The following test failed in the JDK20 CI:

serviceability/jvmti/vthread/VThreadNotifyFramePopTest/VThreadNotifyFramePopTest.java

Here's a log file snippet:

----------System.err:(41/2939)----------
java version "20-ea" 2023-03-21
Java(TM) SE Runtime Environment (fastdebug build 20-ea+2-10)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 20-ea+2-10, mixed mode)
java.net.UnknownHostException: openjdk.java.net
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:560)
at java.base/java.net.Socket.connect(Socket.java:666)
at java.base/java.net.Socket.connect(Socket.java:600)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:183)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:531)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:636)
at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:279)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:384)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:406)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1308)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1241)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1127)
at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1056)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1661)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1585)
at java.base/java.net.URL.openStream(URL.java:1162)
at VThreadNotifyFramePopTest.run4(VThreadNotifyFramePopTest.java:75)
at VThreadNotifyFramePopTest.run3(VThreadNotifyFramePopTest.java:70)
at VThreadNotifyFramePopTest.run2(VThreadNotifyFramePopTest.java:67)
at VThreadNotifyFramePopTest.run(VThreadNotifyFramePopTest.java:64)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:577)
at java.base/java.util.concurrent.ThreadPerTaskExecutor$ThreadBoundFuture.run(ThreadPerTaskExecutor.java:352)
at java.base/java.lang.VirtualThread.run(VirtualThread.java:287)
at java.base/java.lang.VirtualThread$VThreadContinuation.lambda$new$0(VirtualThread.java:174)
at java.base/jdk.internal.vm.Continuation.enter0(Continuation.java:327)
at java.base/jdk.internal.vm.Continuation.enter(Continuation.java:320)
java.lang.RuntimeException: VThreadNotifyFramePopTest failed!
at VThreadNotifyFramePopTest.main(VThreadNotifyFramePopTest.java:111)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:1596)

JavaTest Message: Test threw exception: java.lang.RuntimeException: VThreadNotifyFramePopTest failed!
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: VThreadNotifyFramePopTest failed!
----------rerun:(38/6639)*----------