Fei writes:
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FYI: I found that following test fails with Zacas when running in QEMU system (9.1.0):
    $ make test TEST="java/lang/management/ThreadMXBean/VirtualThreadDeadlocks.java" JTREG="VM_OPTIONS=-XX:+UnlockExperimentalVMOptions -XX:+UseZacas;TIMEOUT_FACTOR=32"

Error message:
STDOUT:
thread1 => Thread[#23,Thread-1,5,MainThreadGroup]
thread2 => Thread[#24,Thread-2,5,MainThreadGroup]
Waiting for thread1 and thread2 to deadlock ...
findMonitorDeadlockedThreads => null
expected => [23, 24]
STDERR:
java.lang.RuntimeException: Unexpected result
        at VirtualThreadDeadlocks.main(VirtualThreadDeadlocks.java:108)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
        at java.base/java.lang.reflect.Method.invoke(Method.java:565)
        at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
        at java.base/java.lang.Thread.run(Thread.java:1447)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Unexpected result
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Unexpected result
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