The test fails with:

Testing top frames for events: jdk.SocketRead, jdk.SocketWrite (SocketInputStream and SocketOutputStream)
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Expected:
jdk.jfr.event.io.TestIOTopFrame::readSocket 6
jdk.jfr.event.io.TestIOTopFrame::writeSocket 3

Actual:
jdk.jfr.event.io.TestIOTopFrame::readSocket 6
jdk.jfr.event.io.TestIOTopFrame::writeSocket 3

Testing top frames for events: jdk.SocketRead, jdk.SocketWrite (SocketChannel and Socket adapters)
**************************************************************************************************
----------System.err:(19/1206)----------
java.io.IOException: Broken pipe
at java.base/sun.nio.ch.SocketDispatcher.write0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:65)
at java.base/sun.nio.ch.SocketChannelImpl.tryWrite(SocketChannelImpl.java:1442)
at java.base/sun.nio.ch.SocketChannelImpl.blockingWriteFully(SocketChannelImpl.java:1476)
at java.base/sun.nio.ch.SocketOutputStream.write(SocketOutputStream.java:65)
at jdk.jfr.event.io.TestIOTopFrame.writeSocket(TestIOTopFrame.java:305)
at jdk.jfr.event.io.TestIOTopFrame.writeSocketChannel(TestIOTopFrame.java:277)
at jdk.jfr.event.io.TestIOTopFrame.testSocketChannels(TestIOTopFrame.java:250)
at jdk.jfr.event.io.TestIOTopFrame.main(TestIOTopFrame.java:88)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1474)