--- jdk11/src/hotspot/cpu/zero/cppInterpreter_zero.cpp	2021-01-19 09:53:51.448158984 +0100
+++ jdk11/src/hotspot/cpu/zero/cppInterpreter_zero.cpp	2021-01-19 09:59:03.485978413 +0100
@@ -102,8 +102,8 @@
       return result;
     default:
       ShouldNotReachHere();
-      return result; // silence compiler warnings
   }
+  return result;
 }
 
 
--- jdk11/src/hotspot/os_cpu/bsd_zero/os_bsd_zero.cpp	2021-01-19 09:53:51.452159007 +0100
+++ jdk11/src/hotspot/os_cpu/bsd_zero/os_bsd_zero.cpp	2021-01-19 09:55:04.060582394 +0100
@@ -196,6 +196,7 @@
     else*/ if (thread->thread_state() == _thread_in_vm &&
                sig == SIGBUS && thread->doing_unsafe_access()) {
       ShouldNotCallThis();
+    return 0;
     }
 
     // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC
--- jdk11/src/hotspot/os_cpu/linux_zero/os_linux_zero.cpp	2021-01-19 09:53:51.456159031 +0100
+++ jdk11/src/hotspot/os_cpu/linux_zero/os_linux_zero.cpp	2021-01-19 09:55:04.060582394 +0100
@@ -210,6 +210,7 @@
     else*/ if (thread->thread_state() == _thread_in_vm &&
                sig == SIGBUS && thread->doing_unsafe_access()) {
       ShouldNotCallThis();
+    return 0;
     }
 
     // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC