segfault in MRI 1.8.7 that I tracked down with @slyphon

crash_a_187.rb

require 'thread'

# This seems to crash 1.8.7
10.times { Thread.new { Queue.new.pop } }
Process.waitpid fork { GC.start; puts "In child: #{$$}" }

crash_an_187.rb

require 'thread'

# This seems to crash 1.8.7 as well
10.times { Thread.new { m = Mutex.new; c = ConditionVariable.new; m.synchronize { c.wait(m) } } }
Process.waitpid fork { GC.start; puts "In child: #{$$}" }

lolruby.txt

$ ruby crash_a_187.rb
crash_a_187.rb:5: [BUG] Segmentation fault
ruby 1.8.7 (2011-12-28 patchlevel 357) [universal-darwin11.0]

$ ruby crash_an_187.rb 
crash_an_187.rb:5: [BUG] Segmentation fault
ruby 1.8.7 (2011-12-28 patchlevel 357) [universal-darwin11.0]

$