Public bug reported:
Running a multi disk RAID 1 with btrfs for a while now on a Virtual Lab Server
with Ubuntu 14.04 amd64.
Today, after a clean reboot due to power failure initiated by the NUTS Daemon,
when the system came back online, the filesystem of this specific RAID 1
disappeared.
df -h shows very little disk space used in the RAID 1:
/dev/sdb 597G 80M 595G 1% /kvm
ls -las /kvm shows no files:
total 4
4 drwxr-xr-x 1 root root 0 Apr 21 11:26 .
0 drwxr-xr-x 1 root root 186 Apr 14 00:35 ..
btrfs filesystem show /kvm shows that apparently the previous information is
still in the hard drives:
Label: none uuid: 45075b5b-a389-445a-b70e-00a1bfcd313a
Total devices 2 FS bytes used 39.68MiB
devid 1 size 298.09GiB used 158.03GiB path /dev/sda
devid 2 size 298.09GiB used 158.03GiB path /dev/sdb
Btrfs v3.12
No subvolumes or snapshots exist, since no output is given from btrfs
subvolume list /kvm
Running a scrub on the RAID 1 completes successfully, with no errors found, but
only processes approximatle 80Mb of files:
scrub status for 45075b5b-a389-445a-b70e-00a1bfcd313a
scrub started at Mon Apr 21 15:37:55 2014 and finished after 1
seconds
total bytes scrubbed: 79.36MiB with 0 errors
Running a FS Check on both hard drives reveals no errors:
Checking filesystem on /dev/sda
UUID: 45075b5b-a389-445a-b70e-00a1bfcd313a
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 4382862 bytes used err is 0
total csum bytes: 0
total tree bytes: 188416
total fs tree bytes: 8192
total extent tree bytes: 36864
btree space waste bytes: 57988
file data blocks allocated: 41418752
referenced 41418752
Btrfs v3.12
Checking filesystem on /dev/sdb
UUID: 45075b5b-a389-445a-b70e-00a1bfcd313a
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 4382862 bytes used err is 0
total csum bytes: 0
total tree bytes: 188416
total fs tree bytes: 8192
total extent tree bytes: 36864
btree space waste bytes: 57988
file data blocks allocated: 41418752
referenced 41418752
Btrfs v3.12
Tried to perform a restore on one of the hard drives, but no information
was recovered.
Would really appreciate some feedback on this one, could be a really
serious btrfs bug.
Kind regards,
Márcio Santos
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: btrfs-tools 3.12-1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Mon Apr 21 15:29:28 2014
SourcePackage: btrfs-tools
UpgradeStatus: Upgraded to trusty on 2014-03-21 (30 days ago)
** Affects: btrfs-tools (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1310652
Title:
btrfs filesystem contents disappeared after reboot
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