#format wiki
#language en
= btrfs root filesystem corruption =
 * Linux hangs, i rebooted with with power button.
 * Only boots into rescue shell can't mount btrfs root  raid0 over two ssd's.
 * Log bug https://bugzilla.kernel.org/show_bug.cgi?id=196099
 * Boot with live Ubuntu 16.04 usb thumbdrive.
   *  $ sudo btrfs rescue chunk-recover -y -v /dev/sda2 > btrfs_rescue_chunk-recover-y-v.txt
   * capture btrfs rescue, with stdio+stderr to one file and stderr to 2nd file
     *  $ sudo btrfs rescue chunk-recover -y -v /dev/sda2      2>btrfs4.9.1_error.out.txt 1>btrfs4.9.1_stdio.out.txt 
   *  $ sudo dpkg -i btrfs-progs_4.9.1-1ubuntu1_amd64.deb btrfs-tools_4.9.1-1ubuntu1_amd64.deb 
   *  $ btrfs --version
           btrfs-progs v4.9.1
   * $ sudo btrfsck --repair -y -v /dev/sda2      2>btrfs4.9.1_repair.error.out.txt 1>btrfs4.9.1_repair.stdio.out.txt
      * Aborted (core dumped)



{{{
$ sudo btrfs check /dev/sda2
incorrect offsets 14881 539169
Checking filesystem on /dev/sda2
UUID: be6d3734-fb49-42d0-973c-547949d1b013
checking extents
incorrect offsets 14881 539169
bad block 558842675200
Errors found in extent allocation tree or chunk allocation
checking free space cache
checking fs roots
incorrect offsets 7795 532083
...
...
incorrect offsets 7795 532083
incorrect offsets 7795 532083
incorrect offsets 7795 532083
incorrect offsets 7795 532083
incorrect offsets 7795 532083
incorrect offsets 7795 532083
	unresolved ref dir 15472 index 0 namelen 104 name ECRYPTFS_FNEK_ENCRYPTED&FXZvkd1KmbFm2-TLjTCVJL3ZxYtD-zomwbXYUucAHBkMRRCJlE9vuOS36gm9wpi7LxUvI9UT8B7H6Js- filetype 1 errors 6, no dir index, no inode ref
	unresolved ref dir 15472 index 152801 namelen 104 name ECRYPTFS_FNEK_ENCRYPTED.FXZvkd1KmbFm2-TLjTCVJL3ZxYtD-zomwbXYUucAHBkMRRCJlE9vuOS36gm9wpi7LxUvI9UT8B7H6Js- filetype 1 errors 1, no dir item
root 258 inode 772374 errors 100, file extent discount
Found file extent holes:
	start: 0, len: 24576
found 105208057971 bytes used err is 1
total csum bytes: 0
total tree bytes: 46825472
total fs tree bytes: 0
total extent tree bytes: 46710784
btree space waste bytes: 16700977
file data blocks allocated: 59506688
 referenced 59506688
ubuntu@ubuntu:~$
}}}


{{{
$ sudo btrfs rescue chunk-recover -v /dev/sda2
All Devices:
	Device: id = 2, name = /dev/sdb2
	Device: id = 1, name = /dev/sda2

