Am Fri, 1 Apr 2016 01:27:21 +0200
schrieb Henk Slager <eye...@gmail.com>:

> It is not clear to me what 'Gentoo patch-set r1' is and does. So just
> boot a vanilla v4.5 kernel from kernel.org and see if you get csum
> errors in dmesg.

It is the gentoo patchset, I don't think anything there relates to
btrfs:
https://dev.gentoo.org/~mpagano/genpatches/trunk/4.5/

> Also, where does 'duplicate object' come from? dmesg ? then please
> post its surroundings, straight from dmesg.

It was in dmesg. I already posted it in the other thread and Qu took
note of it. Apparently, I didn't manage to capture anything else than:

btrfs_run_delayed_refs:2927: errno=-17 Object already exists

It hit me unexpected. This was the first time btrfs went RO for me. It
was with kernel 4.4.5 I think.

I suspect this is the outcome of unnoticed corruptions that sneaked in
earlier over some period of time. The system had no problems until this
incident, and only then I discovered the huge pile of corruptions when I
ran btrfsck.

I'm also pretty convinced now that VirtualBox itself is not the problem
but only victim of these corruptions, that's why it primarily shows up
in the VDI file.

However, I now found csum errors in unrelated files (see other post in
this thread), even for files not touched in a long time.

-- 
Regards,
Kai

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