Hi all!

Well, now I have come closer to the answer. I patched my interp.c so
that when it normally failed - after oopHasOKclass(anOop) returns 0, I
called oopHasOKclass() once more, so that I could step through it line
by line.

It appears to me in insight/gdb that foo->endOfMemory is negative (sign
bit gotten set?) so the interval check that looks like this:

        if (!((0 < oop) && (oop < foo->endOfMemory))) {
                return 0;
        }

...fails.

Hmmm, ok - so has this worked until now just because of luck? Has memory
normally been mapped below 32 bits, and now with kernel 2.6 (for
example) Linux decides to place Squeak above it sometimes? And is the
problem simply that we can't treat endOfMemory as a signed int?! And did
Greece really go to the Euro championship soccer final yesterday? It
seems so.

Here are the shocking evidence (in the form of png images) from my
insight expedition into VM low level country, with assembler and all:

	http://anakin.bluefish.se/gohu/uploads/4/bughunt.zip

Over and out from VM-expeditioner-newbie Göran Krampe, who is now
jumping on a bus going home to eat a nice dinner and drink some wine
with his wonderful wife hoping that someone else can bring order into
this situation. :)

regards, Göran