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Re: [Xen-devel] [Xen-users] Data corruption with xl migrate

On Sun, Dec 17, 2017 at 3:53 PM, Andreas Pflug
<pgadmin@xxxxxxxxxxxxxxxxx> wrote:
> Still experiencing data corruption when migrating 3.16 VMs from one host
> to another...
> Seems independent of Xen version or storage backend.
> Regards
> Andreas
> Am 13.12.17 um 09:12 schrieb Andreas Pflug:
>> Recently, I encountered file system data corruption on several systems
>> after a migration (ext4, xfs, zfs). So far, I haven't been able to nail
>> down the cause for it.
>> All VMs affected run Debian Jessie with 3.16 kernel. Possibly newer 3.16
>> kernels are more likely to suffer corruption.
>> This happened on a Xen 4.1 cluster (yes, really old) using a SAN storage
>> system, but also on a Xen 4.8 cluster with DRBD mirroring. All systems
>> are working for >>1 year now, only recently those filesystem corruption
>> started to happen. Data blocks seem to get randomly garbled.
>> Migration of Debian Stretch or Windows VMs didn't show any anomalies so far.
>> Can anyone shed some light on this?

Thanks for the report -- cc'ing a few random people who know more
about the block layer / Debian kernels.

It seems Debian Jessie 3.16 kernel was experiencing corruption on
migration, but not the Debian Stretch kernel or Windows VMs.  That
sounds like a bug in the Debian kernel; any ideas about what patch may
be worth backporting / any steps to help further investigate the
source of the problems?


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