Build images freezes on infinite time

log_strase.tar.gz - contains logs with strace.
As workaround was found parameter "--builder-workers 1"
for mcp-microservices ...

How many cpu this environment has?

multiprocessing.cpu_count() shows 2

Not reproduced on master with 2 workers.

Do you need the environment with reproduced bug?

Confirmed.

1. Deploy k8s using kargo_deploy.sh (kubernetes v1.3.0)

2. Upload k8s_topology.yaml to the /home/vagrant from https://review.openstack.org/#/c/342175/22/mcp_tests/templates/k8s_templates/k8s_topology.yaml

3. Run the command (on node1):
ccp --images-base-distro debian --images-maintainer <email address hidden> --repositories-protocol https --repositories-port 443 --builder-push --registry-address 127.0.0.1:31500 --logfile /var/log/microservices.log --verbose --debug --builder-workers 1 --registry-insecure --images-tag test_latest --deploy-config ~/k8s_topology.yaml --images-namespace mcp build

Result:
1. Registry was started on node4:
root@node1:~# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
registry 1/1 Running 1 1h 10.233.67.130 node4

, port 31500 is available on localhost (with hypercube proxy):
root@node1:~# telnet 127.0.0.1 31500
Trying 127.0.0.1...
Connected to 127.0.0.1.

2. The command "ccp --images-base-distro ..." stucks on waiting for something (more than 2 hours at the moment):
root 29000 0.3 1.1 284836 72588 ? Sl 11:38 0:18 /usr/bin/python /usr/local/bin/ccp --images-base-distro debian ...

root@node1:~# strace -p 29000
strace: Process 29000 attached
select(0, NULL, NULL, NULL, {0, 9968}) = 0 (Timeout)
gettimeofday({1471439555, 96633}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
gettimeofday({1471439555, 146955}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
gettimeofday({1471439555, 197301}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
gettimeofday({1471439555, 247599}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
gettimeofday({1471439555, 297885}, NULL) = 0
select(0, NULL, NULL, NULL, {0, 50000}) = 0 (Timeout)
...

Not reproduced last 3 month on CI and dev envs