The following test failed in the JDK13 CI:

vmTestbase/nsk/jvmti/scenarios/contention/TC04/tc04t001/TestDescription.java

Here's a snippet of the log file:

#section:main
----------messages:(4/292)----------
command: main -agentlib:tc04t001=-waittime=5 nsk.jvmti.scenarios.contention.TC04.tc04t001
reason: User specified action: run main/othervm/native -agentlib:tc04t001=-waittime=5 nsk.jvmti.scenarios.contention.TC04.tc04t001
Mode: othervm [/othervm specified]
elapsed time (seconds): 16.187
----------configuration:(0/0)----------
----------System.out:(12/674)----------
Started recording 1. No limit specified, using maxsize=250MB as default.

Use jcmd 35000 JFR.dump name=1 filename=FILEPATH to copy recording data to file.
The following fake exception stacktrace is for failure analysis.
nsk.share.Fake_Exception_for_RULE_Creation: (tc04t001.cpp:267) enterEventsCount == 199
at nsk_lvcomplain(nsk_tools.cpp:172)
# ERROR: tc04t001.cpp, 267: enterEventsCount == 199
# verified assertion is FALSE
# ERROR: tc04t001.cpp, 270: Number of MonitorContendedEnter events: 197
# ERROR: tc04t001.cpp, 275: enteredEventsCount == 199
# verified assertion is FALSE
# ERROR: tc04t001.cpp, 278: Number of MonitorContendedEntered events: 197
----------System.err:(0/0)----------
----------rerun:(36/5854)*----------