[Xen-users] Failing to provision a VM when vif MTU > 1500 with patches applied

[Digimer <linux@xxxxxxxxxxx>]

Hi all,

  I'm testing the patches from rhbz 697021 and 697310. I've run into an
odd problem, which I expect is just the matter of an exit code with
either xen-network-common.sh (patched) or vif-bridge.

Bug links:
- https://bugzilla.redhat.com/show_bug.cgi?id=697021
- https://bugzilla.redhat.com/show_bug.cgi?id=697310

  When I try to provision a new VM, the VM starts paused. If I wait long
enough, it fails (see below). If I drop the call to the background with
<ctrl>+<z> and then unpause the VM, it will be 50/50 chance whether it
stays up and running or is destroyed when the caller script gives up on
vif.

  Regardless, I see that the vifX.Y interface was, in fact, created and
is up. When I unpause the VM, data passes over the vif, so I know it's
working, too.

  Here is what I get from the terminal where I provision the VM:

====
virt-install --connect xen \
> --name vm0002_pppoe \
> --ram 2048 \
> --arch x86_64 \
> --vcpus 1 \
> --cpuset 1-7 \
> --location http://10.255.0.1/f9/x86_64/img \
> --os-type linux \
> --os-variant rhel5.4 \
> --disk path=/dev/drbd_x4_vg0/vm0002_1 \
> --network bridge=xenbr0 \
> --network bridge=xenbr2 \
> --vnc \
> --paravirt


Starting install...
Retrieving file .treeinfo...                             |  390 B
00:00
Retrieving file vmlinuz...                               | 1.8 MB
00:00
Retrieving file initrd.img...                            |  16 MB
00:01
ERROR    POST operation failed: xend_post: error from xen daemon:
(xend.err 'Device 1 (vif) could not be connected. Hotplug scripts not
working.')
Domain installation may not have been
 successful.  If it was, you can restart your domain
 by running 'virsh start vm0002_pppoe'; otherwise, please
 restart your installation.
ERROR    POST operation failed: xend_post: error from xen daemon:
(xend.err 'Device 1 (vif) could not be connected. Hotplug scripts not
working.')
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 892, in ?
    main()
  File "/usr/sbin/virt-install", line 754, in main
    start_time, guest.start_install)
  File "/usr/sbin/virt-install", line 816, in do_install
    dom = install_func(conscb, progresscb, wait=(not wait))
  File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541,
in start_install
    return self._do_install(consolecb, meter, removeOld, wait)
  File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633,
in _do_install
    self.domain = self.conn.createLinux(install_xml, 0)
  File "/usr/lib64/python2.4/site-packages/libvirt.py", line 1277, in
createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed',
conn=self)
libvirtError: POST operation failed: xend_post: error from xen daemon:
(xend.err 'Device 1 (vif) could not be connected. Hotplug scripts not
working.')
====

  And here is what I see in /var/log/messages.

====
Apr 28 18:06:00 xenmaster004 kernel: device vif2.0 entered promiscuous mode
Apr 28 18:06:00 xenmaster004 kernel: ADDRCONF(NETDEV_UP): vif2.0: link
is not ready
Apr 28 18:07:40 xenmaster004 kernel: xenbr0: port 3(vif2.0) entering
disabled state
Apr 28 18:07:40 xenmaster004 kernel: device vif2.0 left promiscuous mode
Apr 28 18:07:40 xenmaster004 kernel: xenbr0: port 3(vif2.0) entering
disabled state
====

  Any clues?

-- 
Digimer
E-Mail: digimer@xxxxxxxxxxx
AN!Whitepapers: http://alteeve.com
Node Assassin:  http://nodeassassin.org

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