to reply to my own thread: i managed to empty the filesystem, but it still segfaults in the same way when i try to balance the last few blocks. a `btrfs bal start -dusage=0 /mountpoint` finishes, but leaves a few blocks allocated. when i skip the usage=0, it segfaults.
What can i do to provide useful information? Remco On 03 Feb 2014, at 21:51, Remco Hosman - Yerf-it.com <re...@yerf-it.com> wrote: > FIrst, a bit of history of the filesystem: > used to be 6 disks, now 5. partially raid1 / raid10. been migrating back and > forth a few times. > As some point, a balance would not complete and would end with 164 > ENOSPC’ses, while there was plenty of unallocated space on each disk. > > i scanned for extends larger then 1gig and found a few, so ran a recursive > balance of the entire FS. > > I deceided to empty the filesystem and format it. > > i pulled most files off it some via btrfs send/receive, some via rsync. but 1 > subvol wouldn’t send. i don’t remember the exact error, but it was that a > extend could not be found on 1 of the disks. > > with only a few 100gig of data left, i decided to balance some remaining > empty space before doing a `btrfs dev del`, so have another disk to store > more data on. > but im hitting a snag, i hit a BUG_ON when doing a `btrfs bal start -dusage=2 > /mountpoint` : > > [ 3327.678329] btrfs: found 198 extents > [ 3328.117274] btrfs: relocating block group 84473084968960 flags 17 > [ 3329.278521] btrfs: found 103 extents > [ 3331.907931] btrfs: found 103 extents > [ 3332.386172] btrfs: relocating block group 84466642518016 flags 17 > [ 3333.536595] btrfs: found 86 extents > [ 3335.982967] btrfs: found 86 extents > [ 3336.599555] btrfs (4746) used greatest stack depth: 2744 bytes left > [ 3379.073464] btrfs: relocating block group 89878368419840 flags 17 > [ 3381.608948] btrfs: found 499 extents > [ 3383.884696] ------------[ cut here ]------------ > [ 3383.884720] kernel BUG at fs/btrfs/relocation.c:3405! > [ 3383.884731] invalid opcode: 0000 [#1] SMP > [ 3383.884742] Modules linked in: > [ 3383.884753] CPU: 0 PID: 5663 Comm: btrfs Not tainted 3.13.0 #1 > [ 3383.884763] Hardware name: System manufacturer System Product Name/E45M1-I > DELUXE, BIOS 0405 08/08/2012 > [ 3383.884778] task: ffff8802360eae80 ti: ffff88010dcaa000 task.ti: > ffff88010dcaa000 > [ 3383.884790] RIP: 0010:[<ffffffff812f0bd5>] [<ffffffff812f0bd5>] > __add_tree_block+0x1c5/0x1e0 > [ 3383.884811] RSP: 0018:ffff88010dcaba38 EFLAGS: 00010202 > [ 3383.884821] RAX: 0000000000000001 RBX: ffff880039f18000 RCX: > 00000000ffffffff > [ 3383.884832] RDX: 0000000000000000 RSI: 0000000000000000 RDI: > 0000000000000000 > [ 3383.884843] RBP: ffff88010dcaba90 R08: ffff88010dcab9f4 R09: > ffff88010dcab930 > [ 3383.884854] R10: 0000000000000000 R11: 000000000000047f R12: > 0000000000001000 > [ 3383.884865] R13: ffff88023489c630 R14: 0000000000000000 R15: > 0000528d112e4000 > [ 3383.884876] FS: 00007f8e27e74880(0000) GS:ffff88023ec00000(0000) > knlGS:0000000000000000 > [ 3383.884888] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 3383.884897] CR2: 00007f60d89f35a8 CR3: 00000001b5ada000 CR4: > 00000000000007f0 > [ 3383.884907] Stack: > [ 3383.884941] ffff88010dcabb28 4000ffff812bde34 00a80000528d112e > 0000000000000010 > [ 3383.885012] 0000000000001000 0000000000001000 0000000000000f3a > ffff8802348d6990 > [ 3383.885082] ffff88001cbf5a00 ffff880039f18000 00000000000000b8 > ffff88010dcabb00 > [ 3383.885153] Call Trace: > [ 3383.885192] [<ffffffff812f1a54>] add_data_references+0x244/0x2e0 > [ 3383.885232] [<ffffffff812f2a2b>] relocate_block_group+0x56b/0x640 > [ 3383.885272] [<ffffffff812f2ca2>] btrfs_relocate_block_group+0x1a2/0x2f0 > [ 3383.885313] [<ffffffff812cbcca>] btrfs_relocate_chunk.isra.27+0x6a/0x740 > [ 3383.885355] [<ffffffff81281a31>] ? btrfs_set_path_blocking+0x31/0x70 > [ 3383.885432] [<ffffffff81286816>] ? btrfs_search_slot+0x386/0x960 > [ 3383.885473] [<ffffffff812c6f07>] ? free_extent_buffer+0x47/0xa0 > [ 3383.885513] [<ffffffff812ceedb>] btrfs_balance+0x90b/0xea0 > [ 3383.885553] [<ffffffff812d5ec2>] btrfs_ioctl_balance+0x162/0x520 > [ 3383.885592] [<ffffffff812d9aed>] btrfs_ioctl+0xcbd/0x25c0 > [ 3383.885632] [<ffffffff818c094c>] ? __do_page_fault+0x1dc/0x520 > [ 3383.885673] [<ffffffff81136868>] do_vfs_ioctl+0x2c8/0x490 > [ 3383.885712] [<ffffffff81136ab1>] SyS_ioctl+0x81/0xa0 > [ 3383.885752] [<ffffffff818c4f5b>] tracesys+0xdd/0xe2 > [ 3383.885787] Code: ff 48 8b 4d a8 48 8d 75 b6 4c 89 ea 48 89 df e8 42 e7 ff > ff 4c 89 ef 89 45 a8 e8 c7 0f f9 ff 8b 45 a8 e9 69 ff ff ff 85 c0 74 d6 <0f> > 0b 66 0f 1f 84 00 00 00 00 00 b8 f4 ff ff ff e9 50 ff ff ff > [ 3383.886001] RIP [<ffffffff812f0bd5>] __add_tree_block+0x1c5/0x1e0 > [ 3383.886042] RSP <ffff88010dcaba38> > [ 3383.886359] ---[ end trace 075209044ce10da3 ]--- > Anything i can do to resolve / debug the issue? > > Remco-- > 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 -- 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
