Public bug reported:

After booting kubuntu-alpha3 from USB, and running the installer the
kernel reports

kernel BUG at /build/builddd/linux-3.0.0/fs/btrfs/super.c:984
Invalid opcode: 0000 [#1] SMP
EIP is at btrfs_calc_avail_data_space + 0x375/0x380

call trace: 
? kmem_cache_alloc +0x11d/0x140
? __btrfs_get_ro_block_group_free_space +0xb0/0xe0
? btrfs_account_ro_block_groups_free_space
btrfs_statfs
statfs_by_dentry
...
syscall

I do have some btrfs partitions on the hard disk (created using Ubuntu
11.04) but none were mounted at the time the installer was run.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/829142

Title:
  kernel BUG in btrfs during kubuntu install

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