error is:
java.io.IOException: File exists
at sun.tools.attach.BsdVirtualMachine.createAttachFile(Native Method)
at sun.tools.attach.BsdVirtualMachine.<init>(BsdVirtualMachine.java:74)
at sun.tools.attach.BsdAttachProvider.attachVirtualMachine(BsdAttachProvider.java:63)
at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:214)
at sun.tools.jcmd.JCmd.executeCommandForPid(JCmd.java:139)
at sun.tools.jcmd.JCmd.main(JCmd.java:128)

reason is race condition, 2 or more threads see that no .java_pid file exists and then try call createAttachFile, but only one process succeeds, other fails

for the moment reproduced only on macos