Scrub bug on kernel 2.13

Scrub bug on kernel 2.13

[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 ?

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

-- 
Swâmi Petaramesh <swami@petaramesh.org> http://petaramesh.org PGP 9076E32E

Re: Scrub bug on kernel 2.13

[Swâmi Petaramesh]

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


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

-- 
Swâmi Petaramesh <swami@petaramesh.org> http://petaramesh.org PGP 9076E32E
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Re: Scrub bug on kernel 2.13

[Hugo Mills]

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On Mon, Apr 07, 2014 at 10:32:04AM +0200, Swâmi Petaramesh wrote:
> 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.

> 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
> 

-- 
=== 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. ---    

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Re: Scrub bug on kernel 3.13

[Swâmi Petaramesh]

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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

> and you should be OK.

I'm OK, thanks ! :-)

> 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 <teg@jklm.no>
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 :-)

-- 
Swâmi Petaramesh <swami@petaramesh.org> http://petaramesh.org PGP 9076E32E

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