[Bugs] [Bug 1511903] 3.8 -> 3.12 rolling upgrade fails

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1511903

Evgheni Dereveanchin <ederevea at redhat.com> changed:

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--- Comment #4 from Evgheni Dereveanchin <ederevea at redhat.com> ---
Sorry, I can't reproduce this on a clean environment and the one where we found
this bug was already rebuilt.

Basically the steps I did were:
1) set up a HyperConverged oVirt 4.1 environment with 3 NGN hosts, create some
VMs and let them run for a few weeks
2) upgrade one host to 4.2 beta

Not sure how we can proceed here without a stable reproducer, but just to
clarify - what needs to mismatch to get the "Version of Cksums data differ"?
What file is checksummed and how is this checksum computed? Here's the code
that seems to be responsible:

[1]
https://github.com/gluster/glusterfs/blob/master/xlators/mgmt/glusterd/src/glusterd-utils.c#L3386

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