[Xen-bugs] [Bug 1332] New: Live migration fails when source machine has multiple domUs

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1332

           Summary: Live migration fails when source machine has multiple
                    domUs
           Product: Xen
           Version: 3.0.3
          Platform: x86-64
               URL: http://lists.xensource.com/archives/html/xen-users/2008-
                    08/msg00744.html
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: tom@xxxxxxxxxxxxxx


I have a three node RHEL cluster running some paravirtualised virtual machines,
each using a CLVM logical volume block device as their storage. There's no
cluster file systems involved and the block device for each virtual machine is
accessible on all three dom0 servers.

All dom0 and all domU are x86_64 RHEL 5.2 (also tried CentOS 5.2).

Live migration works perfectly when there's only one virtual machine involved.
However, if two virtual machines are running on one server and I try to migrate
one away to another server, xend starts to migrate the state (copies all the
memory, etc) and then I get this error on the domU console:

WARNING: g.e. still in use!
WARNING: leaking g.e. and page still in use!
WARNING: g.e. still in use!
WARNING: leaking g.e. and page still in use!
netif_release_rx_bufs: 0 xfer, 62 noxfer, 194 unused
WARNING: g.e. still in use!
WARNING: leaking g.e. and page still in use!


Below is the xend.log output from the source dom0 server. I've seen this before
on the xen-users list and it always relates to network-based shared storage,
whether that's iSCSI, DRBD or GNBD (my case). As far as I can tell, the
migration works fine and the VM's state transfers completely but then has a
problem trying to relinquish device 51712 (which is the xvda disk). The
'exception looking up device number for xvda' also has me suspicious that it's
a shared storage issue.


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