Sender: tim AT picard DOT skynet DOT be
Message-ID: <3B2F14DE.6D63C862@falconsoft.be>
Date: Tue, 19 Jun 2001 11:01:18 +0200
From: Tim Van Holder <tim DOT vanholder AT falconsoft DOT be>
Organization: Anubex N.V.
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To: neo_1061 AT hotmail DOT com, djgpp AT delorie DOT com
Subject: Re: Peculiar behavior of program.
References: <3b2efaa3 DOT 496489 AT news DOT primus DOT ca> <3B2F0771 DOT A2A1596A AT falconsoft DOT be> <3b2f09f2 DOT 4416801 AT news DOT primus DOT ca>
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Reply-To: djgpp AT delorie DOT com

Graaagh the Mighty wrote:
> 
> On Tue, 19 Jun 2001 10:04:01 +0200, Tim Van Holder
> <tim DOT vanholder AT falconsoft DOT be> sat on a tribble, which squeaked:
> 
> >This is all very interesting, but it would be a LOT more informative
> >and helpful if you posted the code that resulted in the broken
> >behaviour.
> 
> It's about a thousand lines long and the bug is *very* unstable --
> almost any change whatsoever stops it reproducing.

And we can hardly be expected to find the problem if we can't see the
code, now can we?

> I won't have a problem once I can get a decent traceback. Why is it
> not generating the "call frame traceback EIPs"? And why does it crash
> Windows? A protected mode task should be utterly unable to bring the
> OS down, unless it invokes a kernel function or device driver that is
> buggy or doesn't enforce its preconditions.

Bad memory accesses can do this too - you might be copying a lot of
data to a wild pointer which happens to point to part of your
executable code; when you then reach that code, it will execute
potentially invalid code that could totally screw up the system.
This definitely includes Windows 9x/ME rebooting - it does a lousy job
of
isolating a DOS box (or any app for that matter) from the rest of
the system.

-- 
Tim Van Holder - Anubex N.V.
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