Got this when running balance with 3.17.0-rc7:
(...)
[173394.571080] BTRFS info (device sdd1): relocating block group
4391666974720 flags 17
[173405.407779] BTRFS info (device sdd1): found 52296 extents
[173441.235837] BTRFS info (device sdd1): found 52296 extents
[173442.266918] BTRFS info (device sdd1): relocating block group
4390593232896 flags 17
[173451.515002] BTRFS info (device sdd1): found 22314 extents
[173473.761612] BTRFS info (device sdd1): found 22314 extents
[173474.498414] BTRFS info (device sdd1): relocating block group
4389519491072 flags 20
[173475.410657] ------------[ cut here ]------------
[173475.410717] kernel BUG at fs/btrfs/relocation.c:931!
[173475.410774] invalid opcode: 0000 [#1] SMP
[173475.410829] Modules linked in: ipt_MASQUERADE iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack
ip_tables x_tables cpufreq_ondemand cpufreq_conservative
cpufreq_powersave cpufreq_stats bridge stp llc ipv6 btrfs xor raid6_pq
zlib_deflate coretemp hwmon loop i2c_i801 i2c_core pcspkr battery
tpm_infineon tpm_tis tpm parport_pc parport video lpc_ich mfd_core
ehci_pci ehci_hcd button acpi_cpufreq ext4 crc16 jbd2 mbcache raid1 sg
sd_mod ahci libahci libata scsi_mod r8169 mii
[173475.411284] CPU: 1 PID: 5512 Comm: btrfs Not tainted 3.17.0-rc7 #1
[173475.411341] Hardware name: System manufacturer System Product
Name/P8H77-M PRO, BIOS 1101 02/04/2013
[173475.411450] task: ffff8807f1744830 ti: ffff88076e9b0000 task.ti:
ffff88076e9b0000
[173475.411555] RIP: 0010:[<ffffffffa02ef1ae>] [<ffffffffa02ef1ae>]
build_backref_tree+0x64a/0xe77 [btrfs]
[173475.411684] RSP: 0018:ffff88076e9b3888 EFLAGS: 00010287
[173475.411740] RAX: ffff8805abb30480 RBX: ffff880589dfcf00 RCX:
0000000000000003
[173475.411845] RDX: 00000510a31b8000 RSI: ffff880589dfcac0 RDI:
ffff8804c69f8800
[173475.411949] RBP: ffff88076e9b3988 R08: 00000000000143e0 R09:
0000000000000000
[173475.412053] R10: ffff8807c97366f0 R11: 0000000000000000 R12:
ffff8804c69f8800
[173475.412157] R13: ffff880589dfca80 R14: 0000000000000000 R15:
ffff88065a3b0000
[173475.412262] FS: 00007f320e446840(0000) GS:ffff88081fa40000(0000)
knlGS:0000000000000000
[173475.413687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[173475.413744] CR2: ffffffffff600400 CR3: 00000007ea08f000 CR4:
00000000001407e0
[173475.413849] Stack:
[173475.413899] ffff8807c820a000 0000000000000000 ffff880589dfcf00
ffff8801a22bf7c0
[173475.414007] ffff8801a22bfb60 ffff880589dfcac0 ffff88065a3b0124
0000000000000001
[173475.414114] ffff88065a3b0120 0000000000000003 ffff8805abb30480
ffff8805dbbb7240
[173475.414223] Call Trace:
[173475.414291] [<ffffffffa02f0480>] relocate_tree_blocks+0x1b7/0x532
[btrfs]
[173475.414364] [<ffffffffa02cac81>] ? free_extent_buffer+0x6f/0x7c
[btrfs]
[173475.414434] [<ffffffffa02ebcf3>] ? tree_insert+0x49/0x50 [btrfs]
[173475.414501] [<ffffffffa02eea1b>] ? add_tree_block+0x13a/0x162
[btrfs]
[173475.414570] [<ffffffffa02f1861>] relocate_block_group+0x275/0x4de
[btrfs]
[173475.414640] [<ffffffffa02f1c22>]
btrfs_relocate_block_group+0x158/0x278 [btrfs]
[173475.414763] [<ffffffffa02ce79c>]
btrfs_relocate_chunk.isra.62+0x58/0x5f7 [btrfs]
[173475.414884] [<ffffffffa02dd99f>] ?
btrfs_set_lock_blocking_rw+0x68/0x95 [btrfs]
[173475.414995] [<ffffffffa028eb04>] ?
btrfs_set_path_blocking+0x23/0x54 [btrfs]
[173475.415107] [<ffffffffa0293517>] ? btrfs_search_slot+0x7bc/0x816
[btrfs]
[173475.415177] [<ffffffffa02cac81>] ? free_extent_buffer+0x6f/0x7c
[btrfs]
[173475.415248] [<ffffffffa02d1679>] btrfs_balance+0xa7b/0xc80 [btrfs]
[173475.415318] [<ffffffffa02d7177>] btrfs_ioctl_balance+0x220/0x29f
[btrfs]
[173475.415388] [<ffffffffa02dc1e4>] btrfs_ioctl+0x10bd/0x2281 [btrfs]
[173475.415448] [<ffffffff810d5152>] ? handle_mm_fault+0x44d/0xa00
[173475.415507] [<ffffffff81173e76>] ? avc_has_perm+0x2e/0xf7
[173475.415566] [<ffffffff810d7c6d>] ? __vm_enough_memory+0x25/0x13c
[173475.415625] [<ffffffff8110d72d>] do_vfs_ioctl+0x3f2/0x43c
[173475.415682] [<ffffffff8110d7c5>] SyS_ioctl+0x4e/0x7d
[173475.415740] [<ffffffff81030a71>] ? do_page_fault+0xc/0xf
[173475.415798] [<ffffffff813b0652>] system_call_fastpath+0x16/0x1b
[173475.415856] Code: ff ff 01 e9 50 02 00 00 48 63 8d 48 ff ff ff 48 8b
85 50 ff ff ff 48 83 3c c8 00 75 46 48 8b 53 18 49 39 94 24 d8 00 00 00
74 02 <0f> 0b 4c 89 e7 e8 9b e8 ff ff 85 c0 74 21 48 8b 55 98 48 8d 43
[173475.416080] RIP [<ffffffffa02ef1ae>] build_backref_tree+0x64a/0xe77
[btrfs]
[173475.416151] RSP <ffff88076e9b3888>
[173475.416482] ---[ end trace 17e512e0d6dc91d7 ]---
--
Tomasz Chmielewski
http://www.sslrack.com
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