If a user gives an invalid value for the opal_signal MCA parameter, such
as in the command:
mpirun -mca opal_signal x /bin/ls
the error produced by Open MPI 1.6.3 is:
--------------------------------------------------------------------------
It looks like opal_init failed for some reason; your parallel process is
likely to abort. There are many reasons that a parallel process can
fail during opal_init; some of which are due to configuration or
environment problems. This failure appears to be an internal failure;
here's some additional information (which may only be relevant to an
Open MPI developer):
opal_util_register_stackhandlers failed
--> Returned value -5 instead of OPAL_SUCCESS
--------------------------------------------------------------------------
which claims to be an internal error, not an invalid argument given by a
user. That parameter also appears to be poorly documented in general
(mentioned in ompi_info -a and on the mailing lists), and seems like it
would be an incredibly useful debugging tool when running a crashing
application under a debugger.
-- Jeremiah Willcock
