root@dell:~# btrfs fi balance start -dconvert=single / Segmentation fault

gistfile1.txt

[  326.259124] ------------[ cut here ]------------
[  326.259172] kernel BUG at /home/apw/COD/linux/fs/btrfs/volumes.c:2788!
[  326.259220] invalid opcode: 0000 [#1] SMP 
[  326.259257] Modules linked in: zram(C) rfcomm bnep bluetooth snd_hda_codec_analog binfmt_misc snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi i915 snd_rawmidi psmouse snd_seq_midi_event snd_seq drm_kms_helper drm snd_timer i2c_algo_bit snd_seq_device snd dcdbas coretemp ppdev soundcore snd_page_alloc microcode serio_raw parport_pc video mei(C) mac_hid lp parport ses enclosure usbhid hid uas usb_storage e1000e btrfs zlib_deflate libcrc32c
[  326.259663] 
[  326.259678] Pid: 3266, comm: btrfs Tainted: G         C   3.4.4-030404-generic #201206221555 Dell Inc. OptiPlex 755                 /0GM819
[  326.259777] EIP: 0060:[<f873fc7a>] EFLAGS: 00010246 CPU: 0
[  326.259840] EIP is at btrfs_balance+0x55a/0x560 [btrfs]
[  326.259878] EAX: ffffff00 EBX: ffffffef ECX: 00000052 EDX: f714645c
[  326.259923] ESI: dbdd7a00 EDI: 00000000 EBP: d55a7ee8 ESP: d55a7ea0
[  326.259967]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  326.260006] CR0: 8005003b CR2: b73911a8 CR3: 155da000 CR4: 000007f0
[  326.260006] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[  326.260006] DR6: ffff0ff0 DR7: 00000400
[  326.260006] Process btrfs (pid: 3266, ti=d55a6000 task=e12971a0 task.ti=d55a6000)
[  326.260006] Stack:
[  326.260006]  d55a7eb8 dbdd6000 dbdd7a00 d55a7ee8 c11399d1 00000100 00000000 00000000
[  326.260006]  0000ffff 00000018 00010000 00010000 00000200 f42c4000 f7146000 f7146000
[  326.260006]  f42c41a8 dbdd7b9c d55a7f10 f874680b dbdd7a00 f714690c f71463ac bfa6b400
[  326.260006] Call Trace:
[  326.260006]  [<c11399d1>] ? kmem_cache_alloc_trace+0x111/0x140
[  326.260006]  [<f874680b>] btrfs_ioctl_balance.isra.50+0x10b/0x370 [btrfs]
[  326.260006]  [<f8747e47>] btrfs_ioctl+0x87/0x770 [btrfs]
[  326.260006]  [<f8747dc0>] ? update_ioctl_balance_args+0x2c0/0x2c0 [btrfs]
[  326.260006]  [<c1159cbf>] do_vfs_ioctl+0x7f/0x2f0
[  326.260006]  [<c1159f9f>] sys_ioctl+0x6f/0x80
[  326.260006]  [<c15c231f>] sysenter_do_call+0x12/0x28
[  326.260006] Code: e6 c8 e9 09 fb ff ff 66 c7 07 00 00 83 ea 02 83 c7 02 e9 78 fe ff ff c6 07 00 8b 7d ec 66 ba ff 03 83 c7 01 e9 5a fe ff ff 0f 0b <0f> 0b 8d 74 26 00 55 89 e5 83 ec 14 89 5d f4 89 75 f8 89 7d fc 
[  326.260006] EIP: [<f873fc7a>] btrfs_balance+0x55a/0x560 [btrfs] SS:ESP 0068:d55a7ea0
[  326.349428] ---[ end trace 2b3d5755ed3ffa59 ]---