snmp_parse_oid crashes multi-threaded application

[Toth, G. S <gre...@bo...>]

We are seeing snmp_parse_oid cause a multi-threaded SNMP management
application to crash.  The main thread initializes snmp and supposidly does
the mib parsing with the following code:

	init_snmp("");
	snmp_session *temp= new snmp_session;
	snmp_sess_init(temp);
	delete temp;

It then creates a second thread which creates a c++ object which opens a
single session snmp session pointing to the remote agent and returns a
reference to this object back to the original thread.

The second thread is then destroyed but the c++ object's destructor is not
called so that it still exists and the first thread still has access to it.

Later the first thread attempts to send a snmp request from this object.
The application crashes during snmp_parse_oid in the c++ object due to a
memory violation.

We can see the parameters being passed to snmp_parse_oid using the debugger
on the core file and they look ok.

Is there any way the MIB tree that got created by the snmp_sess_init in the
main thread could have been corrupted?  This is about the only thing I can
think that could be causing this to happen.