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0e1f616
(Get the code!)
I am having the same issue, and gave an in-depth inspection in my report: bug 1016848
I am running version Essex 2012.1, and networking in VlanManager mode, a dedicated nova-network gateway, KVM and virt-type, Ubuntu 12.04 Precise, and run into this incident in up to every 1-2 days, yesterday even twice within 3 hours.
One symptom may be high networking traffic I/O on the given KVM instance.
Until now, I worked around by `nova reboot $instance_name`.
bradleyd (bradleydsmith), what exactly did you mean by ifdown & ifup? the vnet%d interface or the bridge (e.g. br100) ? What interface did you re-up? -- for the mean time, I'd like to write a tiny daemon that runs on the hypervisor nodes, to check every N secs whether or not it can PING the KVM, and if not, it is to re-up its underlying network interface.
Serge Hallyn, I'd like to assist in whatever you need to get this beast fixed, since for me this is also a very major incident, too, and I just can't add more production services until knowing the OpenStack-stack is functioning well. So please tell me what I can provide you with. :-)
Regards,
Christian.