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Hi Nick, as discussed this morning tor had a regression between commits fd994f5-b8a2bdb. Tor crashes when Stem attempts to connect with its ORPort then disconnect. Here's its stacktrace...

Sep 05 20:36:47.000 [err] tor_assertion_failed_(): Bug: src/core/mainloop/connection.c:5109: assert_connection_ok: Assertion or_conn->tls failed; aborting. (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug: Assertion or_conn->tls failed in assert_connection_ok at src/core/mainloop/connection.c:5109. Stack trace: (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(log_backtrace_impl+0x47) [0x55fcc4c95447] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(tor_assertion_failed_+0x94) [0x55fcc4c90bb4] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(assert_connection_ok+0x575) [0x55fcc4c240a5] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(connection_mark_for_close_internal_+0x27) [0x55fcc4c246b7] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(connection_handle_read+0x517) [0x55fcc4c28bb7] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(+0x5470e) [0x55fcc4b0470e] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5(event_base_loop+0x819) [0x7fb789e174c9] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(do_main_loop+0x1fa) [0x55fcc4b069aa] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(tor_run_main+0x11d5) [0x55fcc4b09065] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(tor_main+0x3a) [0x55fcc4b012fa] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(main+0x19) [0x55fcc4b00e79] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7fb789196830] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Sep 05 20:36:47.000 [err] Bug:     tor(_start+0x29) [0x55fcc4b00ec9] (on Tor 0.3.5.0-alpha-dev b8a2bdbdc8c46776)
Aborted (core dumped)

Unfortunately since this is with the ORPort rather than the ControlPort I can't provide a simple telnet demo. If you need repro steps just let me know and I can come up with a demo.