Public bug reported:
I've had this bug for some time now. From ever since i started to use
KVM on 10.04 until now 11.10 and all versions in between. Also on
numerous hosts with different hardware. And with both linux and windows
guests.
VM's are working fine, but on reboot they hang. They have to be running for
some time though. VM's running for 10 days or more have a 90% possibility of it
happening. But it almost never happens on freshly booted VM's.
Also when a VM hangs in boot, 1 core on the host goes to 100% cpu and
virt-manager can not connect to the host anymore.
When already connected to the console of a linux guest with virt-manager (since
you can't connect anymore when it's hanging), you can see the kernel boot hang
right before virtio-pci would normally load virtio_net:
[ 0.865019] virtio-pci 0000:00:03.0: irq 42 for MSI/MSI-X
[ 0.865044] virtio-pci 0000:00:03.0: irq 43 for MSI/MSI-X
[ 0.865069] virtio-pci 0000:00:03.0: irq 44 for MSI/MSI-X
00:03.0 is indeed the virtio_net:
00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
Sometimes after a long wait time the VM does boot, although i can't
really confirm that now since it's been a while i actually waited and
not just kill it right away. But we're talking about hours. Fastest i've
ever seen it happen was more then 30 minutes. And i've seen cases where
a (non critical) windows server that got rebooted by windows update hung
for more then 1.5 day before i killed it.
Never ran into the problem when booting VM's that where powered off.
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/921609
Title:
virtio_net hangs guest on reboot
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