Satellite 5 performance: apparent deadlocks with Hibernate C3P0 pools (tomcat catalina, rhn search and taskomatic etc)

Issue

• "APPARENT DEADLOCK" warning messages are found in Satellite 5.6 or 5.7 logs such as /var/log/tomcat6/catalina.out log or /var/log/rhn/rhn_taskomatic_daemon.log:

INFO   | jvm 1    | 2016/01/07 10:19:44 | Jan 7, 2016 10:19:44 AM com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run
INFO   | jvm 1    | 2016/01/07 10:19:44 | WARNING: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@5c885c88 -- APPARENT DEADLOCK!!! Complete Status: 

• If running external Oracle database the logs indicate processes are being killed:

Process q003 died, see its trace file                                                        
Thu Jan  7 10:19:44 2016                                                                     
ksvcreate: Process(q003) creation failed                            

• possibly accompanied by high memory / cpu usage