python -m unittest fails with large number of processes

[TocarIP]

Running mpiexec -n 4 python -m unittest on master fails with:

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   PID 17975 RUNNING AT antsatel03
=   EXIT CODE: 139
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================

We need to investigate this

[TocarIP]

Guilty test is hpat.tests.test_hiframes.TestHiFrames.test_crosstab_parallel1

[ehsantn]

In many cases, parallel crashes are caused by some parallel routine called with small chunks of data on some processor, which triggers some corner cases.