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Re: guile 1.9.0 scm_read_hash_extend gc trouble

From: Bill Schottstaedt
Subject: Re: guile 1.9.0 scm_read_hash_extend gc trouble
Date: Mon, 22 Jun 2009 10:23:09 -0700

> Can you spot some way in which what you are doing 
> is different to this? 

I believe this is a GC problem; you're doing exactly what I'm doing,
but in a context where the GC is not called.  If I place the
skip comment function in its own file, and compile it
with optimization turned off, everything is happy; if
optimization is on (either -O or -O2), it dies.  According to
valgrind the problem is in scm_getc -- the SCM_PTAB_ENTRY
pointer "pt" does not point to a valid structure, so the read
and subsuequent write through pt goes off into unallocated
memory.  I haven't tracked down the actual problem yet,
but gc-protecting the "port" variable does no good.

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