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An Obscure Bug
- To: <linux-il(at-nospam)linux.org.il>
- Subject: An Obscure Bug
- From: Shlomi Fish <shlomif(at-nospam)techst02.technion.ac.il>
- Date: Tue, 4 Dec 2001 17:39:53 +0200 (IST)
- Delivered-To: linux.org.il-linux-il@linux.org.il
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
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. 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.
I'll appreciate if anyone can shed some light on the subject.
Regards,
Shlomi Fish
----------------------------------------------------------------------
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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