[3.7] bpo-33769: start_tls: Fix error message; cancel callbacks on error (GH-7403)
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 34cc6252e77cb6..68a1ebe623b871 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -1097,7 +1097,7 @@ async def start_tls(self, transport, protocol, sslcontext, *,
 
         if not getattr(transport, '_start_tls_compatible', False):
             raise TypeError(
-                f'transport {self!r} is not supported by start_tls()')
+                f'transport {transport!r} is not supported by start_tls()')
 
         waiter = self.create_future()
         ssl_protocol = sslproto.SSLProtocol(
@@ -1111,13 +1111,15 @@ async def start_tls(self, transport, protocol, sslcontext, *,
         transport.pause_reading()
 
         transport.set_protocol(ssl_protocol)
-        self.call_soon(ssl_protocol.connection_made, transport)
-        self.call_soon(transport.resume_reading)
+        conmade_cb = self.call_soon(ssl_protocol.connection_made, transport)
+        resume_cb = self.call_soon(transport.resume_reading)
 
         try:
             await waiter
         except Exception:
             transport.close()
+            conmade_cb.cancel()
+            resume_cb.cancel()
             raise
 
         return ssl_protocol._app_transport
diff --git a/Lib/asyncio/sslproto.py b/Lib/asyncio/sslproto.py
index 8515ec5eebd32e..fac2ae74e808b8 100644
--- a/Lib/asyncio/sslproto.py
+++ b/Lib/asyncio/sslproto.py
@@ -399,6 +399,7 @@ def abort(self):
         called with None as its argument.
         """
         self._ssl_protocol._abort()
+        self._closed = True
 
 
 class SSLProtocol(protocols.Protocol):
diff --git a/Misc/NEWS.d/next/Library/2018-06-04-13-46-39.bpo-33769.D_pxYz.rst b/Misc/NEWS.d/next/Library/2018-06-04-13-46-39.bpo-33769.D_pxYz.rst
new file mode 100644
index 00000000000000..9a124fafc6d24f
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-06-04-13-46-39.bpo-33769.D_pxYz.rst
@@ -0,0 +1,2 @@
+asyncio/start_tls: Fix error message; cancel callbacks in case of an
+unhandled error; mark SSLTransport as closed if it is aborted.

In addition to that, mark SSLTransport as "closed" in its "abort()" method to prevent bogus warnings.
(cherry picked from commit 415bc46a78e785f357c8960ae70f18a6b6cccbb6)


Co-authored-by: Yury Selivanov <yury@magic.io>

<!-- issue-number: bpo-33769 -->
https://bugs.python.org/issue33769
<!-- /issue-number -->
