Migration of CentOS 6.5 VMs causes kernel panic after upgrading to oVirt 3.4.3

25 Jul 2014

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Hello=2C

I upgraded oVirt yesterday from 3.4.2 to 3.4.3 and performed a yum upgrade =
on all ovirt nodes as well without rebooting any of them.

After completing the upgrade=2C I tried to perform manual migration of VMs =
to a different host. The result was that all Windows 2003/2008  and CentOS =
5 VMs were migrated successfully without any issues but all CentOS 6.5 VMs =
crashed although migration was completed successfully.

By looking the console of the CentOS 6.5 VMs I noticed that a few seconds a=
fter migration was complete=2C all the processes were killed=2C many out of=
 memory errors were thrown as well as messages like "virtio_balloon virtio3=
: Out of puff! Cant' get 256 pages" and the VM ended up in kernel panic so =
I had to perform a manual poweroff and start the VM again.

Any ideas of what might be the cause? I have opened an urgent Bug for this =
(https://bugzilla.redhat.com/show_bug.cgi?id=3D1123274)

Thank you=2C

Sokratis

 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>Hello=2C<div><br></div><div><br>=
</div><div>I upgraded oVirt yesterday from 3.4.2 to 3.4.3 and performed a y=
um upgrade on all ovirt nodes as well without rebooting any of them.</div><=
div><br></div><div><br></div><div>After completing the upgrade=2C I tried t=
o perform manual migration of VMs to a different host. The result was that =
all Windows 2003/2008  =3Band CentOS 5 VMs were migrated successfully w=
ithout any issues but all CentOS 6.5 VMs crashed although migration was com=
pleted successfully.</div><div><br></div><div><br></div><div>By looking the=
 console of the CentOS 6.5 VMs I noticed that a few seconds after migration=
 was complete=2C all the processes were killed=2C many out of memory errors=
 were thrown as well as messages like "virtio_balloon virtio3: Out of puff!=
 Cant' get 256 pages" and the VM ended up in kernel panic so I had to perfo=
rm a manual poweroff and start the VM again.</div><div><br></div><div><br><=
/div><div>Any ideas of what might be the cause? I have opened an urgent Bug=
 for this (<a href=3D"https://bugzilla.redhat.com/show_bug.cgi?id=3D1123274=
" target=3D"_blank" style=3D"font-size: 12pt=3B">https://bugzilla.redhat.co=
m/show_bug.cgi?id=3D1123274</a>)</div><div><br></div><div><br></div><div>Th=
ank you=2C</div><div><br></div><div><br></div><div>Sokratis</div><div><br><=
/div><div><br></div><div><br></div><div><br></div><div><br></div> 		 	   		=
  </div></body>
</html>=

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