The following test failed in the JDK21 CI:

java/net/httpclient/MappingResponseSubscriber.java

Here's a snippet from the log file:

test MappingResponseSubscriber.testAsBytes("https://localhost:54008/https1/chunk", true): success
test MappingResponseSubscriber.testAsBytes("http://localhost:54009/http2/fixed", true): failure
java.net.ConnectException
at java.net.http/jdk.internal.net.http.HttpClientImpl.send(HttpClientImpl.java:896)
at java.net.http/jdk.internal.net.http.HttpClientFacade.send(HttpClientFacade.java:133)
at MappingResponseSubscriber.testAsBytes(MappingResponseSubscriber.java:135)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:599)
at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:174)
at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:822)
at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:147)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at org.testng.TestRunner.privateRun(TestRunner.java:764)
at org.testng.TestRunner.run(TestRunner.java:585)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:384)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:378)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:337)
at org.testng.SuiteRunner.run(SuiteRunner.java:286)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1218)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
at org.testng.TestNG.runSuites(TestNG.java:1069)
at org.testng.TestNG.run(TestNG.java:1037)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:93)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:53)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1623)
Caused by: java.net.ConnectException
at java.net.http/jdk.internal.net.http.common.Utils.toConnectException(Utils.java:1053)
at java.net.http/jdk.internal.net.http.PlainHttpConnection.connectAsync(PlainHttpConnection.java:224)
at java.net.http/jdk.internal.net.http.PlainHttpConnection.checkRetryConnect(PlainHttpConnection.java:259)
at java.net.http/jdk.internal.net.http.PlainHttpConnection.lambda$connectAsync$2(PlainHttpConnection.java:235)
at java.base/java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:934)
at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:911)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1773)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
... 1 more
Caused by: java.nio.channels.ClosedChannelException
at java.base/sun.nio.ch.SocketChannelImpl.ensureOpen(SocketChannelImpl.java:202)
at java.base/sun.nio.ch.SocketChannelImpl.beginConnect(SocketChannelImpl.java:786)
at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:874)
at java.net.http/jdk.internal.net.http.PlainHttpConnection.lambda$connectAsync$1(PlainHttpConnection.java:208)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:571)
at java.net.http/jdk.internal.net.http.PlainHttpConnection.connectAsync(PlainHttpConnection.java:210)
... 9 more
HTTP2_VariableHandler received request to http://localhost:54009/http2/chunk
HTTP2_VariableHandler received request to http://localhost:54009/http2/chunk
HTTP2_VariableHandler received request to http://localhost:54009/http2/chunk
test MappingResponseSubscriber.testAsBytes("http://localhost:54009/http2/chunk", true): success
HTTP2_FixedLengthHandler received request to https://localhost:54010/https2/fixed
HTTP2_FixedLengthHandler received request to https://localhost:54010/https2/fixed
HTTP2_FixedLengthHandler received request to https://localhost:54010/https2/fixed
test MappingResponseSubscriber.testAsBytes("https://localhost:54010/https2/fixed", true): success
HTTP2_VariableHandler received request to https://localhost:54010/https2/chunk
HTTP2_VariableHandler received request to https://localhost:54010/https2/chunk
HTTP2_VariableHandler received request to https://localhost:54010/https2/chunk
test MappingResponseSubscriber.testAsBytes("https://localhost:54010/https2/chunk", true): success
config MappingResponseSubscriber.teardown(): success

===============================================
java/net/httpclient/MappingResponseSubscriber.java
Total tests run: 16, Passes: 15, Failures: 1, Skips: 0
===============================================

----------System.err:(17156/2068245)----------