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Scrub bug on kernel 2.13

DISCUSSION Swâmi Petaramesh 2 participants 4 messages Apr 7, 2014 Btrfs file system

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Swâmi Petaramesh

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#0 lore raw

Hi there,

Machine got rebooted while scrub was in process, and now it looks like a scrub zombie...

How do I restore this to a normal non-zombie state ?

root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
        scrub started at Mon Apr  7 09:49:48 2014, running for 693 seconds
        total bytes scrubbed: 34.06GiB with 0 errors
root@zafu:~# btrfs scrub cancel /
ERROR: scrub cancel failed on /: not running
root@zafu:~# btrfs scrub start /
ERROR: scrub is already running.
To cancel use 'btrfs scrub cancel /'.
To see the status use 'btrfs scrub status [-d] /'.
root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
        scrub started at Mon Apr  7 09:49:48 2014, running for 693 seconds
        total bytes scrubbed: 34.06GiB with 0 errors
Signature · 1 line
Swâmi Petaramesh <[email protected]> http://petaramesh.org PGP 9076E32E
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#1 lore raw

Sorry, I meant kernel 3.13 :-)

Linux zafu 3.13.8-1-ARCH #1 SMP PREEMPT Tue Apr 1 12:19:51 CEST 2014 x86_64 GNU/Linux

Quoted 24 lines · Le lundi 7 avril 2014 10:32:04 Swâmi Petaramesh a écrit :

Hi there,

Machine got rebooted while scrub was in process, and now it looks like a scrub zombie...

How do I restore this to a normal non-zombie state ?

root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
        scrub started at Mon Apr  7 09:49:48 2014, running for 693 seconds
        total bytes scrubbed: 34.06GiB with 0 errors
root@zafu:~# btrfs scrub cancel /
ERROR: scrub cancel failed on /: not running
root@zafu:~# btrfs scrub start /
ERROR: scrub is already running.
To cancel use 'btrfs scrub cancel /'.
To see the status use 'btrfs scrub status [-d] /'.
root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
        scrub started at Mon Apr  7 09:49:48 2014, running for 693 seconds
        total bytes scrubbed: 34.06GiB with 0 errors
Signature · 10 lines
Swâmi Petaramesh <[email protected]> http://petaramesh.org PGP 9076E32E
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#2 lore raw
In reply to Swâmi Petaramesh
Quoted 6 lines · Swâmi Petaramesh

Hi there,

Machine got rebooted while scrub was in process, and now it looks like a scrub zombie...

How do I restore this to a normal non-zombie state ?

There's a status file in /var/lib/btrfs (at least, it's somewhere
near there -- I think that's it, though). Delete that, and you should be OK. It's a known bug, and I'm fairly sure it was fixed in the userspace tools some time ago. What version of the tools are you using?

Hugo.

Quoted 18 lines
root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
        scrub started at Mon Apr  7 09:49:48 2014, running for 693 seconds
        total bytes scrubbed: 34.06GiB with 0 errors
root@zafu:~# btrfs scrub cancel /
ERROR: scrub cancel failed on /: not running
root@zafu:~# btrfs scrub start /
ERROR: scrub is already running.
To cancel use 'btrfs scrub cancel /'.
To see the status use 'btrfs scrub status [-d] /'.
root@zafu:~# btrfs scrub status /
scrub status for 13c87f57-3a85-4daf-a4bf-ba777407c169
        scrub started at Mon Apr  7 09:49:48 2014, running for 693 seconds
        total bytes scrubbed: 34.06GiB with 0 errors
Signature · 3 lines
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
    --- Questions are a burden, and answers a prison for oneself. ---
author
#3 lore raw

Re: Scrub bug on kernel 3.13

Quoted 2 lines · Le lundi 7 avril 2014 10:02:36 Hugo Mills a écrit :

There's a status file in /var/lib/btrfs (at least, it's somewhere
near there -- I think that's it, though). Delete that

# rm /var/lib/btrfs/scrub.status.13c87f57-3a85-4daf-a4bf-ba777407c169
Quoted 1 line

and you should be OK.

I'm OK, thanks ! :-)

Quoted 1 line

What version of the tools are you using?

Latest Arch available version:

# pacman -Qi btrfs-progs
Name           : btrfs-progs
Version        : 3.12-1
Description    : btrfs filesystem utilities
Architecture   : x86_64
URL            : http://btrfs.wiki.kernel.org/
[...]
Provides       : btrfs-progs-unstable
[...]
Conflicts With : btrfs-progs-unstable
Replaces       : btrfs-progs-unstable
Installed Size : 2480,00 KiB
Packager       : Tom Gundersen <[email protected]>
Build Date     : mer. 27 nov. 2013 12:24:33 CET
Install Date   : dim. 22 déc. 2013 09:48:58 CET
Install Reason : Explicitly installed
Install Script : Yes
Validated By   : Signature

Thanks again :-)

Signature · 1 line
Swâmi Petaramesh <[email protected]> http://petaramesh.org PGP 9076E32E