Merge pull request #23696 from veblush/msan-workaround

Add MSAN workaround to TestEnvironment

test/core/util/test_config.cc

@@ -413,6 +413,15 @@ TestEnvironment::~TestEnvironment() {
       break;
     }
   }
+  if (BuiltUnderMsan()) {
+    // This is a workaround for MSAN. MSAN doesn't like having shutdown thread
+    // running. Although the code above waits until shutdown is done, chances
+    // are that thread itself is still alive. To workaround this problem, this
+    // is going to wait for 0.5 sec to give a chance to the shutdown thread to
+    // exit. https://github.com/grpc/grpc/issues/23695
+    gpr_sleep_until(gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
+                                 gpr_time_from_millis(500, GPR_TIMESPAN)));
+  }
   gpr_log(GPR_INFO, "TestEnvironment ends");
 }