[Libguestfs] [virt-builder] XFS metadata corruption in Fedora 23 template images (on resize)

[Richard W.M. Jones]

On Wed, Mar 16, 2016 at 09:06:50AM +0100, Kashyap Chamarthy wrote:
> Running this:
> 
>     $ virt-builder fedora-23 -o vm1.qcow2 --format qcow2 \
>         --root-password password:123456  --selinux-relabel --size 100G
> 
> And, importing vm1.qcow2 into libvirt results in these "corrupted
> metadata buffer" errors, in a continuous loop, on the serial console:

> [   51.717069] XFS (vda3): Metadata corruption detected at xfs_agf_read_verify+0x70/0x120 [xfs], block 0x29b

I can also reproduce this.

It's interesting that it happens on x86_64.  I have seem the same
problem, but it was on aarch64:

  https://bugzilla.redhat.com/show_bug.cgi?id=1315895

That bug is rather inconclusive.  Although I found a way to reproduce
the problem (involving creating disk images on aarch64 and copying
them over to x86_64), I don't know if the problem could be caused by
the way we run xfs_growfs or by XFS itself, nor if the problem is
pagesize / architecture specific or not.

Anyway, it needs deeper investigation.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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