virbr0 not created at startup

[Serge Hallyn]

This could be the cause of bug 918807 - or it could be unrelated.

Normally virbr0 is created on my laptop at boot. This morning it wasn't, and /var/log/libvirt/libvirtd.log showed:

2012-01-27 08:06:52.402+0000: 1788: info : libvirt version: 0.9.8
2012-01-27 08:06:52.402+0000: 1788: error : virCommandWait:2192 : internal error Child process (/sbin/iptables --table nat --insert POSTROUTING --source 192.168.122.0/24 ! --destination 192.168.122.0/24 --jump MASQUERADE) status unexpected: exit status 4
2012-01-27 08:06:52.498+0000: 1788: error : networkAddMasqueradingIptablesRules:961 : failed to add iptables rule to enable masquerading

[Serge Hallyn (serge-hallyn)]

Assuming -4 is meant to be -EINTR, should iptables have tried to restart? Should libvirt retry on -EINTR?

[Serge Hallyn (serge-hallyn)]

Haven't seen this again. marking invalid.

[Serge Hallyn (serge-hallyn)]

This bug has been sighted by lynxman, so I'm marking it confirmed.

He kindly gave me access to the VM to try to debug. The version of libvirt he had installed was 0.9.8-2ubuntu13.

When I tried to add some debugging and rebuilt, the symptom went away.

When I took the 0.9.8-2ubuntu13 sources and simply rebuilt those with no changes, the symptom went away!

Each time, if i re-installed the packages from /var/cache/apt/archives, the symptom would come back.

When I installed the .ddebs from the archive, the symptom went away.

I confirmed the sha1sums for the versions in /var/cache/apt/archives were correct.

[Serge Hallyn (serge-hallyn)]

Brought the issue up at the mailing list here: https://www.redhat.com/archives/libvir-list/2012-March/msg00733.html