[Bugs] [Bug 1534403] New: Severe filesystem corruption with virtio and sharding. 100% reproducible

bugzilla at redhat.com bugzilla at redhat.com
Mon Jan 15 07:21:11 UTC 2018


https://bugzilla.redhat.com/show_bug.cgi?id=1534403

            Bug ID: 1534403
           Summary: Severe filesystem corruption with virtio and sharding.
                    100% reproducible
           Product: GlusterFS
           Version: 3.12
         Component: glusterd
          Assignee: bugs at gluster.org
          Reporter: luca at trendservizi.it
                CC: bugs at gluster.org



Hi,
I'm experiencing a severe and always reproducible filesystem corruption with
virtio drivers used inside a guest.
My setup is this:

3 nodes
1 volume in replica 3 arbiter 1 mode
"virt" group applied to volume
Gluster 3.12.4 from Centos repositories
KVM 2.9.0 compiled from RHEV sources
Guest machine using virtio drivers (Ubuntu 16.04.3 LTS server)

To reproduce the problem it's enough to:

1) Create a virtual machine with a virtual disk (better if QCOW2 format is
used, but the problem is there also in "raw" disk format) with virtio access
2) Try to install the Ubuntu 16.04.3 setup
3) After a while the setup fails with strange error; by inspecting the QCOW2
volume I found many files are full of null bytes
4) It seems that the problem appears after a bounce of write operations.

I've tested many times and the result is the same.

If, instead, I select a SCSI disk, everything works flawlessly.

Thank you for your help,

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