diff -r d4c57dc7410b src/hotspot/share/prims/jni.cpp
--- a/src/hotspot/share/prims/jni.cpp	Tue Apr 20 07:37:00 2021 +0200
+++ b/src/hotspot/share/prims/jni.cpp	Tue Apr 20 13:07:31 2021 +0200
@@ -916,7 +916,6 @@
 
 
 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
- protected:
   va_list _ap;
 
   inline void get_bool()   {
@@ -953,6 +952,10 @@
     set_ap(rap);
   }
 
+  ~JNI_ArgumentPusherVaArg() {
+    va_end(_ap);
+  }
+
   // Optimized path if we have the bitvector form of signature
   void iterate( uint64_t fingerprint ) {
     if (fingerprint == (uint64_t)CONST64(-1)) {