The following test failed in the JDK14 CI:

applications/renaissance/RenaissanceStressTest24H.java

Here's a snippet from the log file:

[stress.process.err] Iteration start: Jfr at Sun Nov 17 13:17:07 GMT 2019
[stress.process.err] Unexpected Exception in thread finagle-http-worker-3.
[stress.process.err] Failure(connection timed out: localhost/127.0.0.1:56865 at remote address: localhost/127.0.0.1:56865. Remote Info: Not Available, flags=0x08) with RemoteInfo -> Upstream Address: Not Available, Upstream id: Not Available, Downstream Address: localhost/127.0.0.1:56865, Downstream label: localhost:56865, Trace Id: 723d53e1383a0b93.723d53e1383a0b93<:723d53e1383a0b93 with Service -> localhost:56865
[stress.process.err] Caused by: com.twitter.finagle.ConnectionFailedException: connection timed out: localhost/127.0.0.1:56865 at remote address: localhost/127.0.0.1:56865. 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$1.run(BlockingTimeTrackingThreadFactory.scala:23)
[stress.process.err] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[stress.process.err] at java.base/java.lang.Thread.run(Thread.java:833)
[stress.process.err] Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: localhost/127.0.0.1:56865
[stress.process.err] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:267)
[stress.process.err] ... 11 more
[Sun Nov 17 13:18:17 GMT 2019] (1573996697417) Picker module is about to shutdown
Picker module expected time before shutdown for: Jcmd: 30s
Picker module expected time before shutdown for: Jfr: 3m 20s
Picker module expected time before shutdown for: Jstat: 5m
Picker module expected time before shutdown for: Monitor: 1m
Picker module expected time before shutdown for: NMT: 1m
Picker module expected time before shutdown for: Perfmon: 5m
Picker module finished at [Sun Nov 17 13:18:17 GMT 2019]: Monitor
Picker module finished at [Sun Nov 17 13:18:17 GMT 2019]: Perfmon
Picker module finished at [Sun Nov 17 13:18:17 GMT 2019]: NMT
Picker module finished at [Sun Nov 17 13:18:17 GMT 2019]: Jfr
Picker module finished at [Sun Nov 17 13:18:17 GMT 2019]: Jstat
Picker module finished at [Sun Nov 17 13:18:17 GMT 2019]: Jcmd
[Sun Nov 17 13:18:17 GMT 2019] (1573996697448) Picker module has been shutdown
[Sun Nov 17 13:18:17 GMT 2019] (1573996697448) Stress process is about to shutdown
WARNING: The process 69360 has already finished
[Sun Nov 17 13:18:19 GMT 2019] (1573996699716) Stress process has been shutdown
[Sun Nov 17 13:18:19 GMT 2019] Execution finished.
----------rerun:(40/5872)*----------

<snip>

result: Failed. Unexpected exit from test [exit code: -1073740791]


test result: Failed. Unexpected exit from test [exit code: -1073740791]

Starting this bug as confidential since the test is in closed (I think).
Update: Leonid said the failure sighting can be non-confidential.

Windows error code -1073740791 == 0xc0000409 == STATUS_STACK_BUFFER_OVERRUN