(process) java/lang/ProcessBuilder/UnblockSignals.java fails

The following test failed in the JDK20 CI:

java/lang/ProcessBuilder/UnblockSignals.java

Here's a snippet from the log file:

#section:main
----------messages:(6/236)----------
command: main UnblockSignals
reason: User specified action: run main/othervm UnblockSignals
started: Sat Dec 17 20:13:15 GMT 2022
Mode: othervm [/othervm specified]
finished: Sat Dec 17 20:14:42 GMT 2022
elapsed time (seconds): 86.496
----------configuration:(0/0)----------
----------System.out:(2/59)----------
Child 6587, [sleep, 30]
Child 6590, [kill, -s, QUIT, 6587]
----------System.err:(11/663)----------
java.lang.RuntimeException: Kill process failed, exit status: 1
at UnblockSignals.main(UnblockSignals.java:45)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1623)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Kill process failed, exit status: 1
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Kill process failed, exit status: 1
----------rerun:(45/6493)*----------