diff -r 13588c901957 -r 9cf78a70fa4f src/hotspot/share/runtime/vmOperations.cpp
--- a/src/hotspot/share/runtime/vmOperations.cpp	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/hotspot/share/runtime/vmOperations.cpp	Thu Oct 17 20:53:35 2019 +0100
@@ -51,13 +51,10 @@
 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
   { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
 
-void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
+void VM_Operation::set_calling_thread(Thread* thread) {
   _calling_thread = thread;
-  assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
-  _priority = priority;
 }
 
-
 void VM_Operation::evaluate() {
   ResourceMark rm;
   LogTarget(Debug, vmoperation) lt;
@@ -510,7 +507,7 @@
       Thread::current_or_null() != _shutdown_thread) {
     // _vm_exited is set at safepoint, and the Threads_lock is never released
     // we will block here until the process dies
-    Threads_lock->lock_without_safepoint_check();
+    Threads_lock->lock();
     ShouldNotReachHere();
   }
 }