--- old/src/hotspot/share/jfr/recorder/repository/jfrEmergencyDump.cpp	2019-11-21 11:58:01.823852983 +0100
+++ new/src/hotspot/share/jfr/recorder/repository/jfrEmergencyDump.cpp	2019-11-21 11:58:01.331844674 +0100
@@ -418,7 +418,7 @@
 static volatile int jfr_shutdown_lock = 0;
 
 static bool guard_reentrancy() {
-  return Atomic::cmpxchg(1, &jfr_shutdown_lock, 0) == 0;
+  return Atomic::cmpxchg(&jfr_shutdown_lock, 0, 1) == 0;
 }
 
 class JavaThreadInVM : public StackObj {