Circuit in CIRCUIT_PURPOSE_C_INTRODUCING with no rend_data
With a somewhat recent Git master (commit 2725a88d5e3ec362a4f866f53c26ca20f943eb49):
Oct 09 19:13:41.000 [info] circuit_expire_building(): Abandoning circ [redacted] (state 3:open, purpose 6)
Oct 09 19:13:41.000 [info] internal (high-uptime) circ (length 4): [redacted](open) [redacted](open) [redacted](open) [redacted](open)
Oct 09 19:13:41.000 [err] _circuit_mark_for_close(): Bug: circuitlist.c:1222: _circuit_mark_for_close: Assertion ocirc->rend_data failed; aborting.
(CIRCUIT_PURPOSE_C_INTRODUCING == 6
)
The assertion occurred in the following chunk of code, added to help fix legacy/trac#3825 (moved):
} else if (circ->purpose == CIRCUIT_PURPOSE_C_INTRODUCING &&
reason != END_STREAM_REASON_TIMEOUT) {
origin_circuit_t *ocirc = TO_ORIGIN_CIRCUIT(circ);
tor_assert(ocirc->build_state->chosen_exit);
tor_assert(ocirc->rend_data);
log_info(LD_REND, "Failed intro circ %s to %s "
"(building circuit to intro point). "
"Marking intro point as possibly unreachable.",
safe_str_client(ocirc->rend_data->onion_address),
safe_str_client(build_state_get_exit_nickname(ocirc->build_state)));
rend_client_report_intro_point_failure(ocirc->build_state->chosen_exit,
ocirc->rend_data,
INTRO_POINT_FAILURE_UNREACHABLE);
But we should never have a circuit with that purpose with its rend_data
field unset.