Виртуальные потоки Spring boot -Djdk.tracePinnedThreads=full приводят к зависанию задач ⇐ JAVA

[Гость]

Не уверен, проблема ли это в Spring или Java. Если я запущу тест с приведенной ниже настройкой, включая -Djdk.tracePinnedThreads=full, тест зависнет. Без него работает нормально. Есть идеи, почему это может произойти. Есть ли какая-либо дополнительная конфигурация для Spring, которая мне может понадобиться?
pom.xml

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0

org.springframework.boot
spring-boot-starter-parent
3.2.0


org.test
virtual-spring
0.0.1-SNAPSHOT
VirtualSpring
Virtual Spring Boot

21




org.springframework.boot
spring-boot-starter




org.springframework.boot
spring-boot-starter-test
test






org.springframework.boot
spring-boot-maven-plugin






application.properties
spring.main.keep-alive=true
spring.threads.virtual.enabled=true

класс приложения
package org.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class VirtualSpringApplication {

public static void main(String[] args) {
SpringApplication.run(VirtualSpringApplication.class, args);
}

}

и тестовый класс
package org.test;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class VirtualSpringApplicationTests {

@Test
public void pinned() throws InterruptedException {

final Thread thread0 = Thread.startVirtualThread(() -> testForPin(0));
final Thread thread1 = Thread.startVirtualThread(() -> testForPin(1));
final Thread thread2 = Thread.startVirtualThread(() -> testForPin(2));
System.out.println("THREADS STARTED\n");

thread0.join();
thread1.join();
thread2.join();

}

synchronized public void testForPin(final int i) {

System.out.println("Thread: " + Thread.currentThread().toString() + ", virtual=" + Thread.currentThread().isVirtual() + " i=" + i);
try {
Thread.sleep(1000);
System.out.println("Thread Finished: " + Thread.currentThread().toString() + ", virtual=" + Thread.currentThread().isVirtual() + " i=" + i);
} catch (final InterruptedException e) {
throw new RuntimeException(e);
}
}
}


Обновление 1: jhsdb показывает заблокированные потоки (из-за размера отображаются только соответствующие выходные данные)
jhsdb jstack --pid 16244
Attaching to process ID 16244, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 21.0.2+13-58
Deadlock Detection:

No deadlocks found.

"ForkJoinPool-1-worker-1" #61 daemon prio=5 tid=0x0000025b552abba0 nid=13468 waiting on condition [0x000000e1986fe000]
java.lang.Thread.State: RUNNABLE
JavaThread state: _thread_blocked
- java.lang.VirtualThread$VThreadContinuation.onPinned(jdk.internal.vm.Continuation$Pinned) @bci=23, line=183 (Interpreted frame)
- jdk.internal.vm.Continuation.onPinned0(int) @bci=5, line=393 (Interpreted frame)
- jdk.internal.vm.Continuation.yield0(jdk.internal.vm.ContinuationScope, jdk.internal.vm.Continuation) @bci=325, line=385 (Interpreted frame)
- jdk.internal.vm.Continuation.yield(jdk.internal.vm.ContinuationScope) @bci=69, line=351 (Interpreted frame)
- java.lang.VirtualThread.yieldContinuation() @bci=12, line=431 (Interpreted frame)
- java.lang.VirtualThread.parkNanos(long) @bci=69, line=621 (Interpreted frame)
- java.lang.VirtualThread.sleepNanos(long) @bci=70, line=791 (Interpreted frame)
- java.lang.Thread.sleep(long) @bci=53, line=507 (Interpreted frame)
- org.test.VirtualSpringApplicationTests.testForPin(int) @bci=27, line=27 (Interpreted frame)
- locked (a org.test.VirtualSpringApplicationTests)
- org.test.VirtualSpringApplicationTests.lambda$pinned$0() @bci=2, line=12 (Interpreted frame)
- org.test.VirtualSpringApplicationTests$$Lambda+0x0000025b58449680.run() @bci=4 (Interpreted frame)
- java.lang.Thread.runWith(java.lang.Object, java.lang.Runnable) @bci=5, line=1596 (Interpreted frame)
- java.lang.VirtualThread.run(java.lang.Runnable) @bci=63, line=309 (Interpreted frame)
- java.lang.VirtualThread$VThreadContinuation$1.run() @bci=8, line=190 (Interpreted frame)
- jdk.internal.vm.Continuation.enter0() @bci=4, line=320 (Interpreted frame)
- jdk.internal.vm.Continuation.enter(jdk.internal.vm.Continuation, boolean) @bci=1, line=312 (Interpreted frame)
- jdk.internal.vm.Continuation.enterSpecial(jdk.internal.vm.Continuation, boolean, boolean) @bci=0 (Compiled frame)
- jdk.internal.vm.Continuation.run() @bci=122, line=248 (Interpreted frame)
- java.lang.VirtualThread.runContinuation() @bci=71, line=221 (Interpreted frame)
- java.lang.VirtualThread$$Lambda+0x0000025b5838ac20.run() @bci=4 (Interpreted frame)
- java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec() @bci=4, line=1423 (Interpreted frame)
- java.util.concurrent.ForkJoinTask.doExec() @bci=10, line=387 (Interpreted frame)
- java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.util.concurrent.ForkJoinTask, java.util.concurrent.ForkJoinPool$WorkQueue) @bci=19, line=1312 (Interpreted frame)
- java.util.concurrent.ForkJoinPool.scan(java.util.concurrent.ForkJoinPool$WorkQueue, int, int) @bci=211, line=1843 (Interpreted frame)
- java.util.concurrent.ForkJoinPool.runWorker(java.util.concurrent.ForkJoinPool$WorkQueue) @bci=35, line=1808 (Interpreted frame)
- java.util.concurrent.ForkJoinWorkerThread.run() @bci=31, line=188 (Interpreted frame)

