> =A0-- C level backtrace information -------------------------------------=
------
> =A0/home/thomas/.rvm/rubies/ruby-1.9.2-p180/lib/libruby.so.1.9(rb_vm_bugr=
eport+0x72) [0xb76e5ac2]
> =A0/home/thomas/.rvm/rubies/ruby-1.9.2-p180/lib/libruby.so.1.9(+0x56271) =
[0xb75bf271]
> =A0/home/thomas/.rvm/rubies/ruby-1.9.2-p180/lib/libruby.so.1.9(rb_bug+0x3=
a) [0xb75bf36a]
> =A0/home/thomas/.rvm/rubies/ruby-1.9.2-p180/lib/libruby.so.1.9(+0x10851c)=
 [0xb767151c]
> =A0[0xb775a40c]
> =A0/home/thomas/.rvm/gems/ruby-1.9.2-p180/gems/therubyracer-0.9.0/ext/v8/=
v8.so(+0x549b5) [0xb6c649b5]
> =A0/home/thomas/.rvm/rubies/ruby-1.9.2-p180/lib/libruby.so.1.9(rb_gc_fina=
lize_deferred+0xba) [0xb75d55aa]

therubytracer seems gc unsafe. please try to don't use it.