TEST_BUG: CI java/rmi/activation/CommandEnvironment/SetChildEnv.java intermittent failure

java/rmi/activation/CommandEnvironment/SetChildEnv.java has been observed to fail intermittently in CI

TEST FAILED: rmid subprocess produced mangled debugExec line
RMID: shutdown()
RMID: ActivationSystem.shutdown()
activation daemon shut down
RMID: Shutdown successful after 806ms.
RMID: Removing rmid's old log file.
TestFailedException: TEST FAILED: rmid subprocess produced mangled debugExec line
at TestLibrary.bomb(TestLibrary.java:121)
at TestLibrary.bomb(TestLibrary.java:124)
at SetChildEnv.main(SetChildEnv.java:150)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:831)

JavaTest Message: Test threw exception: TestFailedException: TEST FAILED: rmid subprocess produced mangled debugExec line
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: TestFailedException: TEST FAILED: rmid subprocess produced mangled debugExec line

although it's an RMID test failure - issue look like a test infra issue