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Re: kernel BUG at fs/btrfs/extent_io.c:3982!



On 04/10/2012 02:24 PM, Chris Mason wrote:
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));

Yep, that's definitely it:

git blame fs/btrfs/extent_io.c | grep -w 3982
0b32f4bb (Josef Bacik        2012-03-13 09:38:00 -0400 3982) 	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.

Great, thanks.  I'll be happy to test any patches, if needed.

-- Jim


-chris



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