jdk/jfr/jcmd/TestJcmdDump.java with slowdebug bits fails with AttachNotSupportedException

The following test failed with slowdebug bits:

jdk/jfr/jcmd/TestJcmdDump.java

Here's a snippet from the log file:

---------------- stderr ----------------
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file /proc/25212/root/tmp/.java_pid25212: target process 25212 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 jdk.jcmd/sun.tools.jcmd.JCmd.executeCommandForPid(JCmd.java:113)
        at jdk.jcmd/sun.tools.jcmd.JCmd.main(JCmd.java:97)

----------------------------------------

I have been seeing this test failed ONLY with slowdebug
bits since jdk-16+25 testing on 2020.11.20. However, I'm
only going to attach sightings for jdk-17.