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Message-Id: <200408121041.MAA00181@gsnet0.lngs.infn.it>
Date: Thu, 12 Aug 2004 12:47:32 +0200
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Subject: simple C program crashes at run time
From: <user AT lngs DOT infn DOT it>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define  TAGLIA  415
main()
{

   int i, j, k, iran;
   unsigned int seed;
   float  unran;
   float  mata[TAGLIA][TAGLIA],
          matb[TAGLIA][TAGLIA],
          matc[TAGLIA][TAGLIA];

   srand(seed);
   printf("init start...\n");

/* this should init all elements with pseudo-random float values */
   for(i=0;i<TAGLIA;i++)
   {
     for(j=0;j<TAGLIA;j++)
     {
       iran=rand(); unran = iran / 1.0E10;
       mata[i][j]=unran;
       iran=rand(); unran = iran / 1.0E10;
       matb[i][j]=unran; matc[i][j] = 0.0;
     }
   }
   printf("init end.....\n");

/* do something to grab cpu-time */  
   for(i=0;i<TAGLIA;i++)
   {
     for(j=0;j<TAGLIA;j++)
     {
       for (k=0;k<TAGLIA;k++)
          matc[i][j]=matc[i][j]+mata[i][k]*matb[k][j];
     }
   }

   printf("all done.....\n");
}


No informational and/or warnings while building it:

gcc unlucky.c -o unlucky.exe


It works for  TAGLIA < 416
With TAGLIA = 416 it looks unusually fast and without outputs
with TAGLIA > 416 it crashes:
 
sysnaz AT wngsnt ~
$ ./unlucky.exe
Segmentation fault (core dumped)

$ more unlucky.exe.stackdump
Exception: STATUS_STACK_OVERFLOW at eip=00401593
eax=00001774 ebx=00000004 ecx=00032064 edx=00401098 esi=610F3060
edi=61005AC0
ebp=0022F068 esp=0022F05C program=d:\cygwin\home\sysnaz\unlucky.exe,
pid 1232, thread main
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame     Function  Args
0022F068  00401593  (00000001, 616D5310, 0A0500A8, 0022F0C0)
0022F0A8  61005F54  (0022F0C0, 00000000, 00000000, 00000000)
0022FF88  6100616B  (00000000, 00000000, 00000000, 00000000)
End of stack trace

What does it happen? the same code built on linux doesn't 
crashes..

Thanks in advance for help. bye.
____________________________________________________________________




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