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nova-compute agent hangs in futex call

Hello, I'm running Liberty release on Ubuntu 14.04 and I had to recreate the nova database. After I recreated it , using nova-manage sync db , All the nova-compute agents are stuck in this syscall:

futex(0x2dd2914, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 25586585, {1449677025, 974868766}, ffffffff) = -1 ETIMEDOUT (Connection timed out)

All the other nova services running on the controllers are working fine. Has someone else had such an issue ? The debug messages in /var/log/nova/nova-compute.log look like these:

2015-12-09 10:52:32.240 13748 ERROR nova.compute.manager [req-39f672ac-46cb-4ca5-a81e-01ef90fd06ed - - - - -] No compute node record for host xxxx 2015-12-09 10:52:32.243 13748 WARNING nova.compute.monitors [req-39f672ac-46cb-4ca5-a81e-01ef90fd06ed - - - - -] Excluding nova.compute.monitors.cpu monitor virt_driver. Not in the list of enabled monitors (CONF.compute_monitors). 2015-12-09 10:52:32.244 13748 INFO nova.compute.resource_tracker [req-39f672ac-46cb-4ca5-a81e-01ef90fd06ed - - - - -] Auditing locally available compute resources for node xxxx