.. btrfs-vol -r missing /mnt/btrfs will end with segmentation fault due to this kernel BUG
(this box runs ubuntu server 10.02 Alpha 2 and the btrfs-tools package is from the ubuntu depository)
# btrfs-show
failed to read /dev/sdf
failed to read /dev/sr0
Label: btrfs_label_01 uuid: acc4b180-4a26-43cf-a103-1fc83faced1a
Total devices 6 FS bytes used 2.00GB
devid 1 size 931.51GB used 1.02GB path /dev/sda
devid 2 size 931.51GB used 1.00GB path /dev/sdb
devid 3 size 931.51GB used 2.00GB path /dev/sdc
devid 4 size 931.51GB used 2.00GB path /dev/sdd
devid 6 size 931.48GB used 1.01GB path /dev/sdg
*** Some devices missing
Btrfs Btrfs v0.19
# umount /mnt/btrfs
# btrfsctl -a
Scanning for Btrfs filesystems
failed to read /dev/sdg
failed to read /dev/sr0
# mount -o degraded /dev/sda /mnt/btrfs
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sde1 66G 3.8G 59G 7% /
/dev/sda 5.5T 28K 5.5T 1% /mnt/btrfs
# btrfs-vol -r missing /mnt/btrfs
removing missing devices from /mnt/btrfs
Segmentation fault
# dmsg
**
[ 482.623701] ------------[ cut here ]------------
[ 482.623703] kernel BUG at /build/buildd/linux-2.6.32/fs/btrfs/volumes.c:1772!
[ 482.623706] invalid opcode: 0000 [#1] SMP
[ 482.623709] last sysfs file:
/sys/devices/pci0000:00/0000:00:06.0/0000:02:05.0/host1/target1:0:0/1:0:0:0/block/sdb/uevent
[ 482.623712] CPU 0
[ 482.623714] Modules linked in: btrfs zlib_deflate crc32c libcrc32c
aoe binfmt_misc snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss
snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi
snd_seq_midi_event snd_seq snd_timer snd_seq_device snd ppdev parport_pc
soundcore snd_page_alloc amd64_edac_mod i2c_amd756 amd_rng psmouse
serio_raw i2c_amd8111 edac_core k8temp edac_mce_amd shpchp lp parport
fbcon tileblit font bitblit softcursor vga16fb vgastate r8169 ohci1394
mii aic7xxx ieee1394 e1000 scsi_transport_spi aacraid radeon ttm floppy
drm_kms_helper drm i2c_algo_bit
[ 482.623754] Pid: 3417, comm: btrfs-vol Not tainted 2.6.32-11-server
#15-Ubuntu To Be Filled By O.E.M.
[ 482.623757] RIP: 0010:[<ffffffffa03671d4>] [<ffffffffa03671d4>]
btrfs_relocate_chunk+0x2f4/0x320 [btrfs]
[ 482.623788] RSP: 0018:ffff8800baaf7c88 EFLAGS: 00010286
[ 482.623790] RAX: 00000000ffffffe4 RBX: ffff8800a7c77100 RCX:
ffff8800bc35d000
[ 482.623792] RDX: 0000000000000000 RSI: ffffea000292bc58 RDI:
0000000000000206
[ 482.623795] RBP: ffff8800baaf7d18 R08: 0000000000000036 R09:
000000000000c101
[ 482.623797] R10: 0000000000000005 R11: 0000000000000000 R12:
ffff8800bc3b4000
[ 482.623799] R13: 0000000000000020 R14: 0000000000000000 R15:
0000000000000003
[ 482.623802] FS: 00007f306b2ac740(0000) GS:ffff880001c00000(0000)
knlGS:0000000000000000
[ 482.623804] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 482.623806] CR2: 00007f306ac16ac0 CR3: 00000000aa012000 CR4:
00000000000006f0
[ 482.623808] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 482.623810] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 482.623813] Process btrfs-vol (pid: 3417, threadinfo
ffff8800baaf6000, task ffff8800a7c68000)
[ 482.623815] Stack:
[ 482.623816] 0000000000000da0 ffff8800aa275c00 ffff8800baaf7d18
ffffffffa03537a5
[ 482.623820] <0> ffff8800baaf7cd8 ffff8800ba7c80e8 0000000000000100
ffff8800ba7c80f0
[ 482.623823] <0> ffff8800a7d45000 ffff8800a3c3c108 ffff8800a7d43000
0000000041c00000
[ 482.623827] Call Trace:
[ 482.623839] [<ffffffffa03537a5>] ?
btrfs_dev_extent_chunk_offset+0xe5/0xf0 [btrfs]
[ 482.623848] [<ffffffffa0367701>] btrfs_shrink_device+0x221/0x390 [btrfs]
[ 482.623857] [<ffffffffa0367cd1>] btrfs_rm_device+0x1e1/0x480 [btrfs]
[ 482.623865] [<ffffffffa036dd97>] btrfs_ioctl+0x1c7/0x3f0 [btrfs]
[ 482.623871] [<ffffffff811508d2>] vfs_ioctl+0x22/0xa0
[ 482.623876] [<ffffffff812b1fba>] ? __up_read+0x9a/0xc0
[ 482.623879] [<ffffffff81150a71>] do_vfs_ioctl+0x81/0x410
[ 482.623884] [<ffffffff8108780e>] ? up_read+0xe/0x10
[ 482.623889] [<ffffffff815642cf>] ? do_page_fault+0x18f/0x360
[ 482.623891] [<ffffffff81150e81>] sys_ioctl+0x81/0xa0
[ 482.623897] [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
[ 482.623898] Code: 48 8b 7d c0 e8 be d2 ff ff 48 8b 75 c0 4c 89 e7 e8
42 ad fd ff 48 83 c4 68 31 c0 5b 41 5c 41 5d 41 5e 41 5f c9 c3 90 0f 0b
eb fe <0f> 0b eb fe 0f 0b eb fe 0f 0b eb fe 0f 0b eb fe 0f 0b eb fe 0f
[ 482.623924] RIP [<ffffffffa03671d4>]
btrfs_relocate_chunk+0x2f4/0x320 [btrfs]
[ 482.623933] RSP <ffff8800baaf7c88>
[ 482.623936] ---[ end trace 92bb2e88797fdf58 ]---
#
***
# lsscsi -g
[0:0:0:0] disk ATA ST31000520AS CC32 /dev/sda /dev/sg0
[1:0:0:0] disk ATA ST31000520AS CC32 /dev/sdb /dev/sg1
[2:0:0:0] disk ATA ST31000520AS CC32 /dev/sdc /dev/sg2
[3:0:0:0] disk ATA ST31000520AS CC32 /dev/sdd /dev/sg3
[4:0:0:0] cd/dvd SONY CD-RW CRX320E NYK5 /dev/sr0 /dev/sg4
[6:0:0:0] disk Adaptec system V1.0 /dev/sde /dev/sg5
[6:0:1:0] disk Adaptec disk2 V1.0 /dev/sdf /dev/sg6
[6:0:2:0] disk Adaptec disk3 V1.0 /dev/sdg /dev/sg7
[6:1:0:0] disk WDC WD740GD-00FLA2 31.0 - /dev/sg8
[6:1:1:0] disk WDC WD740GD-00FLA2 31.0 - /dev/sg9
[6:1:2:0] disk ST310005 20AS CC32 - /dev/sg10
[6:1:3:0] disk ST310005 20AS CC32 - /dev/sg11
**
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