From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <chris.mason@oracle.com>
Subject: Re: kernel BUG at fs/btrfs/extent_io.c:3982!
Date: Tue, 10 Apr 2012 16:24:40 -0400
Message-ID: <20120410202440.GZ29506@shiny>
References: <4F848C62.6030100@sandia.gov>
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Cc: linux-btrfs@vger.kernel.org
To: Jim Schutt <jaschut@sandia.gov>
Return-path: <linux-btrfs-owner@vger.kernel.org>
In-Reply-To: <4F848C62.6030100@sandia.gov>
List-ID: <linux-btrfs.vger.kernel.org>

On Tue, Apr 10, 2012 at 01:39:14PM -0600, Jim Schutt wrote:
> Hi,
> 
> I hit this BUG today.
> 
> I'm running 3.3.1 merged with the ceph and btrfs bits for 3.4,
> i.e. 3.3.1 +
>   commit bc3f116fec194 "Btrfs: update the checks for mixed block groups with big metadata blocks"
>   commit c666601a935b9 "rbd: move snap_rwsem to the device, rename to header_rwsem"
> 
> The btrfs filesystem in question is backing a Ceph OSD under
> a heavy write load.
> 
> Here's the bug:
> 
> [510342.517157] ------------[ cut here ]------------
> [510342.521855] kernel BUG at fs/btrfs/extent_io.c:3982!

Could you please confirm that line number is this BUG_ON()

        BUG_ON(extent_buffer_under_io(eb));

Josef has a theory on this one, but I want to make sure we're chasing
the right thing.

-chris