Some fixes

src/core/lib/iomgr/executor.c

@@ -115,6 +115,8 @@ static void maybe_spawn_locked() {
 static void executor_push(grpc_exec_ctx *exec_ctx, grpc_closure *closure,
                           grpc_error *error) {
   gpr_mu_lock(&g_executor.mu);
+  GPR_ASSERT(closure->scheduler == grpc_executor_scheduler);
+  closure->scheduler = grpc_schedule_on_exec_ctx;
   if (g_executor.shutting_down == 0) {
     grpc_closure_list_append(&g_executor.closures, closure, error);
     maybe_spawn_locked();

src/core/lib/iomgr/tcp_client_posix.c

@@ -342,8 +342,8 @@ static void tcp_client_connect_impl(grpc_exec_ctx *exec_ctx,
   addr_str = NULL;
   gpr_mu_init(&ac->mu);
   ac->refs = 2;
-  ac->write_closure.cb = on_writable;
-  ac->write_closure.cb_arg = ac;
+  grpc_closure_init(&ac->write_closure, on_writable, ac,
+                    grpc_schedule_on_exec_ctx);
   ac->channel_args = grpc_channel_args_copy(channel_args);
 
   if (grpc_tcp_trace) {