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Date:	Thu, 12 Aug 2004 13:11:32 +0200
From:	"Gerrit P. Haase" <gp AT familiehaase DOT de>
Reply-To:	"Gerrit @ cygwin" <cygwin AT cygwin DOT com>
Organization:	Esse keine toten Tiere
Message-ID:	<1535099350.20040812131132@familiehaase.de>
To:	user AT lngs DOT infn DOT it
CC:	cygwin AT cygwin DOT com
Subject:	Re: simple C program crashes at run time
In-Reply-To:	<200408121041.MAA00181@gsnet0.lngs.infn.it>
References:	<1092304835 DOT 13420 DOT ezmlm AT cygwin DOT com> <200408121041 DOT MAA00181 AT gsnet0 DOT lngs DOT infn DOT it>
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Hallo user,

Am Donnerstag, 12. August 2004 um 12:47 schriebst du:


> #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..

See stackdump: STATUS_STACK_OVERFLOW

> Thanks in advance for help. bye.

Increase the stack (only possible during buildtime):
$ gcc -o unlucky unlucky.c -Wl,--stack,8388608

$ ./unlucky.exe
init start...
init end.....
all done.....



Gerrit
-- 
=^..^=



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