Article on debugging memory problems

Hi all,

when I recently had to debug some annoying refcount-related memory 
problem in a moderately large body of XS code, I took the opportunity to 
write a blog post about the fun I failed to have. Specifically 
interesting for (part of) this group might be the discussion of perl 
Configure options to get the most help out of perl. 
(DEBUG_LEAKING_SCALARS and friends, PERL_POISON, etc., but mostly spends 
time explaining some of the basics).

Comments, corrections, and additions are most welcome.

http://blog.booking.com/the-dreaded-attempt-to-free-unreferenced-scalar.html

--Steffen

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