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I had an issue with nova-compute hanging as well, with no helpful log messages even with debug enabled. It was a rabbitmq issue. Check rabbitmq logs for entries like this:

=INFO REPORT==== 12-Nov-2014::15:14:32 === Disk free space insufficient. Free bytes:696029184 Limit:1000000000

=WARNING REPORT==== 12-Nov-2014::15:14:32 === disk resource limit alarm set on node 'rabbit@xxxxxxx'.


* Publishers will be blocked until this alarm clears *