All -

A recent security patch on the Open MPI Jenkins setup has appeared to have 
caused some fairly significant instability.  Something in our build 
configuration is causing Jenkins to become unresponsive to any scheduling 
changes (including completing jobs or starting new testing instances).  The 
problem doesn’t occur every time, but has happened three times in the last week.

It appears at least part of the problem is the EC2 plug-in.  Unfortunately, I 
will not have time to investigate further until this weekend at the earliest.  
I have disabled the Open MPI pull request builder job so that other tests can 
run to completion.  I’m going to start trying to eliminate causes this weekend, 
but in the mean time, please exercise care when merging.

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