serviceability/attach/AttachSetGetFlag.java failed with com.sun.tools.attach.AttachNotSupportedException:

----------System.err:(16/1207)----------
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file /proc/11898/root/tmp/.java_pid11898: target process 11898 doesn't respond within 10500ms or HotSpot VM not loaded
at jdk.attach/sun.tools.attach.VirtualMachineImpl.<init>(VirtualMachineImpl.java:103)
at jdk.attach/sun.tools.attach.AttachProviderImpl.attachVirtualMachine(AttachProviderImpl.java:58)
at jdk.attach/com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:207)
at AttachSetGetFlag.testGetFlag(AttachSetGetFlag.java:85)
at AttachSetGetFlag.main(AttachSetGetFlag.java:56)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:830)

JavaTest Message: Test threw exception: com.sun.tools.attach.AttachNotSupportedException
JavaTest Message: shutting down test