@rough-minister-58256: mm, yea... maybe. the stack is

File "/opt/ee/python/2.7/lib/python2.7/threading.py", line 174 in acquire
  File "/Users/stuhood/.pex/install/pantsbuild.pants-1.4.0.dev16+899381073-cp27-none-macosx_10_8_x86_64.whl.46445b2c7acbf09afd084ac31d3da3e261ae5636/pantsbuild.pants-1.4.0.dev16+899381073-cp27-none-macosx_10_8_x86_64.whl/pants/bin/engine_initializer.py", line 96 in create_build_graph

before https://github.com/pantsbuild/pants/pull/5178 and inside the engine after it