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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1235798

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1235798

Title:
  Kernel stops during btrfs-balance

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  [  208.335732] ------------[ cut here ]------------
  [  208.336386] Kernel BUG at ffffffffa014a167 [verbose debug info unavailable]
  [  208.337249] invalid opcode: 0000 [#1] SMP 
  [  208.337758] Modules linked in: dm_crypt(F) kvm_intel(F) kvm(F) aesni_intel(F) aes_x86_64(F) lrw(F) gf128mul(F) glue_helper(F) ablk_helper(F) cryptd(F) microcode(F) psmouse(F) serio_raw(F) virtio_balloon(F) i2c_piix4 mac_hid lp(F) parport(F) btrfs(F) xor(F) zlib_deflate(F) raid6_pq(F) libcrc32c(F) cirrus syscopyarea(F) sysfillrect(F) sysimgblt(F) ttm drm_kms_helper drm floppy(F)
  [  208.339602] CPU: 0 PID: 630 Comm: btrfs-balance Tainted: GF            3.11.0-11-generic #17-Ubuntu
  [  208.339602] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
  [  208.339602] task: ffff8800b47c9770 ti: ffff8800b3088000 task.ti: ffff8800b3088000
  [  208.339602] RIP: 0010:[<ffffffffa014a167>]  [<ffffffffa014a167>] build_backref_tree+0x277/0x11d0 [btrfs]
  [  208.339602] RSP: 0018:ffff8800b3089a90  EFLAGS: 00010246
  [  208.339602] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8800365ffb50
  [  208.339602] RDX: ffff8800b3089b00 RSI: ffff8800b3089b00 RDI: ffff8800365ffb40
  [  208.339602] RBP: ffff8800b3089b70 R08: ffff8800b410ec00 R09: ffff8800b410eb00
  [  208.339602] R10: 0000000000000001 R11: 0000000000000000 R12: ffff8800365ffb50
  [  208.339602] R13: ffff8800b611e2d0 R14: ffff88003616c000 R15: ffff8800b410ee00
  [  208.339602] FS:  0000000000000000(0000) GS:ffff8800bb200000(0000) knlGS:0000000000000000
  [  208.339602] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [  208.339602] CR2: 00007fda19930d50 CR3: 00000000b3f5e000 CR4: 00000000000006f0
  [  208.339602] Stack:
  [  208.339602]  ffff88003616c588 ffff8800b410eb00 ffff8800365ffce0 ffff8800b410ec00
  [  208.339602]  ffff8800b410ec00 ffff8800b358b800 ffff8800b611e2d0 ffff8800b410ec40
  [  208.339602]  ffff8800b611e090 ffff88003616c120 ffff8800b410eb00 ffff88003616c020
  [  208.339602] Call Trace:
  [  208.339602]  [<ffffffffa014b478>] relocate_tree_blocks+0x1d8/0x630 [btrfs]
  [  208.339602]  [<ffffffffa014c108>] ? add_data_references+0x248/0x280 [btrfs]
  [  208.339602]  [<ffffffffa014cd00>] relocate_block_group+0x280/0x690 [btrfs]
  [  208.339602]  [<ffffffffa014d2af>] btrfs_relocate_block_group+0x19f/0x2e0 [btrfs]
  [  208.339602]  [<ffffffffa012477f>] btrfs_relocate_chunk.isra.30+0x6f/0x730 [btrfs]
  [  208.339602]  [<ffffffffa00dab89>] ? btrfs_set_path_blocking+0x39/0x80 [btrfs]
  [  208.339602]  [<ffffffffa00df940>] ? btrfs_search_slot+0x380/0x940 [btrfs]
  [  208.339602]  [<ffffffffa011b289>] ? release_extent_buffer+0x69/0xd0 [btrfs]
  [  208.339602]  [<ffffffffa0120c8f>] ? free_extent_buffer+0x4f/0xa0 [btrfs]
  [  208.339602]  [<ffffffffa0128ecd>] __btrfs_balance+0x43d/0x800 [btrfs]
  [  208.339602]  [<ffffffffa012964b>] btrfs_balance+0x3bb/0x670 [btrfs]
  [  208.339602]  [<ffffffffa0129970>] balance_kthread+0x70/0x80 [btrfs]
  [  208.339602]  [<ffffffffa0129900>] ? btrfs_balance+0x670/0x670 [btrfs]
  [  208.339602]  [<ffffffff810847b0>] kthread+0xc0/0xd0
  [  208.339602]  [<ffffffff810846f0>] ? kthread_create_on_node+0x120/0x120
  [  208.339602]  [<ffffffff8170292c>] ret_from_fork+0x7c/0xb0
  [  208.339602]  [<ffffffff810846f0>] ? kthread_create_on_node+0x120/0x120
  [  208.339602] Code: f6 43 71 10 0f 85 18 0f 00 00 48 8d 43 40 48 89 c6 48 89 85 58 ff ff ff 48 8b 43 40 48 39 c6 74 0c 48 3b 43 48 0f 84 f5 08 00 00 <0f> 0b 48 c7 85 78 ff ff ff 00 00 00 00 0f 1f 40 00 e8 43 df 5a 
  [  208.339602] RIP  [<ffffffffa014a167>] build_backref_tree+0x277/0x11d0 [btrfs]
  [  208.339602]  RSP <ffff8800b3089a90>
  [  208.377485] ---[ end trace 7f1cd354cc35fbd9 ]---

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