From: Danie Roux <danie.roux@...>
Date: 2006-02-20T07:47:40+09:00
Subject: GC Bug? Ruby 1.8.4 core dumps on a very small extension

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Hi all,

Long (and tiring) story short:

I have an extension that is 40 lines* in total, the C code and Ruby
code that exercise it. It core dumps, while I repeatedly call a method
that just returns Qtrue.

All it really does is:

rb_iv_set(self, "@v", 100);

in initialize. If I change that 100 to 99, it doesn't core dump.
Change it back to 100, it core dumps within a few seconds.

Further, the while loop that executes it looks like this:

while true
    print ''
    b.buzz
end

If I take out the print statement, it keeps on running. Put back the
print statement, and it core dumps.

This is a self-compiled 1.8.4 on Ubuntu i386. A friend confirms that
the same thing happens to him on Gentoo with 1.8.4.

I am attaching the code, hopefully its going to come through.

* It was around 600, and use to core dump every 8 hours or so.
Snipping it down to these 40 lines was pure blind luck, and many 8
hour turnaround iterations.

--
Danie Roux *shuffle* Adore Unix               http://blog.acolyte.co.za

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