Merge remote-tracking branch 'tor-github/pr/1077' into maint-0.3.5

changes/bug29034

+  o Major bugfixes (Onion service reachability):
+    - Properly clean up the introduction point map when circuits change purpose
+      from onion service circuits to pathbias, measurement, or other circuit types.
+      This should fix some service-side instances of introduction point failure.
+      Fixes bug 29034; bugfix on 0.3.2.1-alpha.

src/core/or/circuituse.c

@@ -3066,6 +3066,12 @@ circuit_change_purpose(circuit_t *circ, uint8_t new_purpose)
               circ->purpose,
               circuit_purpose_to_string(new_purpose),
               new_purpose);
+
+    /* Take specific actions if we are repurposing a hidden service circuit. */
+    if (circuit_purpose_is_hidden_service(circ->purpose) &&
+        !circuit_purpose_is_hidden_service(new_purpose)) {
+      hs_circ_cleanup(circ);
+    }
   }
 
   old_purpose = circ->purpose;