[infinispan-issues] [JBoss JIRA] (ISPN-8889) Data race in NonTxInvocationContext
Tristan Tarrant (Jira)
issues at jboss.org
Mon Aug 26 06:10:11 EDT 2019
[ https://issues.jboss.org/browse/ISPN-8889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tristan Tarrant updated ISPN-8889:
----------------------------------
Sprint: Sprint 10.0.0.Alpha1, Sprint 10.0.0.Alpha2, Sprint 9.4.0.Final, Sprint 10.0.0.Alpha0, Sprint 10.0.0.Beta1, DataGrid Sprint #31, DataGrid Sprint #32, DataGrid Sprint #33 (was: Sprint 10.0.0.Alpha1, Sprint 10.0.0.Alpha2, Sprint 9.4.0.Final, Sprint 10.0.0.Alpha0, Sprint 10.0.0.Beta1, DataGrid Sprint #31, DataGrid Sprint #32)
> Data race in NonTxInvocationContext
> -----------------------------------
>
> Key: ISPN-8889
> URL: https://issues.jboss.org/browse/ISPN-8889
> Project: Infinispan
> Issue Type: Bug
> Components: Core
> Affects Versions: 9.1.6.Final, 9.2.0.CR2
> Environment: Java 8 (Oracle JDK 8), Solaris SPARC
> Reporter: Peter Levart
> Assignee: Dan Berindei
> Priority: Major
> Labels: data-race
> Fix For: 10.0.0.Alpha3, 9.4.6.Final
>
> Attachments: DataRacer.java, DataRacer.java
>
>
> Got the following exceptions starting up an Infinispan node while joining the cluster:
> {noformat}
> 17:10:59.012 [remote-thread--p2-t8] ERROR org.infinispan.interceptors.impl.InvocationContextInterceptor - ISPN000136: Error executing command PutMapCommand, writing keys [11906696627, 11906696626, 11906696625, 11906696624, 11906696631, 11906696630, 11906696629, 11906696628...<9992 other elements>]
> java.lang.ClassCastException: java.util.HashMap$Node cannot be cast to java.util.HashMap$TreeNode
> at java.util.HashMap$TreeNode.moveRootToFront(HashMap.java:1832) ~[?:1.8.0_162]
> at java.util.HashMap$TreeNode.treeify(HashMap.java:1949) ~[?:1.8.0_162]
> at java.util.HashMap$TreeNode.split(HashMap.java:2175) ~[?:1.8.0_162]
> at java.util.HashMap.resize(HashMap.java:714) ~[?:1.8.0_162]
> at java.util.HashMap.putVal(HashMap.java:663) ~[?:1.8.0_162]
> at java.util.HashMap.put(HashMap.java:612) ~[?:1.8.0_162]
> at org.infinispan.context.impl.NonTxInvocationContext.putLookedUpEntry(NonTxInvocationContext.java:48) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.container.EntryFactoryImpl.wrapExternalEntry(EntryFactoryImpl.java:143) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.BaseDistributionInterceptor.wrapRemoteEntry(BaseDistributionInterceptor.java:222) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.BaseDistributionInterceptor.lambda$remoteGet$1(BaseDistributionInterceptor.java:192) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:656) ~[?:1.8.0_162]
> at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632) ~[?:1.8.0_162]
> at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) ~[?:1.8.0_162]
> at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962) ~[?:1.8.0_162]
> at org.infinispan.remoting.transport.AbstractRequest.complete(AbstractRequest.java:66) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.impl.MultiTargetRequest.onResponse(MultiTargetRequest.java:102) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.StaggeredRequest.onResponse(StaggeredRequest.java:50) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.impl.RequestRepository.addResponse(RequestRepository.java:53) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport.processResponse(JGroupsTransport.java:1302) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport.processMessage(JGroupsTransport.java:1205) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport.access$200(JGroupsTransport.java:123) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport$ChannelCallbacks.receive(JGroupsTransport.java:1340) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.jgroups.JChannel.up(JChannel.java:819) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:893) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FRAG3.up(FRAG3.java:171) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FlowControl.up(FlowControl.java:343) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FlowControl.up(FlowControl.java:343) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.pbcast.GMS.up(GMS.java:864) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:240) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.UNICAST3.deliverMessage(UNICAST3.java:1002) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.UNICAST3.handleDataReceived(UNICAST3.java:728) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:383) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:600) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:119) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:199) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:252) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.MERGE3.up(MERGE3.java:276) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.Discovery.up(Discovery.java:267) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.TP.passMessageUp(TP.java:1248) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.util.SubmitToThreadPool$SingleMessageHandler.run(SubmitToThreadPool.java:87) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_162]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_162]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_162]
> {noformat}
> Immediately suspected that plain HashMap is being modified from multiple threads without proper synchronization. But since I'm new to Infinispan, I can't know whether the usage of plain HashMap in NonTxInvocationContext is intentional and Infinispan code is relying on some external synchronization to be performed by other parts of system that calls NonTxInvocationContext.[lookupEntry|removeLookedUpEntry|putLookedUpEntry|getLookedUpEntries]. In any way, if this external synchronization is taking place, it has a bug and allows calling these methods concurrently without proper synchronization.
