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Need help finding heap corruption bug

From: Pat Lasswell
Subject: Need help finding heap corruption bug
Date: Sun, 17 Sep 2006 11:13:53 -0700

In guile 1.6.8 on an intel mac, I've encountered reliable heap corruption with steps like the following

% guile
guile> (use-modules (project all))
guile> (set-current-module (resolve-module '(project foo)))
guile> (load "foo.scm")
==> segmentation fault

(project all) is a module that loads all of the prerequisites and submodules (about 4k lines total) and exports symbols.  These steps happen in the directory 'project' containing ' main.scm' and 'foo.scm'.

I have two questions.  Is there something intrinsically wrong with with setting the current module to the one on which I am actively working and then just reloading that file rather than the entire suite?  ( I.e., there are usually a lot of testing steps between the 'set-current-module' form and the 'load' form; however, the steps above will always produce a crash.)

My second question is this: given that the answer to 1) is no, how do I track this pest down?  Placing an undefined identifier, say 'x', at various points in one of the modules will sometimes produce the appropriate warning, sometimes produce a segfault, other times a bus error or illegal instruction or even an abort during gc.  I have run attached to gdb, but I get a deep stack (131 frames) ending with, e.g.

#0  scm_gc_sweep () at ../../../src/guile-1.6.8/libguile/gc.c:1729
#1  0x0021f573 in scm_igc (what=0x26c720 "cells") at ../../../src/guile-1.6.8/libguile/gc.c:1161
#2  0x0021fa83 in scm_gc_for_newcell (master=0x273440, freelist=0x273438) at ../../../src/guile- 1.6.8/libguile/gc.c:985
#3  0x00238aef in scm_cons (x=0x6826c0, y=0x2974) at ../../../src/guile-1.6.8/libguile/pairs.c:84
#4  0x00216b87 in scm_deval (x=0xc3028, env=0x682480) at ../../../src/guile-1.6.8/libguile/eval.c:2835
#5  0x00219af5 in scm_deval (x=0xc3030, env=0x682480) at ../../../src/guile-1.6.8/libguile/eval.c:2819

Are there guile primitives to verify the heap?

_Any_ help would be appreciated.

Thanks in advance

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