Hello, i tried to convert a JBOD BTRFS consisting of 5 disks (6TB each) to raid10 (converting from an earlier configuration). All disk were backed by bcache.
Because a rebalance takes very long I had to pause the balance for a required reboot. After the reboot, the mount is getting stuck and the system crashes eventually. OS: Fedora 25 kernel 4.11.3-200 DMESG: [120095.898769] CPU: 2 PID: 2110 Comm: mount Tainted: G D L 4.11.3-200.fc25.x86_64 #1 [120095.898789] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z77X-UD5H, BIOS F15q 01/07/2013 [120095.898812] task: ffff892f10684b00 task.stack: ffffa9a18e21c000 [120095.898829] RIP: 0010:queued_spin_lock_slowpath+0x179/0x1a0 [120095.898843] RSP: 0018:ffffa9a18e21f2c8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 [120095.898861] RAX: 0000000000000101 RBX: ffff892e72d1ae00 RCX: 0000000000000001 [120095.898878] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffff892f0dde4c00 [120095.898896] RBP: ffffa9a18e21f2c8 R08: 0000000000000101 R09: 0000000180380033 [120095.898913] R10: 0000168d1347c000 R11: 0000000000000000 R12: ffff892f0dde4c00 [120095.898931] R13: ffff892e72d1ae00 R14: ffff892f29764b58 R15: ffff892f0dde4c00 [120095.898948] FS: 00007f3e8f844340(0000) GS:ffff892f5f300000(0000) knlGS:0000000000000000 [120095.898968] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [120095.898983] CR2: 00007f53ff435638 CR3: 00000007d1401000 CR4: 00000000001406e0 [120095.899000] Call Trace: [120095.899009] _raw_spin_lock+0x20/0x30 [120095.899035] find_free_extent+0x9ad/0x1030 [btrfs] [120095.899055] btrfs_reserve_extent+0x92/0x1f0 [btrfs] [120095.899075] btrfs_alloc_tree_block+0xfe/0x4b0 [btrfs] [120095.899095] __btrfs_cow_block+0x13d/0x5d0 [btrfs] [120095.899114] btrfs_cow_block+0xff/0x1a0 [btrfs] [120095.899132] btrfs_search_slot+0x1f4/0x9d0 [btrfs] [120095.899153] btrfs_search_prev_slot.constprop.10+0x18/0x40 [btrfs] [120095.899177] modify_free_space_bitmap+0x84/0x3d0 [btrfs] [120095.899198] __remove_from_free_space_tree+0xfd/0x2b0 [btrfs] [120095.899214] ? kmem_cache_alloc+0xe3/0x1b0 [120095.899231] ? btrfs_alloc_path+0x1a/0x20 [btrfs] [120095.899251] remove_from_free_space_tree+0x85/0x150 [btrfs] [120095.899272] __btrfs_run_delayed_refs+0xff2/0x12b0 [btrfs] [120095.899293] btrfs_run_delayed_refs+0x8f/0x2a0 [btrfs] [120095.899314] commit_cowonly_roots+0xa5/0x310 [btrfs] [120095.899336] ? btrfs_qgroup_account_extents+0x84/0x1a0 [btrfs] [120095.899358] btrfs_commit_transaction+0x45a/0x930 [btrfs] [120095.899372] ? kmem_cache_alloc_trace+0xea/0x1b0 [120095.899392] ? tree_insert+0x4d/0x60 [btrfs] [120095.899412] btrfs_recover_relocation+0x2af/0x450 [btrfs] [120095.899434] open_ctree+0x1f81/0x2410 [btrfs] [120095.899452] btrfs_mount+0xd94/0xec0 [btrfs] [120095.899464] ? find_next_bit+0xb/0x10 [120095.899475] ? find_next_bit+0xb/0x10 [120095.899486] mount_fs+0x38/0x150 [120095.899496] ? __alloc_percpu+0x15/0x20 [120095.899508] vfs_kern_mount+0x67/0x130 [120095.899524] btrfs_mount+0x1b8/0xec0 [btrfs] [120095.899536] ? find_next_bit+0xb/0x10 [120095.899547] mount_fs+0x38/0x150 [120095.899556] ? __alloc_percpu+0x15/0x20 [120095.899568] vfs_kern_mount+0x67/0x130 [120095.900442] do_mount+0x1dd/0xc50 [120095.901312] ? _copy_from_user+0x4e/0x80 [120095.902181] ? kmem_cache_alloc_trace+0xea/0x1b0 [120095.903048] ? copy_mount_options+0x2c/0x220 [120095.903903] SyS_mount+0x83/0xd0 [120095.904744] entry_SYSCALL_64_fastpath+0x1a/0xa9 [120095.905574] RIP: 0033:0x7f3e8e8b16fa [120095.906381] RSP: 002b:00007ffe76a00768 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [120095.907185] RAX: ffffffffffffffda RBX: 00007f3e8f41f907 RCX: 00007f3e8e8b16fa [120095.907972] RDX: 000055c13c9e0270 RSI: 000055c13c9e2f40 RDI: 000055c13c9e0210 [120095.908743] RBP: 000055c13c9e00f0 R08: 000055c13c9e0230 R09: 0000000000000014 [120095.909496] R10: 00000000c0ed0000 R11: 0000000000000246 R12: 00007f3e8f62e184 [120095.910231] R13: 00007ffe76a00a78 R14: 0000000000000000 R15: 00000000ffffffff [120095.910949] Code: 41 39 c0 74 e6 4d 85 c9 c6 07 01 74 30 41 c7 41 08 01 00 00 00 e9 52 ff ff ff 83 fa 01 0f 84 b0 fe ff ff 8b 07 84 c0 74 08 f3 90 <8b> 07 84 c0 75 f8 b8 01 00 00 00 66 89 07 5d c3 f3 90 4c 8b 09 I tried older kernels, and an alternate linux installation (arch stable(4.11-something) and 4.12-rc4 from AUR) I also removed the caching devices from the single bcache disks. Options tested: skip_balance Nothing helped so far. Any hints, Thanks in advance, Thomas -- 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
