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/logging/LoggingDeadlock.java
+++ b/test/jdk/java/util/logging/LoggingDeadlock.java
@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2006, 2020, 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     4994705
+ *
+ * @summary deadlock in LogManager
+ * @author  Serguei Spitsyn / SAP
+ *
+ * @library  /test/lib
+ * @build    LoggingDeadlock
+ * @run  main/timeout=15 LoggingDeadlock
+ * @key randomness
+ */
+
+/*
+ *
+ * There can be a deadlock between two class initializations.
+ * It happens if the LogManager.<clinit> and the Logger.<clinit>
+ * are invoked concurrently on two different threads.
+ * There is a cyclic dependence between the two static initializers:
+ *   1. LogManager.<clinit> instantiate the class RootLogger which
+ *      is a subclass of the Logger class.
+ *      It requires the Logger class initialization to complete.
+ *   2. Logger.<clinit> initializes the field "global", so it
+ *      it makes a call: Logger.getLogger("global").
+ *      Subsequently the LogManager static method getLogManager()
+ *      is called which requires the LogManager class
+ *      initialization to complete.
+ * This cyclic dependence causes a deadlock, so two class
+ * initializations are waiting for each other.
+ * This is a regression test for this bug.
+ */
+
+
+import java.util.Random;
+import java.util.logging.LogManager;
+import java.util.logging.Logger;
+import jdk.test.lib.RandomFactory;
+
+public class LoggingDeadlock {
+
+    private static int preventLoopElision;
+    private static final Random random = RandomFactory.getRandom();
+
+    public static void randomDelay() {
+        int runs = random.nextInt(1000000);
+        int c = 0;
+
+        for (int i = 0; i < runs; ++i) {
+            c = c + i;
+        }
+        preventLoopElision = c;
+    }
+
+    public static void main(String[] args) throws InterruptedException{
+        Thread t1 = new Thread(new Runnable() {
+            public void run() {
+                randomDelay();
+                // Trigger Logger.<clinit>
+                Logger.getAnonymousLogger();
+            }
+        });
+
+        Thread t2 = new Thread(new Runnable() {
+            public void run() {
+                randomDelay();
+                // Trigger LogManager.<clinit>
+                LogManager.getLogManager();
+            }
+        });
+
+        t1.start();
+        t2.start();
+
+        t1.join();
+        t2.join();
+        System.out.println("\nTest passed");
+    }
+}