Disabling an HS with service-side rend circs in progress may produce ‘Internal Error’ log message
From rend_service_rendezvous_has_opened:
service = rend_service_get_by_pk_digest(
circuit->rend_data->rend_pk_digest);
if (!service) {
log_warn(LD_GENERAL, "Internal error: unrecognized service ID on "
"introduction circuit.");
reason = END_CIRC_REASON_INTERNAL;
goto err;
}When a hidden service is removed from Tor's configuration, rend_config_services closes its introduction circuits, but not its rendezvous circuits. Leaving in-progress rend circs open can trigger this ‘Internal Error’ log message.
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