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From: Hleb Valoshka <375gnu@gmail.com>
Newsgroups: gmane.comp.lang.ruby.kgio.general
Subject: Test failure caused by commit 377028d99
Date: Wed, 4 Sep 2013 23:14:40 +0300
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On my Debian Sid with kernel 3.11-rc7 4 of 5 invocations of
test_poll_EINTR_changed finished with failure:

$ make test/test_poll.rb
ruby -I lib:tmp/ext/ruby-1.9.3/ext/kgio test/test_poll.rb 
Loaded suite test/test_poll
Started
..F
===============================================================================
Failure:
test_poll_EINTR_changed(TestPoll)
test/test_poll.rb:105:in `test_poll_EINTR_changed'
     102:     res = Kgio.poll(pollset, 1000)
     103:     diff = Time.now - t0
     104:     thr.join
  => 105:     assert_equal({@wr => Kgio::POLLOUT}, res)
     106:     assert diff < 1.0, "diff=#{diff}"
     107:     assert ok
     108:     ensure
<{#<IO:fd 6>=>4}> expected but was
<nil>

diff:
? {#<IO:fd 6>=>4}
? nil            
===============================================================================
......

Finished in 7.476580682 seconds.

9 tests, 22 assertions, 1 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
88.8889% passed

1.20 tests/s, 2.94 assertions/s

With commit 377028d99 (test_poll: avoid potentially thread-unsafe test)
reverted this test finishes successfully.