The lock discovery used in the Hang Analyzer GDB module mongo_lock.py invokes functions to retrieve lock data. This approach has the following side affects:

• Only works for a live process, and not with a core dump
• When the function is called, other threads can run, which may change the state of the lock tables

A preferable method would be to inspect memory, including the complex C++ std structures, like iterating over an ordered Map. Since this is a difficult undertaking, it may be possible using a third party module, like the Tr1UnorderedMapPrinter class found in /opt/mongodbtoolchain/v2/share/gcc-5.4.0/python/libstdcxx/v6/printers.py