Hang while stopping Couchbase server with connected DCP client

For this DCP test:
./testrunner -i ../ericsvms.ini -t dcp.crashtests.DCPCrashTests.test_crash_while_streamingreset

I see hang while test runner stop the Couchbase server with the /etc/init.d/couchbase-server stop command.

Note that:

• this occurs on CentOS, not Windows
• if I reduce the kvs from 10000 to 1000 the problem does not occur
• if I set a break point before test runner stops the server and do a stop from the command line it will hang, but when I control/c out of pdb the hang does not hang anymore i.e. the stop completes successfully.