Re: [BUG] during balance operation, WARNING: at fs/btrfs/relocation.c:1624 replace_file_extents+0x74b/0x7e0 [btrfs]()

[Chris Mason <chris.mason@fusionio.com>]

On Tue, Mar 05, 2013 at 04:59:05AM -0700, Stefan Behrens wrote:
> On Mon, 4 Mar 2013 14:31:37 -0500, Chris Mason wrote:
> > On Mon, Mar 04, 2013 at 10:24:39AM -0700, Stefan Behrens wrote:
> >> Just ran the following command sequence and got lots of WARNINGs.
> >> The issue is reproducible.
> >> The box was running the cmason/for-linus that made it into Linux 3.9 RC1.
> >>
> >> #!/bin/sh
> >> mkfs.btrfs -f /dev/sdl /dev/sdk -m raid1 -d raid1 -l 16384
> >> mount /dev/sdl /mnt
> >> dd if=/dev/urandom of=/mnt/urandom.1GB bs=10M count=100 &
> >> dd if=/dev/zero of=/mnt/zero.4GB bs=10M count=400 &
> >> (cd ~/kernel-src; tar cf - fs) | (cd /mnt && tar xf -)
> >> wait
> >>
> >> ((cd ~/kernel-src; tar cf - drivers) | (cd /mnt && tar xf -)) &
> >> sleep 5
> >> btrfs fi balance start /mnt
> > 
> > This doesn't look new, are you able to trigger it with an older kernel?
> > 
> 
> git bisect identifies the following post v3.8 commit to be the one:

Is your dd running fallocate?  Trying to figure out how this is related.

-chris