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Re: An Obscure Bug
- To: mulix <mulix(at-nospam)actcom.co.il>
- Subject: Re: An Obscure Bug
- From: Shlomi Fish <shlomif(at-nospam)techst02.technion.ac.il>
- Date: Wed, 5 Dec 2001 09:14:16 +0200 (IST)
- Cc: <linux-il(at-nospam)linux.org.il>
- Delivered-To: linux.org.il-linux-il@linux.org.il
- In-Reply-To: <Pine.LNX.4.33.0112042305460.5685-100000@alhambra.merseine.nu>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
On Tue, 4 Dec 2001, mulix wrote:
> On Tue, 4 Dec 2001, Shlomi Fish wrote:
>
> > I discovered an obscure bug which I am able to reproduce only under very
> > rare circumctances. Here are the instructions for re-producing it:
> >
> > Download
> > http://vipe.technion.ac.il/~shlomif/obscure-bug.tar.gz
> >
> > Unpack and type make. Then type "source test.sh" at the command line and
> > press enter. Voila - a segfault.
> >
> > Now, "./test.sh" doesn't cause it.
>
> this is imperative - 'source test.sh' causes it, but './test.sh'
> doesn't?
>
Indeed that is the case.
> > The program in question was written by
> > me (it's version 1.11.24 of Freecell Solver), and is compiled with the
> > "-O3" flag by gcc. If it's compiled with "-O2" it doesn't segfault.
> > Nor does it when compiled with kgcc. Moreover, after I made a very small
> > change in the program, it did not segfault either. Finally, running it
> > under gdb cause it not to crash either.
> >
> > I'm using Mandrake 8.1 with KDE 2.2.1 and all of the up-to-current
> > updates. My kernel is 2.4.13-12mdk from cooker.
>
> which gcc?
> it ran fine with gcc2.91.66, gcc2.95.2 and gcc3.0 (using 'source
> test.sh'). .
You can find the complete list of packages on my system here:
http://vipe.technion.ac.il/~shlomif/rpm-qa.txt
I believe some of them contains proprietary patches by Mandrake-soft.
Regards,
Shlomi Fish
> --
> mulix
>
> http://www.pointer.co.il/~mulix/
> http://syscalltrack.sf.net/
>
>
----------------------------------------------------------------------
Shlomi Fish shlomif@t2.technion.ac.il
Home Page: http://t2.technion.ac.il/~shlomif/
Home E-mail: shlomif@techie.com
If:
1. A is A
2. A is not not-A
does it imply that
1. B is B
2. B is not not-B
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