From 021f6082944496765383c7572157e9be86ed4177 Mon Sep 17 00:00:00 2001
From: Han Kang <hankang@google.com>
Date: Tue, 26 Mar 2019 13:04:10 -0700
Subject: [PATCH] log preshutdowndown registration error if we encounter one

---
 staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go b/staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go
index 450488e13dc..8523788c13c 100644
--- a/staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go
+++ b/staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go
@@ -258,10 +258,13 @@ func (s *GenericAPIServer) PrepareRun() preparedGenericAPIServer {
 
 	// Register audit backend preShutdownHook.
 	if s.AuditBackend != nil {
-		s.AddPreShutdownHook("audit-backend", func() error {
+		err := s.AddPreShutdownHook("audit-backend", func() error {
 			s.AuditBackend.Shutdown()
 			return nil
 		})
+		if err != nil {
+			klog.Errorf("Failed to add pre-shutdown hook for audit-backend %s", err)
+		}
 	}
 
 	return preparedGenericAPIServer{s}