Flaky-test: ZkSessionExpireTest.cleanup hangs

[lhotari]

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Example failure

https://github.com/apache/pulsar/actions/runs/11125404278/job/30927545059?pr=23327#step:13:107

Exception stacktrace

ZkSessionExpireTest.cleanup hangs in ModularLoadManagerImpl.disableBroker

"main" #1 [2383] prio=5 os_prio=0 cpu=101566.56ms elapsed=3520.41s tid=0x00007f3618030a30 nid=2383 waiting on condition  [0x00007f3621f54000]
   java.lang.Thread.State: WAITING (parking)
	at jdk.internal.misc.Unsafe.park(java.base@21.0.4/Native Method)
	- parking to wait for  <0x0000100041604dc8> (a java.util.concurrent.CompletableFuture$Signaller)
	at java.util.concurrent.locks.LockSupport.park(java.base@21.0.4/LockSupport.java:221)
	at java.util.concurrent.CompletableFuture$Signaller.block(java.base@21.0.4/CompletableFuture.java:1864)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock(java.base@21.0.4/ForkJoinPool.java:3780)
	at java.util.concurrent.ForkJoinPool.managedBlock(java.base@21.0.4/ForkJoinPool.java:3725)
	at java.util.concurrent.CompletableFuture.waitingGet(java.base@21.0.4/CompletableFuture.java:1898)
	at java.util.concurrent.CompletableFuture.join(java.base@21.0.4/CompletableFuture.java:2117)
	at org.apache.pulsar.broker.loadbalance.impl.ModularLoadManagerImpl.disableBroker(ModularLoadManagerImpl.java:603)
	at org.apache.pulsar.broker.loadbalance.impl.ModularLoadManagerWrapper.disableBroker(ModularLoadManagerWrapper.java:47)
	at org.apache.pulsar.broker.service.BrokerService.unloadNamespaceBundlesGracefully(BrokerService.java:949)
	at org.apache.pulsar.broker.service.BrokerService.unloadNamespaceBundlesGracefully(BrokerService.java:936)
	at org.apache.pulsar.broker.PulsarService.closeAsync(PulsarService.java:520)
	at org.apache.pulsar.broker.PulsarService.close(PulsarService.java:479)
	at org.apache.pulsar.broker.service.NetworkErrorTestBase.cleanup(NetworkErrorTestBase.java:215)
	at org.apache.pulsar.broker.service.ZkSessionExpireTest.cleanup(ZkSessionExpireTest.java:50)

Thread dump: https://gist.github.com/lhotari/68578ba1354d4833af489b9ac3658c8c
Analysed in jstack.review: https://jstack.review/?https://gist.github.com/lhotari/68578ba1354d4833af489b9ac3658c8c#tda_1_dump

Are you willing to submit a PR?

• I'm willing to submit a PR!