From:	dcasale AT my-deja DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: free() error
Date:	Fri, 13 Oct 2000 01:04:14 GMT
Organization:	Deja.com - Before you buy.
Lines:	45
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References:	<39e36135 AT news DOT vogel DOT pl>
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In article <39e36135 AT news DOT vogel DOT pl>,
  "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?

I recently had a very similar problem.  My program seemed to work fine
in debug mode, but when I compiled a release version it would crash
every time with a similar error in free.  It turned out that I had
forgotten to initialize some buffer size information.

Check and make sure that _all_ of your variables have been initialized,
and that you're not deleting objects which have already been deleted.
Run your program under a debugger or stick printf's everywhere and
carefully examine the state of your variables.  See if any of them have
been corrupted or uninitialized.

Damon Casale, damon AT redshift DOT com
Just a friendly pointer...


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