun 17, 2013 at 01:39:42PM -0400, Chris Mason wrote:
>  > >  > >  > Quoting Dave Jones (2013-06-17 09:49:55)
>  > >  > >  > > Hit this while running this script in a loop..
>  > >  > >  > > https://github.com/kernelslacker/io-tests/blob/master/setup.sh
>  > >  > >  > > [34385.251507] ------------[ cut here ]------------
>  > >  > >  > > [34385.254068] WARNING: at fs/btrfs/inode.c:7961 btrfs_destroy_inode+0x265/0x2e0 [btrfs]()
>  > >  > >  > 
>  > >  > >  > Thanks Dave, how long did you have to run the script to trigger it?
>  > >  > > 
>  > >  > > Judging by the timestamp, about 9 hours.  This is on a 3 disk (sata)
>  > >  > > (oldish) quad opteron. Might repro faster on a more modern machine.
>  > >  > 
>  > >  > Exactly how did you run it?  I want to make sure I'm matching your
>  > >  > config.
>  > > 
>  > > while [ 1 ];
>  > > do
>  > >   setup.sh
>  > > done
>  > > 
>  > > You'll need to set DISK1 etc variables at the top of the script to point to
>  > > at least 3 disks for it to scribble over.
>  > > 
>  > > you'll also need fsx and fsstress in /usr/local/bin.
>  > 
>  > I've tried with and without memory pressure, and let it run for about 30
>  > hours.  So far, nothing here.  Have you seen this again?
> 
> yeah, one time I hit it within 30 minutes.

Ok, I'll try bumping the thread count on both fsstress and fsx

-chris

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