From: Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: free() error
Organization: Pin Eight Software  http://pineight.8m.com/
Message-ID: <edq6usk7vhlvrlmou2lmdnuhvv1krm060t@4ax.com>
References: <39e36135 AT news DOT vogel DOT pl>
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NNTP-Posting-Date: Tue, 10 Oct 2000 19:12:45 GMT
Distribution: world
Date: Tue, 10 Oct 2000 19:12:46 GMT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

On Tue, 10 Oct 2000 20:36:07 +0200, "Chaos" <chengin AT alpha DOT net DOT pl>
wrote:

>From time to time (meaning quite randomly) I have my program crash  leaving
>such information:
>
>ebp=0009e748 esp=0009e73c program=C:\MOJE\PROGRAMY\CARZ\V3.EXE
>cs: sel=00a7  base=83564000  limit=ffaeafff
>ds: sel=00af  base=83564000  limit=ffaeafff
>es: sel=00af  base=83564000  limit=ffaeafff
>fs: sel=0087  base=00007ae0  limit=0000ffff
>gs: sel=00bf  base=00000000  limit=0010ffff
>ss: sel=00af  base=83564000  limit=ffaeafff
>App stack: [0009e7d0..0001e7d0]  Exceptn stack: [0001e6b8..0001c778]
>
>Call frame traceback EIPs:
>  0x000051a0   _free+172
>  0x00002dec   _main+2004, line 962 of V3.c
>  0x00003ece   ___crt1_startup+174
>
>C:\Moje\programy\Carz>symify V3.exe
>
>On what side the eror/bug hides: mine or free function?
>Program crash's usually in Win98 DOSbox. But the strangest is that it blowes
>himself away random (once it works OK and some other time it always leaves
>with "registers prompt"). Can U tell me what can I do 2 fix it?

You probably have a buffer overflow somewhere, writing garbage over
the data structure that malloc()/free() uses to keep track of the
heap.  For more information, look in DJGPP FAQ entry 9.2.  YAMD, yet
another malloc() debugger by Nate Eldredge, may help:
  http://www3.hmc.edu/~neldredge/yamd/

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