...
...
...
Unrecoverable Chunks:
  Chunk: start = 0, len = 4194304, type = 2, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 0
      No block group.
      No device extent.
  Chunk: start = 4194304, len = 8388608, type = 4, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 4194304
      No block group.
      No device extent.
  Chunk: start = 104173928448, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 104173928448
      No block group.
      No device extent.
  Chunk: start = 105247670272, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 103100186624
      No block group.
      No device extent.
  Chunk: start = 106321412096, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 100952702976
      No block group.
      No device extent.
  Chunk: start = 107395153920, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 99878961152
      No block group.
      No device extent.
  Chunk: start = 108468895744, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 97731477504
      No block group.
      No device extent.
  Chunk: start = 109542637568, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 95583993856
      No block group.
      No device extent.
  Chunk: start = 110616379392, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 93436510208
      No block group.
      No device extent.
  Chunk: start = 111690121216, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 91289026560
      No block group.
      No device extent.
  Chunk: start = 112763863040, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 89141542912
      No block group.
      No device extent.
  Chunk: start = 113837604864, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 88067801088
      No block group.
      No device extent.
  Chunk: start = 114911346688, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 86994059264
      No block group.
      No device extent.
  Chunk: start = 115985088512, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 83772833792
      No block group.
      No device extent.
  Chunk: start = 117058830336, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 82699091968
      No block group.
      No device extent.
  Chunk: start = 118132572160, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 81625350144
      No block group.
      No device extent.
  Chunk: start = 119206313984, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 80551608320
      No block group.
      No device extent.
  Chunk: start = 120280055808, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 79477866496
      No block group.
      No device extent.
  Chunk: start = 121353797632, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 78404124672
      No block group.
      No device extent.
  Chunk: start = 122427539456, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 77330382848
      No block group.
      No device extent.
  Chunk: start = 123501281280, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 75182899200
      No block group.
      No device extent.
  Chunk: start = 124575023104, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 74109157376
      No block group.
      No device extent.
  Chunk: start = 125648764928, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 73035415552
      No block group.
      No device extent.
  Chunk: start = 126722506752, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 70887931904
      No block group.
      No device extent.
  Chunk: start = 127796248576, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 69814190080
      No block group.
      No device extent.
  Chunk: start = 128869990400, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 68740448256
      No block group.
      No device extent.
  Chunk: start = 129943732224, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 67666706432
      No block group.
      No device extent.
  Chunk: start = 131017474048, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 65519222784
      No block group.
      No device extent.
  Chunk: start = 132091215872, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 64445480960
      No block group.
      No device extent.
  Chunk: start = 133164957696, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 62297997312
      No block group.
      No device extent.
  Chunk: start = 134238699520, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 61224255488
      No block group.
      No device extent.
  Chunk: start = 135312441344, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 59076771840
      No block group.
      No device extent.
  Chunk: start = 136386183168, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 58003030016
      No block group.
      No device extent.
  Chunk: start = 137459924992, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 56929288192
      No block group.
      No device extent.
  Chunk: start = 138533666816, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 54781804544
      No block group.
      No device extent.
  Chunk: start = 139607408640, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 53708062720
      No block group.
      No device extent.
  Chunk: start = 140681150464, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 52634320896
      No block group.
      No device extent.
  Chunk: start = 141754892288, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 51560579072
      No block group.
      No device extent.
  Chunk: start = 142828634112, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 49413095424
      No block group.
      No device extent.
  Chunk: start = 143902375936, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 48339353600
      No block group.
      No device extent.
  Chunk: start = 144976117760, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 47265611776
      No block group.
      No device extent.
  Chunk: start = 146049859584, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 46191869952
      No block group.
      No device extent.
  Chunk: start = 147123601408, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 45118128128
      No block group.
      No device extent.
  Chunk: start = 148197343232, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 44044386304
      No block group.
      No device extent.
