--- /dev/null	2016-10-24 21:41:30.000000000 +0300
+++ new/test/javax/sound/sampled/Mixers/DisabledAssertionCrash.java	2016-10-24 21:41:30.000000000 +0300
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.DataLine;
+import javax.sound.sampled.Line;
+import javax.sound.sampled.LineUnavailableException;
+import javax.sound.sampled.SourceDataLine;
+import javax.sound.sampled.TargetDataLine;
+
+/**
+ * @test
+ * @bug 4991672
+ * @summary disabled assertion at maximum thread priority causes audio crash
+ * @run main/timeout=600 DisabledAssertionCrash
+ */
+public class DisabledAssertionCrash {
+    private static final int bufferSize = 1024;
+
+    public static void main(String[] args) {
+
+        System.out.println("This program hangs if priority is set,");
+        System.out.println("and assertion is in the code.");
+        System.out.println("The program crashes the entire Windows system");
+        System.out.println("if assertions are disabled.");
+        try {
+            Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
+            AudioFormat audioFormat = new AudioFormat(44100,16,1,true,true);
+            Line.Info sourceDataLineInfo = new DataLine.Info(SourceDataLine.class,audioFormat);
+            SourceDataLine sourceDataLine =
+            (SourceDataLine) AudioSystem.getLine(sourceDataLineInfo);
+            System.out.println("SourceDataLine: "+sourceDataLine);
+            sourceDataLine.open(audioFormat, bufferSize);
+            sourceDataLine.start();
+            Line.Info targetDataLineInfo =
+            new DataLine.Info(TargetDataLine.class,audioFormat);
+            TargetDataLine targetDataLine =
+            (TargetDataLine) AudioSystem.getLine(targetDataLineInfo);
+            System.out.println("TargetDataLine: "+targetDataLine);
+            targetDataLine.open(audioFormat, bufferSize);
+            targetDataLine.start();
+            byte[] data = new byte[bufferSize];
+
+            // execute for 20 seconds
+            float bufferTime = (((float) data.length) / audioFormat.getFrameSize()) / audioFormat.getFrameRate();
+            int count = (int) (20.0f / bufferTime);
+            System.out.println("Buffer time: "+(bufferTime * 1000)+" millis. "+count+" iterations.");
+            for (int i = 0; i < count; i++) {
+                int cnt = targetDataLine.read(data,0,data.length);
+                sourceDataLine.write(data,0,cnt);
+                assert cnt == data.length;
+            }
+            System.out.println("Successfully recorded/played "+count+" buffers. Passed");
+        } catch(LineUnavailableException lue) {
+            System.out.println("Audio hardware is not available!");
+            lue.printStackTrace();
+            System.out.println("Cannot execute test. NOT failed.");
+        } catch(IllegalArgumentException iae) {
+            System.out.println("No audio hardware is installed!");
+            iae.printStackTrace();
+            System.out.println("Test system not correctly setup.");
+            System.out.println("Cannot execute test. NOT failed.");
+        } catch(Exception e) {
+            System.out.println("Unexpected Exception: "+e);
+            e.printStackTrace();
+            System.out.println("Cannot execute test. NOT failed.");
+        }
+    }
+}