The following test timed out in the JDK18 CI:

vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine/TestDescription.java

Here's a snippet from the log file:

<<<<<<<< RedefineClasses() is successfully done
t:\\workspace\\open\\test\\hotspot\\jtreg\\vmTestbase\\nsk\\jvmti\\RedefineClasses\\StressRedefine\\stressRedefine.cpp: Failed to call RedefineClasses():
the function returned error 60: JVMTI_ERROR_INVALID_CLASS_FORMAT
For more info about this error see the JVMTI spec.
>>>>>>>> Invoke RedefineClasses():
new class byte count=2283
>>>>>>>> Invoke RedefineClasses():
new class byte count=2283
<<<<<<<< RedefineClasses() is successfully done
>>>>>>>> Invoke RedefineClasses():
new class byte count=2283
<<<<<<<< RedefineClasses() is successfully done
>>>>>>>> Invoke RedefineClasses():
new class byte count=2283
<<<<<<<< RedefineClasses() is successfully done
Timeout refired 1200 times
>>>>>>>>
----------System.err:(0/0)----------
----------rerun:(41/6545)*----------

< snip>

result: Error. Program `c:\ade\mesos\work_dir\jib-master\install\jdk-18+16-901\windows-x64-debug.jdk\jdk-18\fastdebug\bin\java' timed out (timeout set to 1200000ms, elapsed time including timeout handling was 1327406ms).


Please note there are quite a few exception thrown and
RedefineClasses failures reported in the log file. Those
failure modes appear to be intentional. The failure mode
being tracked by this bug is a time out.