[experiment] Disable work_serializer_dispatch (#37195)

Causes crashes during shutdown.

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Closes #37195

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37195 from yousukseung:work-serializer-dispatch-disable 781bc59384
PiperOrigin-RevId: 650741850

bazel/experiments.bzl

@@ -135,6 +135,10 @@ EXPERIMENTS = {
         "off": {
             "core_end2end_test": [
                 "event_engine_client",
+                "work_serializer_dispatch",
+            ],
+            "cpp_end2end_test": [
+                "work_serializer_dispatch",
             ],
             "endpoint_test": [
                 "tcp_frame_size_tuning",
@@ -150,10 +154,16 @@ EXPERIMENTS = {
                 "tcp_frame_size_tuning",
                 "tcp_rcv_lowat",
             ],
+            "lb_unit_test": [
+                "work_serializer_dispatch",
+            ],
             "resource_quota_test": [
                 "free_large_allocator",
                 "unconstrained_max_quota_buffer_size",
             ],
+            "xds_end2end_test": [
+                "work_serializer_dispatch",
+            ],
         },
         "on": {
             "cancel_ares_query_test": [
@@ -161,10 +171,6 @@ EXPERIMENTS = {
             ],
             "core_end2end_test": [
                 "event_engine_listener",
-                "work_serializer_dispatch",
-            ],
-            "cpp_end2end_test": [
-                "work_serializer_dispatch",
             ],
             "cpp_lb_end2end_test": [
                 "pick_first_new",
@@ -174,14 +180,12 @@ EXPERIMENTS = {
             ],
             "lb_unit_test": [
                 "pick_first_new",
-                "work_serializer_dispatch",
             ],
             "resolver_component_tests_runner_invoker": [
                 "event_engine_dns",
             ],
             "xds_end2end_test": [
                 "pick_first_new",
-                "work_serializer_dispatch",
             ],
         },
     },

src/core/lib/experiments/experiments.cc

@@ -465,7 +465,7 @@ const ExperimentMetadata g_experiment_metadata[] = {
      additional_constraints_work_serializer_clears_time_cache, nullptr, 0, true,
      true},
     {"work_serializer_dispatch", description_work_serializer_dispatch,
-     additional_constraints_work_serializer_dispatch, nullptr, 0, true, true},
+     additional_constraints_work_serializer_dispatch, nullptr, 0, false, true},
 };
 
 }  // namespace grpc_core

src/core/lib/experiments/experiments.h

@@ -152,8 +152,7 @@ inline bool IsTraceRecordCallopsEnabled() { return true; }
 inline bool IsUnconstrainedMaxQuotaBufferSizeEnabled() { return false; }
 #define GRPC_EXPERIMENT_IS_INCLUDED_WORK_SERIALIZER_CLEARS_TIME_CACHE
 inline bool IsWorkSerializerClearsTimeCacheEnabled() { return true; }
-#define GRPC_EXPERIMENT_IS_INCLUDED_WORK_SERIALIZER_DISPATCH
-inline bool IsWorkSerializerDispatchEnabled() { return true; }
+inline bool IsWorkSerializerDispatchEnabled() { return false; }
 #endif
 
 #else

src/core/lib/experiments/rollouts.yaml

@@ -110,6 +110,6 @@
   default:
     # TODO(ysseung): Not fully tested.
     ios: broken
-    posix: true
+    posix: false
     # TODO(ysseung): Test flakes not fully resolved.
     windows: broken