Scrub being stuck

Hello,

I've just completed a scrub on my home filesystem and now I wanted to start on my Archiv btrfs RAID 0.

root@horus ~ # uname -
a
Linux horus 3.15.2-1-ARCH #1 SMP PREEMPT Fri Jun 27 07:41:19 CEST 2014 x86_64 GNU/Linux

root@horus ~ # btrfs --version
Btrfs v3.14.2-dirty

root@horus ~ # btrfs fi show
Label: 'home' uuid: 571009c0-6cc4-4598-a77b-f175501d23fd
Total devices 1 FS bytes used 2.03TiB
devid 1 size 2.73TiB used 2.04TiB path /dev/sdb1

Label: 'Archiv' uuid: b2504193-efeb-4ef3-8797-a8d73536a416
Total devices 2 FS bytes used 5.14TiB
devid 1 size 2.73TiB used 2.73TiB path /dev/sdd1
devid 2 size 2.73TiB used 2.73TiB path /dev/sde1

Btrfs v3.14.2-dirty

root@horus ~ # btrfs fi df /mnt/Archiv
Data, RAID0: total=5.44TiB, used=5.13TiB
Data, single: total=8.00MiB, used=244.00KiB
System, RAID1: total=32.00MiB, used=396.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, RAID1: total=10.94GiB, used=8.71GiB
unknown, single: total=512.00MiB, used=0.00

root@horus ~ # btrfs scrub status /mnt/Archiv
scrub status for b2504193-efeb-4ef3-8797-a8d73536a416
scrub started at Thu Jan 2 21:13:35 2014, running for 1336 seconds total bytes scrubbed: 473.28GiB with 0 errors

root@horus ~ # btrfs scrub cancel /mnt/Archiv
ERROR: scrub cancel failed on /mnt/Archiv: not running

root@horus ~ # btrfs scrub resume
/mnt/Archiv
ERROR: scrub is already running.
To cancel use 'btrfs scrub cancel /mnt/Archiv'.
To see the status use 'btrfs scrub status [-d] /mnt/Archiv'.

root@horus ~ # btrfs scrub start
/mnt/Archiv
ERROR: scrub is already running.
To cancel use 'btrfs scrub cancel /mnt/Archiv'.
To see the status use 'btrfs scrub status [-d] /mnt/Archiv'.

A scrub I started at Jan 02 seems to be stuck somehow. The command outputs above were generated right now.

I'll be hapy to provide any more information.

Thx!

Florian

Amendment:

anything btrfs related dmesg shows is

[   38.240950] BTRFS info (device sdd1): csum failed ino 314 off 4129595392 
csum 1774389615 expected csum 2138618437
[   38.241365] BTRFS info (device sdd1): csum failed ino 314 off 4129595392 

csum 1774389615 expected csum 2138618437

This messages are the reason why I wanted to try a scrub.

http://marc.merlins.org/perso/btrfs/post_2014-04-26_Btrfs-Tips_-Cancel-A-
Btrfs-Scrub-That-Is-Already-Stopped.html

cheers
Holger

Scrub log record file seems corrupted sometimes, if you use latest btrfs-progs version. There should be an option '-f' for 'btrfs scrub start' which will allow scrub to skip check in userspace.

Actually, i am thinking whether it would be better to remove userspace check about scrub status since log record file is not so reliable.

Thanks,
Wang

Thanks! Changing to canceled:1 in /var/lib/btrfs/scrubXXXfooXXX did the trick. Last night the scrub finished successfully.