"ForkJoinPool-1-worker-2" #64 daemon prio=5 tid=0x0000025b552ac230 nid=1028 waiting for monitor entry [0x000000e1987fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
JavaThread state: _thread_blocked
- org.test.VirtualSpringApplicationTests.testForPin(int) @bci=0, line=25 (Interpreted frame)
- waiting to lock (a org.test.VirtualSpringApplicationTests)
- org.test.VirtualSpringApplicationTests.lambda$pinned$1() @bci=2, line=13 (Interpreted frame)
- org.test.VirtualSpringApplicationTests$$Lambda+0x0000025b584498a0.run() @bci=4 (Interpreted frame)
- java.lang.Thread.runWith(java.lang.Object, java.lang.Runnable) @bci=5, line=1596 (Interpreted frame)
- java.lang.VirtualThread.run(java.lang.Runnable) @bci=63, line=309 (Interpreted frame)
- java.lang.VirtualThread$VThreadContinuation$1.run() @bci=8, line=190 (Interpreted frame)
- jdk.internal.vm.Continuation.enter0() @bci=4, line=320 (Interpreted frame)
- jdk.internal.vm.Continuation.enter(jdk.internal.vm.Continuation, boolean) @bci=1, line=312 (Interpreted frame)
- jdk.internal.vm.Continuation.enterSpecial(jdk.internal.vm.Continuation, boolean, boolean) @bci=0 (Compiled frame)
- jdk.internal.vm.Continuation.run() @bci=122, line=248 (Interpreted frame)
- java.lang.VirtualThread.runContinuation() @bci=71, line=221 (Interpreted frame)
- java.lang.VirtualThread$$Lambda+0x0000025b5838ac20.run() @bci=4 (Interpreted frame)
- java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec() @bci=4, line=1423 (Interpreted frame)
- java.util.concurrent.ForkJoinTask.doExec() @bci=10, line=387 (Interpreted frame)
- java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.util.concurrent.ForkJoinTask, java.util.concurrent.ForkJoinPool$WorkQueue) @bci=19, line=1312 (Interpreted frame)
- java.util.concurrent.ForkJoinPool.scan(java.util.concurrent.ForkJoinPool$WorkQueue, int, int) @bci=211, line=1843 (Interpreted frame)
- java.util.concurrent.ForkJoinPool.runWorker(java.util.concurrent.ForkJoinPool$WorkQueue) @bci=35, line=1808 (Interpreted frame)
- java.util.concurrent.ForkJoinWorkerThread.run() @bci=31, line=188 (Interpreted frame)

"ForkJoinPool-1-worker-3" #65 daemon prio=5 tid=0x0000025b552acf50 nid=11824 waiting for monitor entry [0x000000e1988fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
JavaThread state: _thread_blocked
- org.test.VirtualSpringApplicationTests.testForPin(int) @bci=0, line=25 (Interpreted frame)
- waiting to lock (a org.test.VirtualSpringApplicationTests)
- org.test.VirtualSpringApplicationTests.lambda$pinned$2() @bci=2, line=14 (Interpreted frame)
- org.test.VirtualSpringApplicationTests$$Lambda+0x0000025b58449ac0.run() @bci=4 (Interpreted frame)
- java.lang.Thread.runWith(java.lang.Object, java.lang.Runnable) @bci=5, line=1596 (Interpreted frame)
- java.lang.VirtualThread.run(java.lang.Runnable) @bci=63, line=309 (Interpreted frame)
- java.lang.VirtualThread$VThreadContinuation$1.run() @bci=8, line=190 (Interpreted frame)
- jdk.internal.vm.Continuation.enter0() @bci=4, line=320 (Interpreted frame)
- jdk.internal.vm.Continuation.enter(jdk.internal.vm.Continuation, boolean) @bci=1, line=312 (Interpreted frame)
- jdk.internal.vm.Continuation.enterSpecial(jdk.internal.vm.Continuation, boolean, boolean) @bci=0 (Compiled frame)
- jdk.internal.vm.Continuation.run() @bci=122, line=248 (Interpreted frame)
- java.lang.VirtualThread.runContinuation() @bci=71, line=221 (Interpreted frame)
- java.lang.VirtualThread$$Lambda+0x0000025b5838ac20.run() @bci=4 (Interpreted frame)
- java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec() @bci=4, line=1423 (Interpreted frame)
- java.util.concurrent.ForkJoinTask.doExec() @bci=10, line=387 (Interpreted frame)
- java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.util.concurrent.ForkJoinTask, java.util.concurrent.ForkJoinPool$WorkQueue) @bci=19, line=1312 (Interpreted frame)
- java.util.concurrent.ForkJoinPool.scan(java.util.concurrent.ForkJoinPool$WorkQueue, int, int) @bci=211, line=1843 (Interpreted frame)
- java.util.concurrent.ForkJoinPool.runWorker(java.util.concurrent.ForkJoinPool$WorkQueue) @bci=35, line=1808 (Interpreted frame)
- java.util.concurrent.ForkJoinWorkerThread.run() @bci=31, line=188 (Interpreted frame)


Подробнее здесь: https://stackoverflow.com/questions/777 ... ks-to-hang