无死锁的Java线程挂起

我目前在挂起的进程中遇到一些问题

首先，下面的线程转储显示没有死锁。另一件有趣的事情是，这个过程挂在

java.lang.System.identityHashCode

方法上。当前该进程的CPU使用率为0%，有时峰值为1%。。。通常该过程使用100%。它使用1.7GB的RAM（这在这个过程中是正常的）。这台机器有大量可用的CPU、磁盘空间和RAM

Attaching to process ID 4146, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 23.7-b01
Deadlock Detection:

No deadlocks found.

Thread 12761: (state = BLOCKED)


Thread 4159: (state = BLOCKED)


Thread 4158: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Interpreted frame)
 - java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=135 (Interpreted frame)
 - java.lang.ref.ReferenceQueue.remove() @bci=2, line=151 (Interpreted frame)
 - java.lang.ref.Finalizer$FinalizerThread.run() @bci=3, line=177 (Interpreted frame)


Thread 4157: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Interpreted frame)
 - java.lang.Object.wait() @bci=2, line=503 (Interpreted frame)
 - java.lang.ref.Reference$ReferenceHandler.run() @bci=46, line=133 (Interpreted frame)


Thread 4147: (state = IN_VM)
 - java.lang.System.identityHashCode(java.lang.Object) @bci=0 (Compiled frame; information may be imprecise)
 - java.util.IdentityHashMap.hash(java.lang.Object, int) @bci=1, line=301 (Compiled frame)
 - java.util.IdentityHashMap.containsKey(java.lang.Object) @bci=17, line=358 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=18, line=346 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.FastClonerArrayList.clone(java.lang.Object, com.rits.cloning.Cloner, java.util.Map) @bci=47, line=23 (Compiled frame)
 - com.rits.cloning.Cloner.fastClone(java.lang.Object, java.util.Map) @bci=30, line=96 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=100, line=355 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.FastClonerArrayList.clone(java.lang.Object, com.rits.cloning.Cloner, java.util.Map) @bci=47, line=23 (Compiled frame)
 - com.rits.cloning.Cloner.fastClone(java.lang.Object, java.util.Map) @bci=30, line=96 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=100, line=355 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.FastClonerArrayList.clone(java.lang.Object, com.rits.cloning.Cloner, java.util.Map) @bci=47, line=23 (Compiled frame)
 - com.rits.cloning.Cloner.fastClone(java.lang.Object, java.util.Map) @bci=30, line=96 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=100, line=355 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.FastClonerArrayList.clone(java.lang.Object, com.rits.cloning.Cloner, java.util.Map) @bci=47, line=23 (Compiled frame)
 - com.rits.cloning.Cloner.fastClone(java.lang.Object, java.util.Map) @bci=30, line=96 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=100, line=355 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.FastClonerArrayList.clone(java.lang.Object, com.rits.cloning.Cloner, java.util.Map) @bci=47, line=23 (Compiled frame)
 - com.rits.cloning.Cloner.fastClone(java.lang.Object, java.util.Map) @bci=30, line=96 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=100, line=355 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.cloneInternal(java.lang.Object, java.util.Map) @bci=368, line=404 (Compiled frame)
 - com.rits.cloning.Cloner.deepClone(java.lang.Object) @bci=61, line=309 (Compiled frame)
 - arquitetura.representation.Architecture.deepClone() @bci=23, line=497 (Compiled frame)
 - jmetal.operators.mutation.PLAFeatureMutation.execute(java.lang.Object) @bci=109, line=862 (Compiled frame)
 - jmetal.metaheuristics.nsgaII.NSGAII.execute() @bci=321, line=129 (Compiled frame)
 - br.ufpr.inf.opla.patterns.main.NSGAII_OPLA.main(java.lang.String[]) @bci=1116, line=179 (Interpreted frame)

我用不同的参数执行相同的过程已经有一段时间了（一个多星期）。我使用的是进化算法，所以对于我的问题来说，耗时是正常的。我执行了120次相同的进程（使用不同的参数），这是第一个挂起的。目前有4个进程同时运行（包括挂起的进程），有些甚至更复杂，需要花费更多的时间。它们正在完成，我的程序正在正常使用ProcessBuilder启动其他进程。我确实读了每一个的输出。挂起的进程在距离结束不到一半的时候输出了正常日志。没有错误。另一件重要的事情是，将流程冻结在的方法不会生成任何输出，因此我假设在输出消耗方面没有问题

我的问题是：我不想终止进程，那么有没有办法

取消进程的运行？另外，为什么它处于虚拟机的
状态（在虚拟机中运行），并且仍然处于冻结状态？进程冻结在
java.lang.System.identityHashCode
方法中是否正常？为什么它使用我的CPU的0%（很少达到1%的峰值）

如果我能提供任何其他信息，请直接询问，我将很乐意在这里发布

提前谢谢

编辑：虽然我使用多线程，但每个线程都使用
ProcessBuilder
启动一个
进程
对象。因此，挂起过程是一个单独的JVM实例，只执行一个主线程。我将输出重定向到一个文件，但如前所述，进程挂起在一个不生成输出的方法上，因此我假设输出消耗没有问题

EDIT2：终止进程。随后的进程已启动并且运行顺利。
进程没有挂起，您只是碰巧发现它处于上面发布的状态。您可以判断，因为所讨论的线程不像其他线程那样说阻塞，所以它处于正常执行状态

为什么进程不再执行可能有不同的原因，但我可以向您保证，它们都与
identityHashCode
无关，因为这是一个经过良好测试的内部Java函数

进行：


比较几个挂起的JVM状态。如果始终与上面相同，则问题可能与哈希生成有关。如果没有：

发布更多相关代码，以便我们可以查看。如果问题不在这一行代码中，那么它必须在其他地方（com.rits.cloning.clonner
听起来是一个开始寻找的合理点）

告诉我们您试图归档的内容，有人可能会找到一个bug或更好的方法来归档，从而完全避免了导致问题的任何原因

为什么挂起的进程多次在日志上出现“-com.rits.cloning.Cloner.cloneInternal（java.lang.Object，java.util.Map）@bci=368，line=404（编译帧）”行？有没有一个自然的原因，或者说是绞死的根源，你的过程是在某种永恒的循环中制造克隆体（或者不管那条线意味着什么）？只是出于好奇。不是死锁，而是活锁？这很正常。它是对一个非常大的对象进行深度克隆，然后将其转换为一组继承的XML标记。因此，像这样克隆各种对象是正常的。您的代码依赖于字节码操作吗？我想您可以尝试获取identityHashCode方法的源代码——它是本机的，因此您需要从您正在使用的任何JVM实现中获取它，并复习您的C技能。@GiovaniGuizzo，JVM_IHashCode（）将直接调用Object.hashCode（）方法。如果对象是字符串，则不会调用任何hashCode（）重写，例如String.hashCode（）。我不知道Object.hashCode（）到底是做什么的，但它没有理由等待或计算任何东西。在任何合理的实现中，它都不会比简单地返回对象的地址更复杂。