[WIP] CSDS getSubscribedResourcesMetadata concurrency fix #18
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Feb 27, 2024
As discovered by TSAN, the adsStream field is not synchronized.
```
WARNING: ThreadSanitizer: data race (pid=1625)
Read of size 4 at 0x00009b66fc88 by thread T23 (mutexes: write M0):
#0 io.grpc.xds.ControlPlaneClient.isReady()Z ControlPlaneClient.java:203
#1 io.grpc.xds.ControlPlaneClient.readyHandler()V ControlPlaneClient.java:211
#2 io.grpc.xds.ControlPlaneClient$AdsStream.onReady()V ControlPlaneClient.java:328
#3 io.grpc.xds.GrpcXdsTransportFactory$EventHandlerToCallListenerAdapter.onReady()V GrpcXdsTransportFactory.java:145
#4 io.grpc.PartialForwardingClientCallListener.onReady()V PartialForwardingClientCallListener.java:44
#5 io.grpc.ForwardingClientCallListener.onReady()V ForwardingClientCallListener.java:23
#6 io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onReady()V ForwardingClientCallListener.java:40
#7 io.grpc.PartialForwardingClientCallListener.onReady()V PartialForwardingClientCallListener.java:44
#8 io.grpc.ForwardingClientCallListener.onReady()V ForwardingClientCallListener.java:23
#9 io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onReady()V ForwardingClientCallListener.java:40
#10 io.grpc.internal.DelayedClientCall$DelayedListener.onReady()V DelayedClientCall.java:497
#11 io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamOnReady.runInternal()V ClientCallImpl.java:781
#12 io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamOnReady.runInContext()V ClientCallImpl.java:772
#13 io.grpc.internal.ContextRunnable.run()V ContextRunnable.java:37
#14 io.grpc.internal.SerializingExecutor.run()V SerializingExecutor.java:133
#15 java.util.concurrent.ThreadPoolExecutor.runWorker(Ljava/util/concurrent/ThreadPoolExecutor$Worker;)V ThreadPoolExecutor.java:1130
#16 java.util.concurrent.ThreadPoolExecutor$Worker.run()V ThreadPoolExecutor.java:630
#17 java.lang.Thread.run()V Thread.java:830
#18 (Generated Stub) <null>
Previous write of size 4 at 0x00009b66fc88 by thread T4 (mutexes: write M1, write M2, write M3, write M4, write M5):
#0 io.grpc.xds.ControlPlaneClient$AdsStream.cleanUp()V ControlPlaneClient.java:424
#1 io.grpc.xds.ControlPlaneClient$AdsStream.close(Ljava/lang/Exception;)V ControlPlaneClient.java:418
#2 io.grpc.xds.ControlPlaneClient$1.run()V ControlPlaneClient.java:130
#3 io.grpc.SynchronizationContext.drain()V SynchronizationContext.java:94
#4 io.grpc.SynchronizationContext.execute(Ljava/lang/Runnable;)V SynchronizationContext.java:126
#5 io.grpc.xds.XdsClientImpl.shutdown()V XdsClientImpl.java:207
#6 io.grpc.xds.SharedXdsClientPoolProvider$RefCountedXdsClientObjectPool.returnObject(Ljava/lang/Object;)Lio/grpc/xds/XdsClient; SharedXdsClientPoolProvider.java:144
#7 io.grpc.xds.SharedXdsClientPoolProvider$RefCountedXdsClientObjectPool.returnObject(Ljava/lang/Object;)Ljava/lang/Object; SharedXdsClientPoolProvider.java:102
#8 io.grpc.xds.XdsClientFederationTest.cleanUp()V XdsClientFederationTest.java:86
```
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