Bug #1066: Frequent failure: test_io.rb test 2 on OS X 10.5.6
http://redmine.ruby-lang.org/issues/show/1066

Author: Mike Stok
Status: Open, Priority: Normal
Category: test, Target version: 1.9.1
Reproducible Version: trunk

Many times when I build the ruby trunk downloaded from http://svn.ruby-lang.org/repos/ruby/trunk the test_io.rb output is:

test_io.rb .F......................................................

and at the end of the tests there is this failure message:

#223 test_io.rb:11:in `<top (required)>': 
     begin
       require "io/nonblock"
       r, w = IO.pipe
       w.nonblock = true
       w.write_nonblock("a" * 100000)
       w.nonblock = false
       t1 = Thread.new { w.write("b" * 4096) }
       t2 = Thread.new { w.write("c" * 4096) }
       sleep 0.5
       r.sysread(4096).length
       sleep 0.5
       r.sysread(4096).length
       t1.join
       t2.join
     rescue LoadError
     end
  #=> not finished in 10 seconds  [ruby-dev:32566]
FAIL 1/928 tests failed
make: *** [btest-ruby] Error 1

Maybe one time in twenty it succeeds, but I have not tried to check whether this is revision dependent.  The latest revision I tested and which failed the test was 21852


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