/ # rm -rf /mnt/btr/var_tmp/paludis/dev-lang-jhc-9999/
[   53.270000] BUG: failure at /mnt/archive/src/linux-2.6/fs/btrfs/inode.c:2962/btrfs_unlink()!
[   53.270000] Kernel panic - not syncing: BUG!
[   53.270000] Call Trace: 
[   53.270000] 7fc9bc78:  [<601acc8e>] panic+0xea/0x1dc
[   53.270000] 7fc9bc98:  [<601ace20>] printk+0xa0/0xa8
[   53.270000] 7fc9bcf8:  [<600b80f2>] btrfs_free_path+0x2a/0x2f
[   53.270000] 7fc9bd48:  [<600daac7>] btrfs_unlink_inode+0x1b/0x3b
[   53.270000] 7fc9bd78:  [<600dabab>] btrfs_unlink+0xc4/0xee
[   53.270000] 7fc9bdb8:  [<6007ef54>] vfs_unlink+0x55/0x8e
[   53.270000] 7fc9bde8:  [<6007f055>] do_unlinkat+0xc8/0x156
[   53.270000] 7fc9be48:  [<6007746a>] sys_newlstat+0x29/0x34
[   53.270000] 7fc9bec8:  [<6007f11a>] sys_unlink+0x11/0x13
[   53.270000] 7fc9bed8:  [<600171dc>] handle_syscall+0x50/0x70
[   53.270000] 7fc9bef8:  [<60021aa9>] userspace+0x30f/0x3c9
[   53.270000] 7fc9bf58:  [<60001721>] kernel_init+0x0/0x103
[   53.270000] 7fc9bfc8:  [<60014955>] new_thread_handler+0x8d/0x9b
[   53.270000] 
[   53.270000] 
[   53.270000] Pid: 1, comm: busybox Not tainted 2.6.39-rc2+
[   53.270000] RIP: 0033:[<00000000005443a7>]
[   53.270000] RSP: 0000007fbfec0238  EFLAGS: 00000246
[   53.270000] RAX: ffffffffffffffda RBX: 00000000008536c0 RCX: ffffffffffffffff
[   53.270000] RDX: 0000007fbfec0240 RSI: 0000007fbfec0240 RDI: 00000000008536c0
[   53.270000] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   53.270000] R10: 7263616d2d63612f R11: 0000000000000246 R12: 0000000000000000
[   53.270000] R13: 0000000040001010 R14: 00000000008536c0 R15: 00000000ffffffff
[   53.270000] Call Trace: 
[   53.270000] 7fc9bbf8:  [<60016ce9>] panic_exit+0x2f/0x45
[   53.270000] 7fc9bc18:  [<60043571>] notifier_call_chain+0x5f/0x96
[   53.270000] 7fc9bc68:  [<60043647>] atomic_notifier_call_chain+0xf/0x11
[   53.270000] 7fc9bc78:  [<601acca9>] panic+0x105/0x1dc
[   53.270000] 7fc9bc98:  [<601ace20>] printk+0xa0/0xa8
[   53.270000] 7fc9bcf8:  [<600b80f2>] btrfs_free_path+0x2a/0x2f
[   53.270000] 7fc9bd48:  [<600daac7>] btrfs_unlink_inode+0x1b/0x3b
[   53.270000] 7fc9bd78:  [<600dabab>] btrfs_unlink+0xc4/0xee
[   53.270000] 7fc9bdb8:  [<6007ef54>] vfs_unlink+0x55/0x8e
[   53.270000] 7fc9bde8:  [<6007f055>] do_unlinkat+0xc8/0x156
[   53.270000] 7fc9be48:  [<6007746a>] sys_newlstat+0x29/0x34
[   53.270000] 7fc9bec8:  [<6007f11a>] sys_unlink+0x11/0x13
[   53.270000] 7fc9bed8:  [<600171dc>] handle_syscall+0x50/0x70
[   53.270000] 7fc9bef8:  [<60021aa9>] userspace+0x30f/0x3c9
[   53.270000] 7fc9bf58:  [<60001721>] kernel_init+0x0/0x103
[   53.270000] 7fc9bfc8:  [<60014955>] new_thread_handler+0x8d/0x9b