--- old/src/hotspot/share/utilities/ostream.cpp	2020-02-24 07:47:46.197114022 +0000
+++ new/src/hotspot/share/utilities/ostream.cpp	2020-02-24 07:47:45.933112574 +0000
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "jvm.h"
 #include "compiler/compileLog.hpp"
+#include "logging/logAsyncFlusher.hpp"
 #include "memory/allocation.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/arguments.hpp"
@@ -725,6 +726,8 @@
 // called by ostream_abort() after a fatal error.
 //
 void defaultStream::finish_log() {
+  LogAsyncFlusher::cleanup();
+
   xmlStream* xs = _outer_xmlStream;
   xs->done("tty");
 
@@ -939,6 +942,8 @@
 
 // ostream_abort() is called by os::abort() when VM is about to die.
 void ostream_abort() {
+  LogAsyncFlusher::cleanup();
+
   // Here we can't delete tty, just flush its output
   if (tty) tty->flush();