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Re: An Obscure Bug



Didn't segfault on RH7.1, gcc-2.96-85, glibc-2.2.4-19, would you 
please explain the change in your program that solves the segfault?


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. 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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-- 
Behdad
13 Azar 1380, 2001 Dec 4

[Finger for Geek Code]


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