Re: [MacRuby-devel] Segmentation fault for classes with multiple modules chained with super

31 Aug 2009


      On Tue, Sep 1, 2009 at 1:01 AM, Alexey Borzenkov<snaury@gmail.com> wrote:
...
The following program causes segmentation fault for me with the latest
macruby trunk:
class A
 def somemethod
   puts "A::somemethod"
 end
end
module B
 def somemethod
   super
   puts "B::somemethod"
 end
end
module C
 def somemethod
   super
   puts "C::somemethod"
 end
end
class D < A
 include B
 include C
 def somemethod
   super
   puts "D::somemethod"
 end
end
obj = D.new
obj.somemethod
Thanks to http://weblog.rubyonrails.org/2009/8/31/three-reasons-love-responder
I just found that modules can be chained via super like that, so I
immediately went to check it out, and in MRI 1.8 it works fine. I
wanted to see it in 1.9, so I checked with macruby and it caused
segmentation fault. I recompiled latest macruby trunk and it's still
happening. As stated in the README.rdoc I'm using llvm trunk at
revision 72741. Is it llvm or macruby bug? Oddly, under gdb it just
freezes, can't even see any stack trace. :-/
Correction: if I printed before calling super I'd see that it causes
infinite recursion. Seems like it shouldn't be doing that...