jdk/jfr/event/oldobject/TestClassLoaderLeak.java failed with "RuntimeException: Could not find class leak"

The following test failed in the JDK16 CI:

jdk/jfr/event/oldobject/TestClassLoaderLeak.java

Here's a snippet from the log file:

#section:main
----------messages:(5/361)----------
command: main -XX:TLABSize=2k jdk.jfr.event.oldobject.TestClassLoaderLeak
reason: User specified action: run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestClassLoaderLeak
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr --add-exports jdk.jfr/jdk.jfr.internal.test=ALL-UNNAMED
elapsed time (seconds): 41.239
----------configuration:(4/115)----------
Boot Layer
  add modules: jdk.jfr
  add exports: jdk.jfr/jdk.jfr.internal.test ALL-UNNAMED

----------System.out:(0/0)----------
----------System.err:(14/901)----------
java.lang.RuntimeException: Could not find class leak
at jdk.test.lib.Asserts.fail(Asserts.java:594)
at jdk.jfr.event.oldobject.TestClassLoaderLeak.main(TestClassLoaderLeak.java:79)
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:567)
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: java.lang.RuntimeException: Could not find class leak
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Could not find class leak
----------rerun:(40/7926)*----------