merge revision(s) 64007,64019,64020: [Backport #14929]

	thread.c (do_select): fix leak on exception

	When do_select is interrupted and raise happens from
	RUBY_VM_CHECK_INTS_BLOCKING, the original FD sets we copied
	do not get freed, leading to a memory leak.  Wrap up all the
	FD sets into a Ruby object to ensure the GC can release an
	allocations made for rb_fdset_t.

	This leak existed since Ruby 2.0.0 (r36430)

	[Bug #14929]

	increase timeout seconds.
	* test/ruby/test_io.rb (test_select_leak): increase timeout seconds
	  to pass this test on a high-load machine.


	60 sec is not enough at all


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@64561 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 16 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 034dac570c..dc99a8c463 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -3549,4 +3549,20 @@ __END__
       end
     end
   end
+
+  def test_select_leak
+    assert_no_memory_leak([], <<-"end;", <<-"end;", rss: true, timeout: 60)
+      r, w = IO.pipe
+      rset = [r]
+      wset = [w]
+      Thread.new { IO.select(rset, wset, nil, 0) }.join
+    end;
+      20_000.times do
+        th = Thread.new { IO.select(rset, wset) }
+        Thread.pass until th.stop?
+        th.kill
+        th.join
+      end
+    end;
+  end
 end