undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/jdk/java/util/Timer/AutoStop.java
+++ b/test/jdk/java/util/Timer/AutoStop.java
@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2021, 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.
+ */
+
+/*
+ * @test
+ * @bug 8263903
+ * @requires vm.gc != "Epsilon"
+ * @summary Discarding a Timer causes the Timer thread to stop.
+ */
+
+import java.util.Timer;
+import java.util.TimerTask;
+import java.lang.ref.Reference;
+
+public class AutoStop {
+    static final Object wakeup = new Object();
+    static Thread tdThread = null;
+    static volatile int counter = 0;
+    static final int COUNTER_LIMIT = 10;
+
+    public static void main(String[] args) throws Exception {
+        Timer t = new Timer();
+
+        // Run an event that records the timer thread.
+        t.schedule(new TimerTask() {
+                public void run() {
+                    synchronized(wakeup) {
+                        tdThread = Thread.currentThread();
+                        wakeup.notify();
+                    }
+                }
+            }, 0);
+
+        // Wait for the thread to be accessible.
+        try {
+            synchronized(wakeup) {
+                while (tdThread == null) {
+                    wakeup.wait();
+                }
+            }
+        } catch (InterruptedException e) {
+        }
+
+        // Schedule some events that increment the counter.
+        for (int i = 0; i < COUNTER_LIMIT; ++i) {
+            t.schedule(new TimerTask() {
+                    public void run() {
+                        ++counter;
+                    }
+                }, 100);
+        }
+
+        // Ensure the timer is accessible at least until here.
+        Reference.reachabilityFence(t);
+        t = null;               // Remove the reference to the timer.
+        System.gc();            // Run GC to trigger cleanup.
+        tdThread.join();        // Wait for thread to stop.
+        int finalCounter = counter;
+        if (finalCounter != COUNTER_LIMIT) {
+            throw new RuntimeException("Unrun events: counter = " + finalCounter);
+        }
+    }
+}
+