On our system, after some time we get this:
javax.ejb.EJBTransactionRolledbackException: ISPN000299: Unable to acquire lock after 15 seconds for key UnknownSessionID [4957576549555554536866505268565165695766655070536957516655656852] and requestor GlobalTransaction:<node1>:682146:local. Lock is held by GlobalTransaction:<node1>:681890:local

And then we start getting the following:

ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (default task-2) ISPN000136: Error executing command GetKeyValueCommand, writing keys []: java.lang.IllegalStateException: Transaction DummyTransaction{xid=DummyXid

{id=437353}, status=3} is not in a valid state to be invoking cache operations on.
at org.infinispan.interceptors.TxInterceptor.enlist(TxInterceptor.java:395)
...

ERROR [io.undertow.request] (default task-2) UT005023: Exception handling request to /contextpath/someXYZResource: java.lang.IllegalStateException: Transaction DummyTransaction{xid=DummyXid{id=437353}

, status=3} is not in a valid state to be invoking cache operations on.

continouously on most requests without being able to recover.
After restarting, again if at some point the "Unable to acquire lock after 15 seconds" happens, we start getting errors about the DummyTransaction, which never stop.

I believe "Unable to acquire lock after 15 seconds" should not lead to an unrecoverable state.

NOTE: Each node runs with:
`./standalone.sh -c=standalone-full-ha.xml -u=239.255.200.215 -b=$localIp -bmanagement=$localIp -bprivate=$localIp -Djboss.node.name=node1 -Djboss.socket.binding.port-offset=200` .

`jboss.node.name` and `$localIp` only changes between nodes.