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… lost SSLProtocol.connection_lost() did not notify the application protocol while a handshake was in progress, even when start_tls() had handed over a protocol that had already seen connection_made(). With streams this left StreamWriter.wait_closed() waiting forever.
gpshead
added
needs backport to 3.14
gpshead
marked this pull request as ready for review
October 23, 2026 21:51
gpshead
requested review from
1st1,
asvetlov,
kumaraditya303,
picnixz and
willingc
as code owners
October 23, 2026 21:51
| self.loop.start_tls(tr, proto, client_context), | ||
| 0.5) | ||
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| self.assertIsNone(await on_con_lost) |
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this should have timeout as well, otherwise it will hang forever.
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SSLProtocol.connection_lost()did not forward to the application protocol while the handshake was in progress. That is right forcreate_connection(ssl=...)andcreate_server(ssl=...), where the protocol has not hadconnection_made()yet, but not forstart_tls(), where it has. The method now decides on the application protocol state alone, which already tells the two cases apart (STATE_INITvs.STATE_CON_MADE). After a connection reset, a handshake timeout or a cancelledstart_tls()the protocol now getsconnection_lost(), andStreamWriter.wait_closed()completes instead of waiting forever.A protocol passed to
start_tls()now gets aconnection_lost()call in these cases that it did not get before (withNonewhenstart_tls()was cancelled); that is the documented contract. The reset test accepts anyConnectionErrorbecause it was only run on selector event loops.Fixes #160513
ANT-2026-A6ZIAFVT ANT-2026-4SKWM05E
start_tls()does not callconnection_lost()when the handshake is aborted #160513