On 24 Apr 2012, at 15:57, Curtis Olson wrote:
> I tried running with valgrind and the error didn't happen -- hmmm...
>
> Trying it again, but a valgrind startup is excruciatingly slow ...
It's probably a reference counting issue. FGAirport is a FGPositioned and hence
reference counted. The Nasal Ghost is supposed to deal with this - when we
create a ghost around the airport, we take a reference (SGReferenced::get) and
when Nasal garbage-collects the ghost, the reference count is decremented.
(SGReferenced::put)
If the reference count hits zero, the airport will be freed, leading to the
issue you see. But that would imply there's nothing else holding a reference to
the airport, and that's not the case, because the the spatial index (the
octree) in positioned.cxx holds a reference to everything at the moment.
If I'd screwed up the ref-counting logic completely, I'd expect it to be
crashing for me exactly the same, and it's not. Very weird.
So likely I have made a subtle screw-up that only affects Linux. You could test
this by commenting out the call to
SGreferencd::put()
in sgrefGhostDestroy - references will be leaked, but if it stops the crash
then we can be sure it's a ref-counting bug.
James
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