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Re: An Obscure Bug



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?

> 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'). .
-- 
mulix

http://www.pointer.co.il/~mulix/
http://syscalltrack.sf.net/



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