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[  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 ]---

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


** Tags: btrfs kernel
-- 
Kernel stops during btrfs-balance
https://bugs.launchpad.net/bugs/1235798
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