we are facing an issue every 2-3 days on a WildFly server which uses a ScheduledThreadPoolExecutor to execute some tasks in a transactions.

When this happens, the CPU reaches 100% and the server is not responsive any more.

From the Thread dump, I have noticed that we have about 100 Threads blocked on the getThreadId of the arjuna Transaction Manager.
We are using WildFly 16. Is it a known issue which is maybe solved in a newer release?
Any other suggestion, besides increasing the arjuna log level ?

java.lang.Thread.State: BLOCKED (on object monitor)
at com.arjuna.ats.arjuna.utils.ThreadUtil.getThreadId(ThreadUtil.java:71)
- waiting to lock <0x0000000542a53950> (a java.lang.Class for com.arjuna.ats.arjuna.utils.ThreadUtil)
at com.arjuna.ats.arjuna.coordinator.BasicAction.addChildThread(BasicAction.java:610)
- locked <0x000000071bc00b68> (a com.arjuna.ats.internal.jta.transaction.arjunacore.AtomicAction)
at com.arjuna.ats.internal.arjuna.thread.ThreadActionData.pushAction(ThreadActionData.java:93)
at com.arjuna.ats.internal.arjuna.thread.ThreadActionData.pushAction(ThreadActionData.java:69)
at com.arjuna.ats.arjuna.AtomicAction.begin(AtomicAction.java:124)
at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.<init>(TransactionImple.java:104)
at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.begin(BaseTransaction.java:98)
at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.begin(BaseTransactionManagerDelegate.java:78)
at org.wildfly.transaction.client.provider.jboss.JBossLocalTransactionProvider.createNewTransaction(JBossLocalTransactionProvider.java:128)
at org.wildfly.transaction.client.LocalTransactionContext.beginTransaction(LocalTransactionContext.java:188)
at org.wildfly.transaction.client.ContextTransactionManager.begin(ContextTransactionManager.java:62)
at org.wildfly.transaction.client.ContextTransactionManager.begin(ContextTransactionManager.java:54)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:233)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:388)
at org.jboss.as.ejb3.tx.LifecycleCMTTxInterceptor.processInvocation(LifecycleCMTTxInterceptor.java:68)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:60)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at org.jboss.as.ee.component.BasicComponentInstance.destroy(BasicComponentInstance.java:125)
at org.jboss.as.ejb3.component.stateless.StatelessSessionComponent$1.destroy(StatelessSessionComponent.java:69)
at org.jboss.as.ejb3.component.stateless.StatelessSessionComponent$1.destroy(StatelessSessionComponent.java:61)
at org.jboss.as.ejb3.pool.AbstractPool.doRemove(AbstractPool.java:80)
at org.jboss.as.ejb3.pool.AbstractPool.destroy(AbstractPool.java:69)
at org.jboss.as.ejb3.pool.strictmax.StrictMaxPool.stop(StrictMaxPool.java:171)
at org.jboss.as.ejb3.component.stateless.StatelessSessionComponent.done(StatelessSessionComponent.java:120)
at org.jboss.as.ejb3.component.EJBComponent.stop(EJBComponent.java:605)
at org.jboss.as.ee.component.ComponentStartService$2.run(ComponentStartService.java:78)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1348)
at java.lang.Thread.run(Thread.java:748)
at org.jboss.threads.JBossThread.run(JBossThread.java:485)

Thanks!