1 files changed, 11 insertions, 0 deletions
diff --git a/Lib/test/test_bz2.py b/Lib/test/test_bz2.py
index 4646f02..366ab7a 100644
--- a/Lib/test/test_bz2.py
+++ b/Lib/test/test_bz2.py
@@ -120,6 +120,17 @@ class BZ2FileTest(BaseTest):
         self.assertEqual(list(iter(bz2f)), sio.readlines())
         bz2f.close()
 
+    def testClosedIteratorDeadlock(self):
+        # "Test that iteration on a closed bz2file releases the lock."
+        # http://bugs.python.org/issue3309
+        self.createTempFile()
+        bz2f = BZ2File(self.filename)
+        bz2f.close()
+        self.assertRaises(ValueError, bz2f.__next__)
+        # This call will deadlock of the above .__next__ call failed to
+        # release the lock.
+        self.assertRaises(ValueError, bz2f.readlines)
+
     def testWrite(self):
         # "Test BZ2File.write()"
         bz2f = BZ2File(self.filename, "w")