Bug#334942: marked as done (gcc-4.0-base: Large local arrays in function lead to segmentation fault)
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>From Alexander.wagner@ndsu.edu Thu Oct 20 17:46:19 2005
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From: Alexander Wagner <Alexander.wagner@ndsu.edu>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: gcc-4.0-base: Large local arrays in function lead to segmentation fault
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Date: Thu, 20 Oct 2005 19:46:16 -0500
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Package: gcc-4.0-base
Version: 4.0.2-2
Severity: important
When I compile and run the following program the definition of the
arrays in the function leads to a segmentation fault when I try to
access the "i" array. gdb tells me "Cannot access memeory address"
Here is a minimal test program that shows the error (at least on my
system):
#include <stdio.h>
#include <stdlib.h>
#define xdim 1000
#define ydim 1000
void analysis(){
double ddphi[xdim][ydim],mu[xdim][ydim];
int i[3];
i[1]=1;
}
int main(int argc, char *argv[]){
analysis();
return 0;
}
Presumably a work around is to avoid large local arrays and to replace
them with global arrays, or if there is not enough space with allocated
pointers. But I use these programs while teaching Physics, and the first
option makes the programs less readable and the second option excceds
the ability of many students.
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-1-k7-smp
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
-- no debconf information
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>From doko@cs.tu-berlin.de Fri Nov 18 07:14:14 2005
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From: Matthias Klose <doko@cs.tu-berlin.de>
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Message-ID: <17277.61379.582129.711913@gargle.gargle.HOWL>
Date: Fri, 18 Nov 2005 16:14:11 +0100
To: 334942-done@bugs.debian.org
Subject: Re: gcc-4.0-base: Large local arrays in function lead to segmentation fault
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Not a bug, you need to increase the stack size of the process, which
is set to 8k by default.
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