  Chunk: start = 149271085056, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 42970644480
      No block group.
      No device extent.
  Chunk: start = 150344826880, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 41896902656
      No block group.
      No device extent.
  Chunk: start = 151418568704, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 40823160832
      No block group.
      No device extent.
  Chunk: start = 152492310528, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 39749419008
      No block group.
      No device extent.
  Chunk: start = 153566052352, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 38675677184
      No block group.
      No device extent.
  Chunk: start = 154639794176, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 37601935360
      No block group.
      No device extent.
  Chunk: start = 155713536000, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 36528193536
      No block group.
      No device extent.
  Chunk: start = 156787277824, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 35454451712
      No block group.
      No device extent.
  Chunk: start = 157861019648, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 34380709888
      No block group.
      No device extent.
  Chunk: start = 158934761472, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 33306968064
      No block group.
      No device extent.
  Chunk: start = 160008503296, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 32233226240
      No block group.
      No device extent.
  Chunk: start = 161082245120, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 31159484416
      No block group.
      No device extent.
  Chunk: start = 162155986944, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 30085742592
      No block group.
      No device extent.
  Chunk: start = 163229728768, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 29012000768
      No block group.
      No device extent.
  Chunk: start = 164303470592, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 27938258944
      No block group.
      No device extent.
  Chunk: start = 165377212416, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 26864517120
      No block group.
      No device extent.
  Chunk: start = 166450954240, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 25790775296
      No block group.
      No device extent.
  Chunk: start = 167524696064, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 24717033472
      No block group.
      No device extent.
  Chunk: start = 168598437888, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 23643291648
      No block group.
      No device extent.
  Chunk: start = 169672179712, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 22569549824
      No block group.
      No device extent.
  Chunk: start = 170745921536, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 21495808000
      No block group.
      No device extent.
  Chunk: start = 171819663360, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 20422066176
      No block group.
      No device extent.
  Chunk: start = 172893405184, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 19348324352
      No block group.
      No device extent.
  Chunk: start = 173967147008, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 18274582528
      No block group.
      No device extent.
  Chunk: start = 175040888832, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 17200840704
      No block group.
      No device extent.
  Chunk: start = 176114630656, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 15053357056
      No block group.
      No device extent.
  Chunk: start = 177188372480, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 13979615232
      No block group.
      No device extent.
  Chunk: start = 178262114304, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 12905873408
      No block group.
      No device extent.
  Chunk: start = 179335856128, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 10758389760
      No block group.
      No device extent.
  Chunk: start = 180409597952, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 8610906112
      No block group.
      No device extent.
  Chunk: start = 181483339776, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 7537164288
      No block group.
      No device extent.
  Chunk: start = 182557081600, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 5389680640
      No block group.
      No device extent.
  Chunk: start = 183630823424, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 4315938816
      No block group.
      No device extent.
  Chunk: start = 184704565248, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 3242196992
      No block group.
      No device extent.
  Chunk: start = 185778307072, len = 1073741824, type = 1, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 2168455168
      No block group.
      No device extent.
  Chunk: start = 186852048896, len = 1073741824, type = 4, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 6463422464
      No block group.
      No device extent.
  Chunk: start = 187925790720, len = 33554432, type = 2, num_stripes = 1
      Stripes list:
      [ 0] Stripe: devid = 1, offset = 12582912
      No block group.
      No device extent.

Total Chunks:		197
  Recoverable:		116
  Unrecoverable:	81

Orphan Block Groups:

Orphan Device Extents:

incorrect offsets 14881 539169
incorrect offsets 14881 539169
Search block group failed(-1)
...

}}}

{{{
$ sudo btrfsck --repair /dev/sda2
enabling repair mode
incorrect offsets 14881 539169
repair mode will force to clear out log tree, Are you sure? [y/N]: y
Unable to find block group for 0
extent-tree.c:289: find_search_start: Assertion `1` failed.
btrfs check[0x438110]
btrfs check(btrfs_reserve_extent+0x70b)[0x43c31e]
btrfs check(btrfs_alloc_free_block+0x63)[0x43c5ae]
btrfs check(__btrfs_cow_block+0x100)[0x430792]
btrfs check(btrfs_cow_block+0x93)[0x430d3b]
btrfs check[0x434cc4]
btrfs check(btrfs_commit_transaction+0xb5)[0x436519]
btrfs check(cmd_check+0x424)[0x424963]
btrfs check(main+0x139)[0x40ec30]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f828446b830]
btrfs check(_start+0x29)[0x40ec69]
ubuntu@ubuntu:~$ 

}}}

...