Re: WARNING at fs/btrfs/super.c:260 __btrfs_abort_transaction (error -17)

[Chris Mason <clm@fb.com>]

On Tue, Mar 24, 2015 at 9:43 AM, Sophie Dexter 
<Just4pLeisure@gmail.com> wrote:
> On 20/03/2015 15:19, Sophie Dexter wrote:
>> I'm given to understand that this is the right place to report a 
>> btrfs
>> problem, I apologise if not :-(
>> 
>> I have been using my router as a simple NFS NAS for around 2 years
>> with an ext3 formatted 2 TB Western Digital 2.5" USB Passport disk. I
>> have been slowly moving to BTRFS and thought it about time to convert
>> this disk too but unfortunately BTRFS is unreliable on my router :-(.
>> It doesn't take long for an error to happen causing a 'ro' remount.
>> However the disk is unreadable after the remount, both for NFS and
>> locally. Rebooting the router seems to be the only way to access the
>> disk again.
>> 
>> I also have a 1 GB swap partition on the disk although swap doesn't
>> appear to be a factor as the problem occurs whether or not swap is
>> enabled (this report is without swap).
>> 
>> I used my laptop to convert the fs to btrfs, not my router. My laptop
>> has Fedora 21 with 3.18 kernel and tools. No problems are found when 
>> I
>> use my laptop to check and scrub the disk (i.e. with the disk
>> connected directly to my laptop).

You have great timing, there are two reports of a very similar abort 
with 4.0-rc5, but your report makes it clear these are not a regression 
from 4.0-rc4.

Are you able to run btrfsck on this filesystem?  I'd like to check for 
metadata inconsistencies.

-chris