Fiber seg fault

crash.rb

require 'rubygems'
require 'eventmachine'
require 'fiber'

EM.run{ Fiber.new{}.resume }

__END__

/Users/bgessler/Desktop/crash.rb:6: [BUG] Segmentation fault
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.1.0]

-- control frame ----------
c:0009 p:---- s:0025 b:0025 l:000024 d:000024 CFUNC  :resume
c:0008 p:0021 s:0022 b:0022 l:001ec8 d:002478 BLOCK  /Users/bgessler/Desktop/crash.rb:6
c:0007 p:---- s:0020 b:0020 l:000019 d:000019 FINISH
c:0006 p:---- s:0018 b:0018 l:000017 d:000017 CFUNC  :call
c:0005 p:---- s:0016 b:0016 l:000015 d:000015 CFUNC  :run_machine
c:0004 p:0248 s:0013 b:0013 l:000012 d:000012 METHOD /Users/bgessler/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179
c:0003 p:0051 s:0006 b:0006 l:001ec8 d:001ac8 EVAL   /Users/bgessler/Desktop/crash.rb:5
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:001ec8 d:001ec8 TOP   
---------------------------
-- Ruby level backtrace information ----------------------------------------
/Users/bgessler/Desktop/crash.rb:5:in `<main>'
/Users/bgessler/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `run'
/Users/bgessler/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `run_machine'
/Users/bgessler/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `call'
/Users/bgessler/Desktop/crash.rb:6:in `block in <main>'
/Users/bgessler/Desktop/crash.rb:6:in `resume'

-- C level backtrace information -------------------------------------------

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

Abort trap: 6