Hello.
A circuit breaker failed a few times and now I can't mount my btrfs
volume - it fails with open_ctree failed:
[ 337.004372] [<ffffffff817865a5>] dump_stack+0x46/0x58
[ 337.004375] [<ffffffff810720ac>] warn_slowpath_common+0x8c/0xc0
[ 337.004378] [<ffffffff810720fa>] warn_slowpath_null+0x1a/0x20
[ 337.004387] [<ffffffffc04583b5>] btrfs_put_block_group+0x75/0x80
[btrfs]
[ 337.004398] [<ffffffffc046227d>] btrfs_free_block_groups+0xbd/0x2e0
[btrfs]
[ 337.004410] [<ffffffffc0470abd>] open_ctree+0x188d/0x1f70 [btrfs]
[ 337.004418] [<ffffffffc0442af1>] btrfs_fill_super.isra.84+0x81/0x130
[btrfs]
[ 337.004422] [<ffffffff8136d7f1>] ? disk_name+0x61/0xc0
[ 337.004425] [<ffffffff81392ab7>] ? strlcpy+0x47/0x60
[ 337.004434] [<ffffffffc04474be>] btrfs_mount+0x3ae/0x3d0 [btrfs]
[ 337.004439] [<ffffffff811e52e3>] mount_fs+0x43/0x1b0
[ 337.004443] [<ffffffff812004c6>] vfs_kern_mount+0x76/0x140
[ 337.004446] [<ffffffff81201c44>] do_new_mount+0xa4/0x1f0
[ 337.004448] [<ffffffff81202fe6>] do_mount+0x1e6/0x230
[ 337.004451] [<ffffffff812033b0>] SyS_mount+0x90/0xe0
[ 337.004454] [<ffffffff8179402d>] system_call_fastpath+0x1a/0x1f
mount -o recovery doesn't succeed, nor does mount -o recovery,ro.
I have tried the above with kernel 3.13.0 first and 3.16.0 later and the
behaviour seems identical. This may or may not be relevant, but after I
initialised the filesystem by copying some files to it (with kernel
3.13.0), one of the files failed a checksum error. I hadn't yet compared
the file that was written with the original to determine whether the
error was with the checksum or otherwise.
What are the next steps I should try? Should I try btrfs-zero-log? Or
should I try btrfsck? Or something else?
Regards,
Frankie Fisher
# uname -a
Linux mythtv 3.16.0-999-generic #201408010205 SMP Fri Aug 1 06:06:01 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux
# btrfs --version
Btrfs v3.12
# btrfs fi show
Label: none uuid: beaff1b6-fb0e-4b80-8b59-74968fd51066
Total devices 1 FS bytes used 342.01GiB
devid 1 size 1.36TiB used 349.04GiB path /dev/sdc2
Label: none uuid: 34d2986d-6954-4c5c-922c-799cc66cd28e
Total devices 1 FS bytes used 112.00KiB
devid 1 size 231.90GiB used 2.04GiB path /dev/sda2
Btrfs v3.12