help debugging segfaults

On Thu, 13 Jun 2002 08:38:32 -0400, you wrote in message
<51F9C42DA15CD311BD220008C707D81906FFC35C@usrymx10.merck.com>:

Hi all,

Thanks to Prof. Ripley, Prof. Gentleman, and Simon Wood (did I miss
anyone?).  The problem seemed to have gone away.

Everyone suggested using some malloc debugger (such as Electric Fence).  All
I did was following half of what BDR suggested below, i.e., changing all the
S_alloc() calls to Calloc() and Free().  I didn't get to try efence, and the
problem seems to have disappeared!

In my experience, that's not such good news.  The bug is probably
still there, it just doesn't have obvious symptoms in the tests you're
using.  I'd still recommend using the malloc debugger to try to track
it down.

Duncan Murdoch
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