in reply to Getting full traceback from (someone elses) XS routine

I have one more idea ;-) 
PERLDB_OPTS="NonStop AutoTrace LineInfo=lines frame=1" perl -d your_sc
+ript.pl

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If you are lucky, the last lines hint you to the calling location. Hopefully the lines file is flushed if your script croak. I do not know.
Boris

In Section Seekers of Perl Wisdom