The following test failed in the JDK15 CI:

applications/renaissance/RenaissanceStressTest24H.java

Here's a snippet from the log file:

[stress.process.err] Unexpected Exception in thread finagle-http-worker-14.
[stress.process.err] Unexpected Exception in thread finagle-http-worker-12.
[stress.process.err] Failure(connection timed out: localhost/127.0.0.1:16387 at remote address: localhost/127.0.0.1:16387. Remote Info: Not Available, flags=0x08) with RemoteInfo -> Upstream Address: Not Available, Upstream id: Not Available, Downstream Address: localhost/127.0.0.1:16387, Downstream label: localhost:16387, Trace Id: 0511cd90ca7cc88f.0511cd90ca7cc88f<:0511cd90ca7cc88f with Service -> localhost:16387
[stress.process.err] Caused by: com.twitter.finagle.ConnectionFailedException: connection timed out: localhost/127.0.0.1:16387 at remote address: localhost/127.0.0.1:16387. Remote Info: Not Available
[stress.process.err] at com.twitter.finagle.netty4.ConnectionBuilder$$anon$1.operationComplete(ConnectionBuilder.scala:99)
[stress.process.err] at com.twitter.finagle.netty4.ConnectionBuilder$$anon$1.operationComplete(ConnectionBuilder.scala:78)
[stress.process.err] at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511)
[stress.process.err] at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:504)
[stress.process.err] at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:483)
[stress.process.err] at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424)
[stress.process.err] at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:121)
[stress.process.err] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:269)
[stress.process.err] at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38)
[stress.process.err] at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:127)
[stress.process.err] at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
[stress.process.err] at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
[stress.process.err] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:466)
[stress.process.err] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
[stress.process.err] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
[stress.process.err] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
[stress.process.err] at com.twitter.finagle.util.BlockingTimeTrackingThreadFactory$$anon$1.run(BlockingTimeTrackingThreadFactory.scala:23)
[stress.process.err] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[stress.process.err] at java.base/java.lang.Thread.run(Thread.java:832)
[stress.process.err] Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: localhost/127.0.0.1:16387
[stress.process.err] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:267)
[stress.process.err] ... 11 more

There are many instances of this failure mode in the log file.

This failure might be due to some sort of network issue on
the test machine.