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To: Nate Williams <nate@mt.sri.com>
cc: Keith Mitchell <kmitch@unix.guru.org>, current@freebsd.org
Subject: Re: Weirdness in current 
In-reply-to: Your message of "Thu, 17 Oct 1996 12:05:15 MDT."
             <199610171805.MAA19142@rocky.mt.sri.com> 
Date: Thu, 17 Oct 1996 20:39:12 +0200
Message-ID: <4105.845577552@critter.tfs.com>
From: Poul-Henning Kamp <phk@critter.tfs.com>
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In message <199610171805.MAA19142@rocky.mt.sri.com>, Nate Williams writes:
>> > Where is it dumping core?
>> 
>> I checked my program again and did find a small bug in it that would cause
>> it to reference an array out of bounds.  Its amazing that compiling in the
>> math library would fix this and the dynamic/static executable made a
>> difference. ;-)  And at that only on output redirection.  Go Figure. ;->>
>
>Stack corruption bugs are a *bugger* to find.  The program has a
>completely different 'memory' allocation setup when used static
>vs. shared libraries due to mmap() usage in the shlib loader.
>
>In any case, we're glad everything's working now. :)

I don't know of any reliable & simple way to catch that kind of bug.

I once made a gross hack on a Pyramid, such that checksum of the stack
was made at every function call and record written to file at the
return recording match/nomatch.

Crude but it worked :-)

--
Poul-Henning Kamp           | phk@FreeBSD.ORG       FreeBSD Core-team.
http://www.freebsd.org/~phk | phk@login.dknet.dk    Private mailbox.
whois: [PHK]                | phk@ref.tfs.com       TRW Financial Systems, Inc.
Future will arrive by its own means, progress not so.