When creating a filesystem (single or redundant) with BTRFS and subsequently executing a balance [1], we see a kernel oops at the next mount [2]. Thanks, Daniel --- [1] # mkfs.btrfs /dev/sdb # mount /dev/sdb /store # btrfs filesystem balance /store # umount /store --- [2] # mount /dev/sdb /store Killed # dmesg device fsid bc4a5f28339d255f-6eccdd738ea4f0ac devid 1 transid 13 /dev/sdb btrfs: relocating block group 29360128 flags 36 btrfs: found 2 extents btrfs: relocating block group 20971520 flags 34 btrfs allocation failed flags 34, wanted 4096 space_info has 0 free, is not full space_info total=12582912, used=4096, pinned=0, reserved=0, may_use=0, readonly=12578816 block group 20971520 has 8388608 bytes, 4096 used 0 pinned 0 reserved entry offset 20975616, bytes 8384512, bitmap no block group has cluster?: no 1 blocks of free space at or bigger than bytes is block group 0 has 4194304 bytes, 0 used 0 pinned 0 reserved entry offset 131072, bytes 4063232, bitmap no block group has cluster?: no 1 blocks of free space at or bigger than bytes is btrfs: relocating block group 12582912 flags 1 btrfs: relocating block group 4194304 flags 4 device fsid bc4a5f28339d255f-6eccdd738ea4f0ac devid 1 transid 30 /dev/sdb BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0 IP: [<ffffffff81037cc9>] __ticket_spin_lock+0x9/0x20 PGD 305e2c067 PUD 305732067 PMD 0 Oops: 0002 [#1] SMP last sysfs file: /sys/devices/virtual/bdi/btrfs-4/uevent CPU 1 Modules linked in: lp i7core_edac ioatdma edac_core parport psmouse dca serio_raw joydev raid10 raid456 async_raid6_recov async_pq usbhid hid raid6_pq async_xor xor async_memcpy async_tx ahci libahci raid1 raid0 multipath e1000e linear btrfs zlib_deflate libcrc32c Pid: 1013, comm: mount Tainted: G W 2.6.38-020638rc6-generic #201102220910 Supermicro X8STi/X8STi RIP: 0010:[<ffffffff81037cc9>] [<ffffffff81037cc9>] __ticket_spin_lock+0x9/0x20 RSP: 0018:ffff880303be5a18 EFLAGS: 00010246 RAX: 0000000000000100 RBX: 00000000000000b0 RCX: ffff880305ed5750 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000000000b0 RBP: ffff880303be5a18 R08: ffff8803056e62e8 R09: ffff880303be58c0 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000004 R14: ffff8803056e4140 R15: ffff8803056e4000 FS: 00007f78247707e0(0000) GS:ffff8800df480000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000b0 CR3: 0000000303e85000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process mount (pid: 1013, threadinfo ffff880303be4000, task ffff880305710000) Stack: ffff880303be5a28 ffffffff815ace4e ffff880303be5a68 ffffffffa00231af ffff880304b56000 ffff8803056e4000 ffff8803056e6298 ffff880305ed5700 ffff8803056e4140 ffff8803056e4000 ffff880303be5aa8 ffffffffa00232b7 Call Trace: [<ffffffff815ace4e>] _raw_spin_lock+0xe/0x20 [<ffffffffa00231af>] calc_global_metadata_size+0x4f/0x120 [btrfs] [<ffffffffa00232b7>] update_global_block_rsv+0x37/0xe0 [btrfs] [<ffffffffa0023efb>] init_global_block_rsv+0xcb/0xe0 [btrfs] [<ffffffffa002a9df>] btrfs_read_block_groups+0x37f/0x4d0 [btrfs] [<ffffffff815ace4e>] ? _raw_spin_lock+0xe/0x20 [<ffffffffa003780d>] open_ctree+0x10cd/0x1480 [btrfs] [<ffffffff812d8716>] ? vsnprintf+0x186/0x530 [<ffffffff8116081c>] ? set_anon_super+0x7c/0x120 [<ffffffffa001624e>] btrfs_fill_super+0x7e/0x140 [btrfs] [<ffffffff81161cd8>] ? sget+0x238/0x260 [<ffffffff812d5b0f>] ? strlcpy+0x4f/0x70 [<ffffffffa001790b>] btrfs_mount+0x31b/0x3b0 [btrfs] [<ffffffff811611fa>] vfs_kern_mount+0x8a/0x200 [<ffffffff81161463>] do_kern_mount+0x53/0xb0 [<ffffffff8117da7a>] do_new_mount+0x7a/0xb0 [<ffffffff8117e148>] do_mount+0x188/0x1d0 [<ffffffff8117e21f>] sys_mount+0x8f/0xd0 [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b Code: ff 48 c7 c2 fe 7a 03 81 48 c7 c1 01 7b 03 81 e9 fe fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 b8 00 01 00 00 48 89 e5 <f0> 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6 c9 c3 66 0f 1f 44 RIP [<ffffffff81037cc9>] __ticket_spin_lock+0x9/0x20 RSP <ffff880303be5a18> CR2: 00000000000000b0 ---[ end trace a7919e7f17c0a728 ]--- -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
