--- a/src/hotspot/os_cpu/linux_aarch64/os_linux_aarch64.cpp	Fri Dec 21 17:14:46 2018 +0000
+++ b/src/hotspot/os_cpu/linux_aarch64/os_linux_aarch64.cpp	Fri Dec 21 18:26:55 2018 +0000
@@ -370,7 +370,6 @@
       if (thread->on_local_stack(addr)) {
         // stack overflow
         if (thread->in_stack_yellow_reserved_zone(addr)) {
-          thread->disable_stack_yellow_reserved_zone();
           if (thread->thread_state() == _thread_in_Java) {
             if (thread->in_stack_reserved_zone(addr)) {
               frame fr;
@@ -392,9 +391,11 @@
             }
             // Throw a stack overflow exception.  Guard pages will be reenabled
             // while unwinding the stack.
+            thread->disable_stack_yellow_reserved_zone();
             stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
           } else {
             // Thread was in the vm or native code.  Return and try to finish.
+            thread->disable_stack_yellow_reserved_zone();
             return 1;
           }
         } else if (thread->in_stack_red_zone(addr)) {

--- a/src/hotspot/share/runtime/thread.cpp	Fri Dec 21 17:14:46 2018 +0000
+++ b/src/hotspot/share/runtime/thread.cpp	Fri Dec 21 18:26:55 2018 +0000
@@ -2603,8 +2603,7 @@
 }
 
 void JavaThread::enable_stack_reserved_zone() {
-  assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
-  assert(_stack_guard_state != stack_guard_enabled, "already enabled");
+  assert(_stack_guard_state == stack_guard_reserved_disabled, "inconsistent state");
 
   // The base notation is from the stack's point of view, growing downward.
   // We need to adjust it to work correctly with guard_memory()
@@ -2622,11 +2621,10 @@
 }
 
 void JavaThread::disable_stack_reserved_zone() {
-  assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
-  assert(_stack_guard_state != stack_guard_reserved_disabled, "already disabled");
+  assert(_stack_guard_state == stack_guard_enabled, "inconsistent state");
 
   // Simply return if called for a thread that does not use guard pages.
-  if (_stack_guard_state == stack_guard_unused) return;
+  if (_stack_guard_state != stack_guard_enabled) return;
 
   // The base notation is from the stack's point of view, growing downward.
   // We need to adjust it to work correctly with guard_memory()