Hello, Looking this up i found SOLR-5692, but that was solved a lifetime ago, so just checking if this is a familiar error and one i missing in Jira:
A client's Solr 8.2.0 cluster brought us the next StackOverflowError while running 8.2.0 on Java 8: Exception in thread "coreZkRegister-1-thread-3" java.lang.StackOverflowError at org.apache.logging.log4j.ThreadContext.getImmutableContext(ThreadContext.java:352) at org.apache.logging.log4j.core.impl.ThreadContextDataInjector$ForDefaultThreadContextMap.injectContextData(ThreadContextDataInjector.java:66) at org.apache.logging.log4j.core.impl.Log4jLogEvent.createContextData(Log4jLogEvent.java:473) at org.apache.logging.log4j.core.impl.Log4jLogEvent.<init>(Log4jLogEvent.java:331) at org.apache.logging.log4j.core.impl.DefaultLogEventFactory.createEvent(DefaultLogEventFactory.java:54) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:404) at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63) at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146) at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170) at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125) at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2108) at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2007) at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1866) at org.apache.logging.slf4j.Log4jLogger.info(Log4jLogger.java:179) at org.apache.solr.update.PeerSync.sync(PeerSync.java:172) at org.apache.solr.cloud.SyncStrategy.syncWithReplicas(SyncStrategy.java:187) at org.apache.solr.cloud.SyncStrategy.syncReplicas(SyncStrategy.java:131) at org.apache.solr.cloud.SyncStrategy.sync(SyncStrategy.java:109) at org.apache.solr.cloud.ShardLeaderElectionContext.runLeaderProcess(ElectionContext.java:400) at org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:172) at org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:137) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:309) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:218) at org.apache.solr.cloud.ShardLeaderElectionContext.rejoinLeaderElection(ElectionContext.java:703) at org.apache.solr.cloud.ShardLeaderElectionContext.runLeaderProcess(ElectionContext.java:449) at org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:172) at org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:137) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:309) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:218) at org.apache.solr.cloud.ShardLeaderElectionContext.rejoinLeaderElection(ElectionContext.java:703) at org.apache.solr.cloud.ShardLeaderElectionContext.runLeaderProcess(ElectionContext.java:449) at org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:172) at org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:137) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:309) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:218) at org.apache.solr.cloud.ShardLeaderElectionContext.rejoinLeaderElection(ElectionContext.java:703) at org.apache.solr.cloud.ShardLeaderElectionContext.runLeaderProcess(ElectionContext.java:449) at org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:172) at org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:137) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:309) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:218) ..... it repeats hundreds of times at org.apache.solr.cloud.ShardLeaderElectionContext.rejoinLeaderElection(ElectionContext.java:703) at org.apache.solr.cloud.ShardLeaderElectionContext.runLeaderProcess(ElectionContext.java:449) at org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:172) at org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:137) at org.apache.solr.cloud.LeaderElector.joinElection(LeaderElector.java:309) at org.apache.solr.cloud.ZkController.joinElection(ZkController.java:1479) at org.apache.solr.cloud.ZkController.register(ZkController.java:1219) at org.apache.solr.cloud.ZkController.register(ZkController.java:1171) at org.apache.solr.core.ZkContainer.lambda$registerInZk$0(ZkContainer.java:191) at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:209) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)