Merge pull request #22957 from yang-g/client_fuzzer

Add a missing ref and fuzzer test case

src/core/ext/filters/message_size/message_size_filter.cc

@@ -187,12 +187,8 @@ static void recv_message_ready(void* user_data, grpc_error* error) {
     grpc_error* new_error = grpc_error_set_int(
         GRPC_ERROR_CREATE_FROM_COPIED_STRING(message_string),
         GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_RESOURCE_EXHAUSTED);
+    error = grpc_error_add_child(GRPC_ERROR_REF(error), new_error);
     GRPC_ERROR_UNREF(calld->error);
-    if (error == GRPC_ERROR_NONE) {
-      error = new_error;
-    } else {
-      error = grpc_error_add_child(error, new_error);
-    }
     calld->error = GRPC_ERROR_REF(error);
     gpr_free(message_string);
   } else {

tools/run_tests/generated/tests.json

@@ -26494,6 +26494,29 @@
     ], 
     "uses_polling": false
   }, 
+  {
+    "args": [
+      "test/core/end2end/fuzzers/client_fuzzer_corpus/error_refcount"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "client_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
   {
     "args": [
       "test/core/end2end/fuzzers/client_fuzzer_corpus/f03120d1a8376638e071735bf4746454b6ede389"