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

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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.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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test/hotspot/jtreg/runtime/Monitor/ConcurrentDeflation.java Normal file
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/*
* Copyright (c) 2023, 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.
*/
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
import jdk.test.whitebox.WhiteBox;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
/*
* @test
* @bug 8318757
* @summary Test concurrent monitor deflation by MonitorDeflationThread and thread dumping
* @library /test/lib
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:GuaranteedAsyncDeflationInterval=2000 -XX:+WhiteBoxAPI ConcurrentDeflation
*/
public class ConcurrentDeflation {
static final WhiteBox WB = WhiteBox.getWhiteBox();
public static final long TOTAL_RUN_TIME_NS = 10_000_000_000L;
public static Object[] monitors = new Object[1000];
public static int monitorCount;
public static void main(String[] args) throws Exception {
Thread threadDumper = new Thread(() -> dumpThreads());
threadDumper.start();
Thread monitorCreator = new Thread(() -> createMonitors());
monitorCreator.start();
threadDumper.join();
monitorCreator.join();
}
static private void dumpThreads() {
ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
int dumpCount = 0;
long startTime = System.nanoTime();
while (System.nanoTime() - startTime < TOTAL_RUN_TIME_NS) {
threadBean.dumpAllThreads(true, false);
dumpCount++;
try {
Thread.sleep(10);
} catch (InterruptedException e) {}
}
System.out.println("Dumped all thread info " + dumpCount + " times");
}
static private void createMonitors() {
int index = 0;
long startTime = System.nanoTime();
while (System.nanoTime() - startTime < TOTAL_RUN_TIME_NS) {
index = index++ % 1000;
monitors[index] = new Object();
synchronized (monitors[index]) {
try {
// Force inflation
monitors[index].wait(1);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
monitorCount++;
}
}
System.out.println("Created " + monitorCount + " monitors");
}
}