[erlang-questions] rebar eunit dies with {"Kernel pid terminated", error_logger, killed}

[Roger Lipscombe]

I'm using rebar (rebar 2.6.1 R15B03 20150928_141254 git 2.6.1) to run
eunit, and it's failing on OS X with {"Kernel pid
terminated",error_logger,killed}. The same project run on Linux, with
the same version of rebar, runs successfully.

How do I go about figuring out what's wrong with it?