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.

test/jdk/java/lang/ref/OOMEInReferenceHandler.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2013, 2025, 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 7038914 8016341
+ * @summary Verify that the reference handler does not die after an OOME allocating the InterruptedException object
+ * @requires test.thread.factory == null
+ * @run main/othervm -XX:-UseGCOverheadLimit -Xmx24M -XX:-UseTLAB OOMEInReferenceHandler
+ * @author peter.levart@gmail.com
+ * @key intermittent
+ */
+
+import java.lang.ref.*;
+
+public class OOMEInReferenceHandler {
+     static Object[] fillHeap() {
+         Object[] first = null, last = null;
+         int size = 1 << 20;
+         while (size > 0) {
+             try {
+                 Object[] array = new Object[size];
+                 if (first == null) {
+                     first = array;
+                 } else {
+                     last[0] = array;
+                 }
+                 last = array;
+             } catch (OutOfMemoryError oome) {
+                 size = size >>> 1;
+             }
+         }
+         return first;
+     }
+
+     public static void main(String[] args) throws Exception {
+         // preinitialize the InterruptedException class so that the reference handler
+         // does not die due to OOME when loading the class if it is the first use
+         InterruptedException ie = new InterruptedException("dummy");
+
+         ThreadGroup tg = Thread.currentThread().getThreadGroup();
+         for (
+             ThreadGroup tgn = tg;
+             tgn != null;
+             tg = tgn, tgn = tg.getParent()
+             )
+             ;
+
+         Thread[] threads = new Thread[tg.activeCount()];
+         Thread referenceHandlerThread = null;
+         int n = tg.enumerate(threads);
+         for (int i = 0; i < n; i++) {
+             if ("Reference Handler".equals(threads[i].getName())) {
+                 referenceHandlerThread = threads[i];
+             }
+         }
+
+         if (referenceHandlerThread == null) {
+             throw new IllegalStateException("Couldn't find Reference Handler thread.");
+         }
+
+         ReferenceQueue<Object> refQueue = new ReferenceQueue<>();
+         Object referent = new Object();
+         WeakReference<Object> weakRef = new WeakReference<>(referent, refQueue);
+
+         // Allow thread.sleep() to pre-allocate ThreadSleepEvent object
+         Thread.sleep(1L);
+         Object waste = fillHeap();
+
+         referenceHandlerThread.interrupt();
+
+         // allow referenceHandlerThread some time to throw OOME
+         Thread.sleep(500L);
+
+         // release waste & referent
+         waste = null;
+         referent = null;
+
+         // wait at most 10 seconds for success or failure
+         for (int i = 0; i < 20; i++) {
+             if (refQueue.poll() != null) {
+                 // Reference Handler thread still working -> success
+                 return;
+             }
+             System.gc();
+             Thread.sleep(500L); // wait a little to allow GC to do it's work before allocating objects
+             if (!referenceHandlerThread.isAlive()) {
+                 // Reference Handler thread died -> failure
+                 throw new Exception("Reference Handler thread died.");
+             }
+         }
+
+         // no sure answer after 10 seconds
+         throw new IllegalStateException("Reference Handler thread stuck. weakRef.get(): " + weakRef.get());
+     }
+}