> I did some experiments to prove that and also to obtain stack traces of at least two of involved threads, but trivial things that I tried instrumenting those methods all involved some kind of synchronization and the symptom disappeared. I had to be extra smart to obtain the stack traces of two threads without inter-thread synchronization so that I could detect the data race. Here's how I instrumented NonTxInvocationContext code:
> {noformat}
> Index: core/src/main/java/org/infinispan/context/impl/NonTxInvocationContext.java
> IDEA additional info:
> Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
> <+>UTF-8
> ===================================================================
> --- core/src/main/java/org/infinispan/context/impl/NonTxInvocationContext.java (revision 6014e751c20daba1f00e23168281e02afb209905)
> +++ core/src/main/java/org/infinispan/context/impl/NonTxInvocationContext.java (date 1519744397000)
> @@ -22,6 +22,7 @@
> private Set<Object> lockedKeys;
> private Object lockOwner;
>
> + private final DataRacer dataRacer = new DataRacer();
>
> public NonTxInvocationContext(int numEntries, Address origin) {
> super(origin);
> @@ -35,22 +36,26 @@
>
> @Override
> public CacheEntry lookupEntry(Object k) {
> + dataRacer.detect();
> return lookedUpEntries.get(k);
> }
>
> @Override
> public void removeLookedUpEntry(Object key) {
> + dataRacer.detectAndWrite();
> lookedUpEntries.remove(key);
> }
>
> @Override
> public void putLookedUpEntry(Object key, CacheEntry e) {
> + dataRacer.detectAndWrite();
> lookedUpEntries.put(key, e);
> }
>
> @Override
> @SuppressWarnings("unchecked")
> public Map<Object, CacheEntry> getLookedUpEntries() {
> + dataRacer.detect();
> return (Map<Object, CacheEntry>)
> (lookedUpEntries == null ?
> Collections.emptyMap() : lookedUpEntries);
> {noformat}
> Attached, you will find the DataRacer source. While running with such patched Infinispan, I got some of the following:
> {noformat}
> java.lang.IllegalThreadStateException: Thread[remote-thread--p2-t4,5,main]: data race detected with writer of state: 271f7814a414 - see suppressed for writer thread stack trace
> at org.infinispan.context.impl.DataRacer.detect(DataRacer.java:37) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.context.impl.NonTxInvocationContext.lookupEntry(NonTxInvocationContext.java:39) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.NonTxDistributionInterceptor.addRemoteGet(NonTxDistributionInterceptor.java:405) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.NonTxDistributionInterceptor.handleRemoteReadWriteManyCommand(NonTxDistributionInterceptor.java:385) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.NonTxDistributionInterceptor.handleReadWriteManyCommand(NonTxDistributionInterceptor.java:303) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.NonTxDistributionInterceptor.visitPutMapCommand(NonTxDistributionInterceptor.java:143) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.write.PutMapCommand.acceptVisitor(PutMapCommand.java:80) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNextThenAccept(BaseAsyncInterceptor.java:98) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.impl.EntryWrappingInterceptor.setSkipRemoteGetsAndInvokeNextForManyEntriesCommand(EntryWrappingInterceptor.java:614) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.impl.EntryWrappingInterceptor.visitPutMapCommand(EntryWrappingInterceptor.java:385) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.write.PutMapCommand.acceptVisitor(PutMapCommand.java:80) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNext(BaseAsyncInterceptor.java:54) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.locking.NonTransactionalLockingInterceptor.handleWriteManyCommand(NonTransactionalLockingInterceptor.java:53) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.locking.AbstractLockingInterceptor.visitPutMapCommand(AbstractLockingInterceptor.java:179) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.write.PutMapCommand.acceptVisitor(PutMapCommand.java:80) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNext(BaseAsyncInterceptor.java:54) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.statetransfer.StateTransferInterceptor.handleNonTxWriteCommand(StateTransferInterceptor.java:306) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.statetransfer.StateTransferInterceptor.handleWriteCommand(StateTransferInterceptor.java:252) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.statetransfer.StateTransferInterceptor.visitPutMapCommand(StateTransferInterceptor.java:102) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.write.PutMapCommand.acceptVisitor(PutMapCommand.java:80) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNext(BaseAsyncInterceptor.java:54) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.impl.CacheMgmtInterceptor.visitPutMapCommand(CacheMgmtInterceptor.java:154) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.write.PutMapCommand.acceptVisitor(PutMapCommand.java:80) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNextAndExceptionally(BaseAsyncInterceptor.java:123) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.impl.InvocationContextInterceptor.visitCommand(InvocationContextInterceptor.java:90) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.BaseAsyncInterceptor.invokeNext(BaseAsyncInterceptor.java:56) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.DDAsyncInterceptor.handleDefault(DDAsyncInterceptor.java:54) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.DDAsyncInterceptor.visitPutMapCommand(DDAsyncInterceptor.java:90) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.write.PutMapCommand.acceptVisitor(PutMapCommand.java:80) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.DDAsyncInterceptor.visitCommand(DDAsyncInterceptor.java:50) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.impl.AsyncInterceptorChainImpl.invokeAsync(AsyncInterceptorChainImpl.java:234) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.remote.BaseRpcInvokingCommand.processVisitableCommandAsync(BaseRpcInvokingCommand.java:63) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.commands.remote.SingleRpcCommand.invokeAsync(SingleRpcCommand.java:57) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.inboundhandler.BasePerCacheInboundInvocationHandler.invokeCommand(BasePerCacheInboundInvocationHandler.java:94) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.invoke(BaseBlockingRunnable.java:99) [infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.runAsync(BaseBlockingRunnable.java:71) [infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.run(BaseBlockingRunnable.java:40) [infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_162]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_162]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_162]
> Suppressed: org.infinispan.context.impl.DataRacer$StackTrace: Thread[jgroups-13,tbd2-40757,5,main], state: 271f7814a414
> at org.infinispan.context.impl.DataRacer.write(DataRacer.java:59) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.context.impl.DataRacer.detectAndWrite(DataRacer.java:49) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.context.impl.NonTxInvocationContext.putLookedUpEntry(NonTxInvocationContext.java:51) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.container.EntryFactoryImpl.wrapExternalEntry(EntryFactoryImpl.java:143) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.BaseDistributionInterceptor.wrapRemoteEntry(BaseDistributionInterceptor.java:222) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.interceptors.distribution.BaseDistributionInterceptor.lambda$remoteGet$1(BaseDistributionInterceptor.java:192) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:656) ~[?:1.8.0_162]
> at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632) ~[?:1.8.0_162]
> at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) ~[?:1.8.0_162]
> at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962) ~[?:1.8.0_162]
> at org.infinispan.remoting.transport.AbstractRequest.complete(AbstractRequest.java:66) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.impl.MultiTargetRequest.onResponse(MultiTargetRequest.java:102) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.StaggeredRequest.onResponse(StaggeredRequest.java:50) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.impl.RequestRepository.addResponse(RequestRepository.java:53) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport.processResponse(JGroupsTransport.java:1302) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport.processMessage(JGroupsTransport.java:1205) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport.access$200(JGroupsTransport.java:123) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.infinispan.remoting.transport.jgroups.JGroupsTransport$ChannelCallbacks.receive(JGroupsTransport.java:1340) ~[infinispan-core-9.2.0-SNAPSHOT.jar:9.2.0-SNAPSHOT]
> at org.jgroups.JChannel.up(JChannel.java:819) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:893) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FRAG3.up(FRAG3.java:171) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FlowControl.up(FlowControl.java:343) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FlowControl.up(FlowControl.java:343) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.pbcast.GMS.up(GMS.java:864) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:240) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.UNICAST3.deliverMessage(UNICAST3.java:1002) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.UNICAST3.handleDataReceived(UNICAST3.java:728) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:383) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:600) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:119) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:199) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:252) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.MERGE3.up(MERGE3.java:276) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.Discovery.up(Discovery.java:267) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.protocols.TP.passMessageUp(TP.java:1248) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at org.jgroups.util.SubmitToThreadPool$SingleMessageHandler.run(SubmitToThreadPool.java:87) ~[jgroups-4.0.10.Final.jar:4.0.10.Final]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_162]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_162]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_162]
> {noformat}
> So here you have it. Either using plain HashMap in NonTxInvocationContext is wrong and ConcurrentHashMap should be used instead or some external synchronization has a bug and is inadequate. I hope this helps to fix it.
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