The following test failed in the JDK24 CI:

gc/TestDisableExplicitGC.java

Here's a snippet from the log file:

#section:main
----------messages:(7/533)----------
command: main -XX:+DisableExplicitGC -Xlog:gc=debug gc.TestDisableExplicitGC
reason: User specified action: run main/othervm/fail -XX:+DisableExplicitGC -Xlog:gc=debug gc.TestDisableExplicitGC
started: Thu Jul 25 04:16:04 UTC 2024
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base,jdk.management --add-exports java.base/jdk.internal.misc=ALL-UNNAMED --add-exports jdk.management/com.sun.management.internal=ALL-UNNAMED
finished: Thu Jul 25 04:16:27 UTC 2024
elapsed time (seconds): 23.519
----------configuration:(5/211)----------
Boot Layer
  add modules: java.base jdk.management
  add exports: java.base/jdk.internal.misc ALL-UNNAMED
               jdk.management/com.sun.management.internal ALL-UNNAMED

----------System.out:(9/527)----------
[0.013s][info][gc] Using G1
[0.014s][debug][gc] ConcGCThreads: 2 offset 16
[0.014s][debug][gc] ParallelGCThreads: 8
[0.014s][debug][gc] Initialize mark stack with 4096 chunks, maximum 536870912
[21.656s][info ][gc] GC(0) Pause Young (Concurrent Start) (CodeCache GC Threshold) 5M->1M(488M) 8.010ms
[21.656s][info ][gc] GC(1) Concurrent Mark Cycle
[21.707s][info ][gc] GC(1) Pause Remark 2M->2M(10M) 40.760ms
[21.711s][info ][gc] GC(1) Pause Cleanup 2M->2M(10M) 0.082ms
[21.711s][info ][gc] GC(1) Concurrent Mark Cycle 55.489ms
----------System.err:(1/15)----------
STATUS:Passed.
----------rerun:(49/7579)*----------

<snip>

result: Failed. Execution passed unexpectedly:


test result: Failed. Execution passed unexpectedly:


So the test has "STATUS:Passed.", but ended with:

> result: Failed. Execution passed unexpectedly:

I have no idea what that means.

This same failure mode was logged in this bug from ~8 years ago:

JDK-8166221 gc/TestDisableExplicitGC.java fails mysteriously