Wow, never seen a C backtrace in Rails before

-- C level backtrace information -------------------------------------------
0   libruby.2.2.0.dylib                 0x0000000103e6e885 rb_vm_bugreport + 149
1   libruby.2.2.0.dylib                 0x0000000103d0dbb4 rb_bug + 468
2   libruby.2.2.0.dylib                 0x0000000103d0deac rb_bug_errno + 92
3   libruby.2.2.0.dylib                 0x0000000103e7cb2c thread_timer + 588
4   libsystem_pthread.dylib             0x00007fffbb4ac9af _pthread_body + 180
5   libsystem_pthread.dylib             0x00007fffbb4ac8fb _pthread_body + 0

-- Other runtime information -----------------------------------------------

* Loaded script: bin/rails

* Loaded features:

    0 enumerator.so
    1 rational.so
    2 complex.so