Comment 2 for bug 1518430

I could confirm that I could observe this bug definitely on Liberty on following services: neutron-server, nova-conductor. I couldn't confirm that for other because it requires additional monitoring/debugging.
Steps to reproduce for neutron-server:

1.Deploy new cloud.
2. Measure CPU and MEM usage by neutron-server and take a look on strace of any pid which is associated with RPC worker.
3. Create 200-400 networks with routers.
4. Spawn 10000 vms (not at once, you could just spawn and delete them by 10-20 pcs).
5. Delete everything (networks, routers, vms).
6. Measure CPU/MEM usage and take a look on strace of neutron-server RPC worker.

Expected behavior:
Everything should be the same as at step 2 with non-significant changes in CPU/MEM.

Observer behavior:
Huge CPU load (1-2 cores), huge MEMORY load (6-7Gb) without doing anything useful at the moment ;) Stracing of RPC thread will show ~1k per second of EPOLL_WAITs with 0 timeout.