Do not del libev IO wrappers while thread is still running

aholmberg · aholmberg · commit 8d36b5ca1469 · 2015-08-14T09:28:34.000-05:00
fixes an issue where the runtime would occasionally segfault when
exiting without cluster shutdown. This is because the IO object was
deacllocated while the thread was running and might still enter the IO
callback.
diff --git a/cassandra/io/libevreactor.py b/cassandra/io/libevreactor.py
@@ -123,10 +123,8 @@ def _cleanup(self):
             conn.close()
             if conn._write_watcher:
                 conn._write_watcher.stop()
-                del conn._write_watcher
             if conn._read_watcher:
                 conn._read_watcher.stop()
-                del conn._read_watcher
 
         self.notify()  # wake the timer watcher
         log.debug("Waiting for event loop thread to join...")
