Re: [Xen-users] Filesystem corruptions

["Ph.T" <dr.addn@xxxxxxxxx>]

. one thing that impressed about Qubes OS

Âis that their whole project is about hardening Xen

and pointing out how to use it safely;

eg, don't share sd cards or usb drives with it

if you want to avoid firmware rootkits .

On Fri, Jun 20, 2014 at 8:44 AM, Patric Hafner | geOps <patric.hafner@xxxxxxxx> wrote:

Dear xen-users,

in the last two days, two different domUs on two different dom0s had suddenly corrupted filesystems which let to total data loss on both domUs. I have never suffered under this failure before and I guess it is related to XEN. Both domUs were running for long time without any problems and I am pretty sure, that the hard drives are fine (checked with smart checks).


[1215379.302679] EXT3-fs (xvda2): error in ext3_new_inode: IO failure
[1215379.302689] Aborting journal on device xvda2.
[1215379.304193] EXT3-fs (xvda2): error: ext3_journal_start_sb: Detected aborted journal
[1215379.304200] EXT3-fs (xvda2): error: remounting filesystem read-only
[1215379.329043] EXT3-fs (xvda2): error: remounting filesystem read-only
[1215379.329246] EXT3-fs (xvda2): error in ext3_create: IO failure
[1215379.330502] __journal_remove_journal_head: freeing b_committed_data

After shuting down of domUs, fsck failed to repair the filesystem and restore of files was necessary.
No updates of XEN or the kernel were made the days before.
It was no possible to reproduce the problem yet.


Setup for both physical hosts is exactly the same:

dom0
-----

Debian GNU/Linux 7.5 wheezy
sw-Raid via mdadm, LVM on top

ââ$ uname -a
Linux hostname 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3+deb7u2 x86_64 GNU/Linux


release        Â: 3.2.0-4-amd64
version        Â: #1 SMP Debian 3.2.54-2
machine        Â: x86_64
xen_major       Â: 4
xen_minor       Â: 1
xen_extra       Â: .4

Each running about 10 domains, and only one was affected each by this problem.

domU
--------

Debian GNU/Linux 7.5 wheezy
Boot via pygrub

Linux hostname 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3+deb7u2 x86_64 GNU/Linux


Has somebody an idea what is going wrong here?

Best regards,
Patric


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