Good day. I've got a failure with btrfs balance. In fact I started btrfs balance /btr and got a total filesystem freeze. After I tried applying balance pause or balance cancel the following crashdump appeared and btrfs tool freezed. Reboot changed nothing: I've got totally the same crashdump. So I mounted filesystem with skip_balance option and tried to cancel balance. It worked. Then I performed a btrfsck on my fs and it found nothing suspicious. So I believe it is just a balance bug. I suppose that could be because of lack of free space on device but should not filesystem reject balancing instead of crashing?
Best Regards, Slava Barinov. Crashdump: [ 114.475635] btrfs: enabling inode map caching [ 114.475640] btrfs: disk space caching is enabled [ 117.069811] BTRFS debug (device sdb2): unlinked 1 orphans [ 117.078876] btrfs: continuing balance [ 117.269167] mount (4055) used greatest stack depth: 3144 bytes left [ 133.779670] btrfs: relocating block group 447242829824 flags 1 [ 143.195258] btrfs: found 1532 extents [ 152.192595] ------------[ cut here ]------------ [ 152.195487] kernel BUG at fs/btrfs/relocation.c:1055! [ 152.198432] invalid opcode: 0000 [#1] SMP [ 152.201335] Modules linked in: nfsd vmnet(O) vmblock(O) vsock(O) vmci(O) vmmon(O) bridge stp ipv6 llc vboxnetflt(O) vboxnetadp(O) vboxdrv(O) pl2303 usbserial x86_pkg_temp_thermal coretemp kvm_intel kvm psmouse i2c_i801 [ 152.207676] CPU: 1 PID: 4078 Comm: btrfs-balance Tainted: G O 3.11.3-gentoo-ray #1 [ 152.210862] Hardware name: System manufacturer System Product Name/P8H77-V LE, BIOS 0608 07/27/2012 [ 152.214112] task: ffff8803b7417000 ti: ffff8803a0ae4000 task.ti: ffff8803a0ae4000 [ 152.217395] RIP: 0010:[<ffffffff8130e27c>] [<ffffffff8130e27c>] build_backref_tree+0x112c/0x11e0 [ 152.220751] RSP: 0018:ffff8803a0ae5ab8 EFLAGS: 00010246 [ 152.224119] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8803f1287910 [ 152.227481] RDX: ffff8803a0ae5b28 RSI: ffff8803b740e020 RDI: ffff8803f1287900 [ 152.230828] RBP: ffff8803a0ae5b98 R08: ffff88039ad40380 R09: ffff88040f403900 [ 152.234140] R10: ffffffff8130b5ee R11: 0000000000000000 R12: ffff8803f1287910 [ 152.237428] R13: ffff8803aa11b1b0 R14: ffff8803b740e000 R15: ffff88039ad40480 [ 152.240718] FS: 0000000000000000(0000) GS:ffff88041fa40000(0000) knlGS:0000000000000000 [ 152.244082] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 152.247434] CR2: 00007f5660bd5600 CR3: 0000000001c1a000 CR4: 00000000001407e0 [ 152.250787] Stack: [ 152.254068] ffff8803b740e580 ffff88039ad40580 ffff8803f1287960 ffff88039ad40380 [ 152.257432] ffff88039ad40380 ffff8803f13be000 ffff8803aa11b1b0 ffff88039ad403c0 [ 152.260753] ffff8803aa11b090 ffff8803b740e120 ffff88039ad40580 ffff8803b740e020 [ 152.264097] Call Trace: [ 152.267377] [<ffffffff8130e6e8>] relocate_tree_blocks+0x1d8/0x640 [ 152.270682] [<ffffffff8130f378>] ? add_data_references+0x238/0x270 [ 152.273970] [<ffffffff8130ff78>] relocate_block_group+0x278/0x680 [ 152.277268] [<ffffffff8131051f>] btrfs_relocate_block_group+0x19f/0x2e0 [ 152.280604] [<ffffffff812e8bfa>] btrfs_relocate_chunk.isra.32+0x6a/0x740 [ 152.283913] [<ffffffff812a0d81>] ? btrfs_set_path_blocking+0x31/0x70 [ 152.287194] [<ffffffff812a5b32>] ? btrfs_search_slot+0x372/0x930 [ 152.290448] [<ffffffff812e5217>] ? free_extent_buffer+0x47/0xa0 [ 152.293687] [<ffffffff812ed4f7>] btrfs_balance+0x8d7/0xe00 [ 152.296906] [<ffffffff812eda8b>] balance_kthread+0x6b/0x70 [ 152.300100] [<ffffffff812eda20>] ? btrfs_balance+0xe00/0xe00 [ 152.303275] [<ffffffff810646eb>] kthread+0xbb/0xc0 [ 152.306369] [<ffffffff81064630>] ? kthread_create_on_node+0x110/0x110 [ 152.309440] [<ffffffff8177683c>] ret_from_fork+0x7c/0xb0 [ 152.312481] [<ffffffff81064630>] ? kthread_create_on_node+0x110/0x110 [ 152.315517] Code: 4c 89 ef e8 87 2c f9 ff 48 8b bd 60 ff ff ff e8 7b 2c f9 ff 48 83 bd 38 ff ff ff 00 0f 85 e0 fc ff ff 31 c0 e9 ac ef ff ff 0f 0b <0f> 0b 48 8b 85 38 ff ff ff 49 8d 7e 20 48 8b 70 18 48 89 c2 e8 [ 152.322548] RIP [<ffffffff8130e27c>] build_backref_tree+0x112c/0x11e0 [ 152.325862] RSP <ffff8803a0ae5ab8> [ 152.329188] ---[ end trace f6907cd56547f763 ]--- [ 152.332881] btrfs-balance (4078) used greatest stack depth: 2976 bytes left # btrfs fi show /btr Btrfs v0.20-rc1-358-g194aa4a # btrfs fi df /btr Data: total=405.01GB, used=377.99GB System, DUP: total=8.00MB, used=52.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=12.50GB, used=8.55GB Metadata: total=8.00MB, used=0.00 # btrfs --version Btrfs v0.20-rc1-358-g194aa4a Kernel is just 3.11.3-gentoo. -ray is my machine config and several custom modules which are not loaded now. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
