This morning a server abended. looking at the abend.log file, we see the
problem was in clstrlib.nlm.

Here's my question. Did the cluster modules cause the server to abend or
did the cluster modules issue a poison pill? I can't tell either from the
log file nor from looking at the event logs in C1, which frankly offers
very little information to begin with.

How do we know if a poison pill got issued?