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segmentation fault
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From: Alexander Wagner <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
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.
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From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Fri, 18 Nov 2005 16:14:11 +0100
To: [EMAIL PROTECTED]
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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