I've constructed a reproduction case and have asked Vladimir (upstream) to have a look at it. It's currently here:
http://people.canonical.com/~cjwatson/tmp/btrfs-broken.img.xz
'grub-fstest `pwd`/btrfs-broken.img cp /@/boot/vmlinuz-2.6.38-8-generic-pae x' fails with this image, although Linux's btrfs driver seems to have no problems.
I've constructed a reproduction case and have asked Vladimir (upstream) to have a look at it. It's currently here:
http:// people. canonical. com/~cjwatson/ tmp/btrfs- broken. img.xz
'grub-fstest `pwd`/btrfs- broken. img cp /@/boot/ vmlinuz- 2.6.38- 8-generic- pae x' fails with this image, although Linux's btrfs driver seems to have no problems.