--- a/hotspot/src/share/vm/runtime/thread.cpp	Fri Apr 01 07:08:55 2016 +0200
+++ b/hotspot/src/share/vm/runtime/thread.cpp	Fri Apr 01 13:51:29 2016 +0530
@@ -153,7 +153,6 @@
 // Current thread is maintained as a thread-local variable
 THREAD_LOCAL_DECL Thread* Thread::_thr_current = NULL;
 #endif
-
 // Class hierarchy
 // - Thread
 //   - VMThread
@@ -2888,7 +2887,9 @@
 
 // Called by Threads::print() for VM_PrintThreads operation
 void JavaThread::print_on(outputStream *st) const {
-  st->print("\"%s\" ", get_thread_name());
+  st->print_raw("\"");
+  st->print_raw(get_thread_name());
+  st->print_raw("\" ");
   oop thread_oop = threadObj();
   if (thread_oop != NULL) {
     st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop));

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/serviceability/tmtools/jstack/JstackThreadTest.java	Fri Apr 01 13:51:29 2016 +0530
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 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 java.util.Arrays;
+import jdk.test.lib.JDKToolLauncher;
+import jdk.test.lib.OutputAnalyzer;
+import jdk.test.lib.ProcessTools;
+
+/*
+ * @test JstackThreadTest
+ * @bug 8151442
+ * @summary jstack doesn't close quotation marks properly with threads' name greater than 1996 characters
+ * @library /testlibrary
+ * @build jdk.test.lib.*
+ * @run main JstackThreadTest
+ */
+public class JstackThreadTest {
+  static class NamedThread extends Thread {
+    NamedThread(String name) {
+      setName(name);
+    }
+    @Override
+    public void run() {
+      try {
+            Thread.sleep(2000);
+          } catch(Exception e){
+            e.printStackTrace();
+          }
+        }
+    }
+
+  public static void main(String[] args) throws Exception {
+    StringBuilder sb = new StringBuilder();
+     /*create a string more than 1996 character */
+    for(int i = 0; i < 1998; i++){
+      sb.append("a");
+    }
+    testWithName(sb.toString());
+  }
+
+  private static void testWithName(String name) throws Exception {
+    // Start a thread with a long thread name
+    NamedThread thread = new NamedThread(name);
+    thread.start();
+    ProcessBuilder processBuilder = new ProcessBuilder();
+    JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jstack");
+    launcher.addToolArg("-l");
+    launcher.addToolArg(Long.toString(ProcessTools.getProcessId()));
+    processBuilder.command(launcher.getCommand());
+    System.out.println(Arrays.toString(processBuilder.command().toArray()).replace(",", ""));
+    OutputAnalyzer output = ProcessTools.executeProcess(processBuilder);
+    System.out.println(output.getOutput());
+    output.shouldContain("\""+ name + "\"");
+  }
+}