No one else mentioned debugging the core files. Core files are produced when a program segfaults and contain the final state of the program. A debugger can reconstruct the stack trace and at least tell you where it crashed. If you see a "core" file in the current directory, then you can debug it with gdb: 
gdb /usr/bin/perl core

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If perl isn't producing core files when it segfaults, you may need to change the process limits. On many systems, it is set to not create core files on crashes. 
ulimit -c 10000000

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In reply to Re: How to debug a segfault? by iburrell
in thread How to debug a segfault? by Anonymous Monk

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