The following test failed in the JDK15 CI:

vmTestbase/nsk/jvmti/scenarios/contention/TC05/tc05t001/TestDescription.java

Here's a snippet from the log file:

#section:main
----------messages:(4/305)----------
command: main -agentlib:tc05t001=verbose,waittime=5 nsk.jvmti.scenarios.contention.TC05.tc05t001
reason: User specified action: run main/othervm/native -agentlib:tc05t001=verbose,waittime=5 nsk.jvmti.scenarios.contention.TC05.tc05t001
Mode: othervm [/othervm specified]
elapsed time (seconds): 1.234
----------configuration:(0/0)----------
----------System.out:(30/1972)----------
- tc05t001.cpp, 322: Timeout: 300000 msc
- tc05t001.cpp, 149: Prepare: find tested thread
- tc05t001.cpp, 167: thread #0 (main): 0000004B82A26D48
- tc05t001.cpp, 167: thread #1 (Reference Handler): 0000004B82A26D50
- tc05t001.cpp, 167: thread #2 (Finalizer): 0000004B82A26D58
- tc05t001.cpp, 167: thread #3 (Signal Dispatcher): 0000004B82A26D60
- tc05t001.cpp, 167: thread #4 (Attach Listener): 0000004B82A26D68
- tc05t001.cpp, 167: thread #5 (Notification Thread): 0000004B82A26D70
- tc05t001.cpp, 167: thread #6 (Common-Cleaner): 0000004B82A26D78
- tc05t001.cpp, 167: thread #7 (MainThread): 0000004B82A26D80
- tc05t001.cpp, 167: thread #8 (Debuggee Thread): 0000004B82A26D88
- tc05t001.cpp, 167: thread #9 (JVMTI agent thread): 0000004B82A26D90
- tc05t001.cpp, 88: MonitorWait event:
- tc05t001.cpp, 90: thread: 0000004B82A26EC8, object: 0000004B82A26ED0, timeout: 1
- tc05t001.cpp, 92: time: 6652760525777840
- tc05t001.cpp, 94: thread CPU time: 0
- tc05t001.cpp, 127: MonitorWaited event:
- tc05t001.cpp, 129: thread: 0000004B82A26EC8, object: 0000004B82A26ED0, timed_out: true
- tc05t001.cpp, 131: GetTime: 6652760593184950
- tc05t001.cpp, 133: thread CPU time: 31250000
- tc05t001.cpp, 257: Number of MonitorWait events: 1
- tc05t001.cpp, 262: Number of MonitorWaited events: 1
- tc05t001.cpp, 268: Time frame between the events: 67407110 ns
- tc05t001.cpp, 280: Thread CPU time between the events: 31250000 ns
The following fake exception stacktrace is for failure analysis.
nsk.share.Fake_Exception_for_RULE_Creation: (tc05t001.cpp:282) (waitedThreadCpuTime - waitThreadCpuTime) < (EXPECTED_ACCURACY * 1000000)
at nsk_lvcomplain(nsk_tools.cpp:172)
# ERROR: tc05t001.cpp, 282: (waitedThreadCpuTime - waitThreadCpuTime) < (EXPECTED_ACCURACY * 1000000)
# verified assertion is FALSE
waitedThreadCpuTime: 31250000, waitThreadCpuTime: 0, waitedThreadCpuTime - waitThreadCpuTime: 31250000
----------System.err:(3/175)----------
java version "15-ea" 2020-09-15
Java(TM) SE Runtime Environment (fastdebug build 15-ea+12-428)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 15-ea+12-428, mixed mode)
----------rerun:(40/5882)*----------