Got this while running balance. Some other operations were running in parallel (rsync etc.). [152727.584641] ------------[ cut here ]------------ [152727.584723] kernel BUG at fs/btrfs/relocation.c:1062! [152727.584802] invalid opcode: 0000 [#1] SMP [152727.584943] Modules linked in: veth 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 loop video i2c_i801 i2c_core button acpi_cpufreq pcspkr ehci_pci ehci_hcd lpc_ich mfd_core ext4 crc16 jbd2 mbcache raid1 sg sd_mod r8169 mii ahci libahci libata scsi_mod [152727.586767] CPU: 3 PID: 1540 Comm: btrfs Tainted: G W 3.13.0-rc4 #1 [152727.586888] Hardware name: System manufacturer System Product Name/P8H77-M PRO, BIOS 1101 02/04/2013 [152727.587011] task: ffff8805bedf9710 ti: ffff8805a9d9a000 task.ti: ffff8805a9d9a000 [152727.587132] RIP: 0010:[<ffffffffa02ab31f>] [<ffffffffa02ab31f>] build_backref_tree+0xb03/0xe7a [btrfs] [152727.587300] RSP: 0018:ffff8805a9d9b898 EFLAGS: 00010246 [152727.587379] RAX: ffff8805a9d9b900 RBX: ffff8805a9d9b920 RCX: ffff88055a72fa10 [152727.587499] RDX: ffff88055a72ff50 RSI: ffff88055a72ff80 RDI: ffff8807e8878600 [152727.587619] RBP: ffff8805a9d9b998 R08: ffff8807e8878b80 R09: 0000000000001000 [152727.587739] R10: 0000000000001000 R11: 0000160000000000 R12: 0000000000000000 [152727.587859] R13: ffff88055a72ff90 R14: ffff8805a9d9b930 R15: ffff88028e648000 [152727.587980] FS: 00007fca66eca840(0000) GS:ffff88081fac0000(0000) knlGS:0000000000000000 [152727.588101] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [152727.588180] CR2: 00007fac0ba80000 CR3: 00000007006d9000 CR4: 00000000001407e0 [152727.588300] Stack: [152727.588374] ffff8800611992c0 0000000000000000 ffff8806c99dd500 ffff8807e8878600 [152727.588623] ffff88055a72fde0 ffff8806c99dd240 ffff88028e648124 ffff88028e648124 [152727.588871] ffff88028e648120 ffff88028e648020 ffff8807ece02c60 ffff8807ece02a20 [152727.589120] Call Trace: [152727.589205] [<ffffffffa02ac13a>] relocate_tree_blocks+0x1c0/0x544 [btrfs] [152727.589292] [<ffffffffa024f2a9>] ? btrfs_release_path+0x6b/0x8a [btrfs] [152727.589382] [<ffffffffa02ad399>] relocate_block_group+0x23f/0x4c7 [btrfs] [152727.589470] [<ffffffffa02ad76f>] btrfs_relocate_block_group+0x14e/0x28d [btrfs] [152727.589598] [<ffffffffa028c8d2>] btrfs_relocate_chunk.isra.65+0x58/0x60e [btrfs] [152727.589727] [<ffffffffa029a1ff>] ? btrfs_set_lock_blocking_rw+0x89/0xb2 [btrfs] [152727.589853] [<ffffffffa024f1b7>] ? btrfs_set_path_blocking+0x23/0x54 [btrfs] [152727.589979] [<ffffffffa0253a1b>] ? btrfs_search_slot+0x72f/0x789 [btrfs] [152727.590068] [<ffffffffa0288be1>] ? free_extent_buffer+0x6f/0x7c [btrfs] [152727.590157] [<ffffffffa028f709>] btrfs_balance+0x9fe/0xbe0 [btrfs] [152727.590245] [<ffffffffa02954c9>] btrfs_ioctl_balance+0x220/0x29f [btrfs] [152727.590334] [<ffffffffa0298a66>] btrfs_ioctl+0xfce/0x2128 [btrfs] [152727.590417] [<ffffffff810c98c1>] ? handle_mm_fault+0x24f/0x965 [152727.590498] [<ffffffff810ccc11>] ? __vm_enough_memory+0x26/0x13d [152727.590581] [<ffffffff8110219e>] do_vfs_ioctl+0x3f7/0x441 [152727.590661] [<ffffffff8110223a>] SyS_ioctl+0x52/0x80 [152727.590741] [<ffffffff8138f222>] system_call_fastpath+0x16/0x1b [152727.590821] Code: 60 71 fd 49 89 40 50 49 89 40 58 49 8b 40 58 4d 89 68 58 49 83 c0 50 4d 89 45 00 49 89 45 08 4c 89 28 e9 aa 00 00 00 a8 10 75 02 <0f> 0b 83 e0 01 41 39 c4 74 02 0f 0b 45 85 e4 75 32 49 8b 70 18 [152727.593073] RIP [<ffffffffa02ab31f>] build_backref_tree+0xb03/0xe7a [btrfs] [152727.593194] RSP <ffff8805a9d9b898> [152727.593290] ---[ end trace b67170e8ece9f591 ]--- -- Tomasz Chmielewski http://wpkg.org -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html