[Building Sakai] Unresponsive jvm .. any suggestions?

[Kenwrick Chan]

Folks,
We're been running the same sakai codebase with no changes for well over a
year.  (2.7.x, we haven't had the resources to migrate yet).  Recently
we've run into an issue where an individual front end app server becomes
unresponsive.  In the days following we've upped the available memory to
the OS and the tomcat app server, but eventually it just fails to respond.

There seems to be a correlation in our catalina.out file to the following
error:

Exception in thread "Thread-29287" java.lang.RuntimeException:
Connection.freeWriteSemaphore(28847): semaphore not owned by any thread
at com.novell.ldap.Connection.freeWriteSemaphore(Unknown Source)
at com.novell.ldap.Message.putReply(Unknown Source)
at com.novell.ldap.Connection$ReaderThread.run(Unknown Source)
at java.lang.Thread.run(Thread.java:662)

which is pretty much like:
https://jira.sakaiproject.org/browse/SAK-23292

... enough of these errors and the jvm becomes unresponsive.

There are no errors on the ldap side of the house and our network guys say
there isn't an issue there impacting access to our ldap servers.  Any
suggestions?

-Kenwrick
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