Merge branch 'filter_call_init_failure' into filter_api

src/core/ext/client_config/subchannel_call_holder.c

@@ -170,7 +170,7 @@ retry:
         &subchannel_call);
     if (error != GRPC_ERROR_NONE) {
       subchannel_call = CANCELLED_CALL;
-      fail_locked(exec_ctx, holder, error);
+      fail_locked(exec_ctx, holder, GRPC_ERROR_REF(error));
       grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error);
     }
     gpr_atm_rel_store(&holder->subchannel_call,

src/core/lib/channel/channel_stack.c

@@ -189,8 +189,13 @@ grpc_error *grpc_call_stack_init(grpc_exec_ctx *exec_ctx,
     call_elems[i].call_data = user_data;
     grpc_error *error =
         call_elems[i].filter->init_call_elem(exec_ctx, &call_elems[i], &args);
-    if (error != GRPC_ERROR_NONE && first_error == GRPC_ERROR_NONE)
+    if (error != GRPC_ERROR_NONE) {
-      first_error = error;
+      if (first_error == GRPC_ERROR_NONE) {
+        first_error = error;
+      } else {
+        GRPC_ERROR_UNREF(error);
+      }
+    }
     user_data +=
         ROUND_UP_TO_ALIGNMENT_SIZE(call_elems[i].filter->sizeof_call_data);
   }

src/core/lib/channel/connected_channel.c

@@ -90,7 +90,7 @@ static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
       exec_ctx, chand->transport, TRANSPORT_STREAM_FROM_CALL_DATA(calld),
       &args->call_stack->refcount, args->server_transport_data);
   return r == 0 ? GRPC_ERROR_NONE
-                : GRPC_ERROR_CREATE("transport initialization failed");
+                : GRPC_ERROR_CREATE("transport stream initialization failed");
 }
 
 static void set_pollset_or_pollset_set(grpc_exec_ctx *exec_ctx,

src/core/lib/surface/call.c

@@ -274,7 +274,7 @@ grpc_call *grpc_call_create(
         grpc_error_get_str(error, GRPC_ERROR_STR_DESCRIPTION);
     close_with_status(&exec_ctx, call, (grpc_status_code)status,
                       error_str == NULL ? "unknown error" : error_str);
-    grpc_error_unref(error);
+    GRPC_ERROR_UNREF(error);
   }
   if (cq != NULL) {
     GPR_ASSERT(

test/core/end2end/tests/filter_call_init_fails.c

@@ -246,8 +246,10 @@ static bool maybe_add_filter(grpc_channel_stack_builder *builder, void *arg) {
     grpc_channel_stack_builder_iterator *it =
         grpc_channel_stack_builder_create_iterator_at_last(builder);
     GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
-    return grpc_channel_stack_builder_add_filter_before(it, &test_filter, NULL,
+    const bool retval = grpc_channel_stack_builder_add_filter_before(
-                                                        NULL);
+        it, &test_filter, NULL, NULL);
+    grpc_channel_stack_builder_iterator_destroy(it);
+    return retval;
   } else {
     return true;
   }