The following test failed in the JDK20 CI:

gc/TestFullGCCount.java

Here's a snippet from the log file:

#section:main
----------messages:(7/325)----------
command: main -Xlog:gc gc.TestFullGCCount
reason: User specified action: run main/othervm -Xlog:gc gc.TestFullGCCount
started: Wed Dec 07 12:33:02 UTC 2022
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.management
finished: Wed Dec 07 12:33:03 UTC 2022
elapsed time (seconds): 1.117
----------configuration:(3/43)----------
Boot Layer
  add modules: java.management

----------System.out:(104/6390)----------
[0.032s][info][gc] Using G1
[0.603s][info][gc] GC(0) Pause Young (Concurrent Start) (System.gc()) 3M->1M(372M) 78.863ms
[0.603s][info][gc] GC(1) Concurrent Mark Cycle
[0.629s][info][gc] GC(1) Pause Remark 2M->2M(14M) 1.880ms
[0.630s][info][gc] GC(1) Pause Cleanup 2M->2M(14M) 0.039ms
[0.630s][info][gc] GC(1) Concurrent Mark Cycle 26.648ms
[0.637s][info][gc] GC(2) Pause Young (Concurrent Start) (System.gc()) 2M->1M(14M) 2.838ms
[0.637s][info][gc] GC(3) Concurrent Mark Cycle
[0.642s][info][gc] GC(3) Pause Remark 1M->1M(10M) 1.592ms
[0.643s][info][gc] GC(3) Pause Cleanup 1M->1M(10M) 0.034ms
[0.643s][info][gc] GC(3) Concurrent Mark Cycle 6.077ms
[0.646s][info][gc] GC(4) Pause Young (Concurrent Start) (System.gc()) 1M->1M(10M) 3.533ms
[0.646s][info][gc] GC(5) Concurrent Mark Cycle
[0.658s][info][gc] GC(5) Pause Remark 1M->1M(10M) 3.093ms
[0.660s][info][gc] GC(5) Pause Cleanup 1M->1M(10M) 0.072ms
[0.660s][info][gc] GC(5) Concurrent Mark Cycle 13.624ms
[0.662s][info][gc] GC(6) Pause Young (Concurrent Start) (System.gc()) 1M->1M(10M) 1.342ms
[0.662s][info][gc] GC(7) Concurrent Mark Cycle
[0.669s][info][gc] GC(7) Pause Remark 1M->1M(10M) 2.324ms
[0.672s][info][gc] GC(7) Pause Cleanup 1M->1M(10M) 0.087ms
[0.672s][info][gc] GC(7) Concurrent Mark Cycle 9.233ms
[0.674s][info][gc] GC(8) Pause Young (Concurrent Start) (System.gc()) 1M->1M(190M) 1.999ms
[0.674s][info][gc] GC(9) Concurrent Mark Cycle
[0.682s][info][gc] GC(9) Pause Remark 1M->1M(14M) 2.208ms
[0.684s][info][gc] GC(9) Pause Cleanup 1M->1M(14M) 0.069ms
[0.684s][info][gc] GC(9) Concurrent Mark Cycle 10.534ms
[0.693s][info][gc] GC(10) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 8.582ms
[0.693s][info][gc] GC(11) Concurrent Mark Cycle
[0.714s][info][gc] GC(11) Pause Remark 1M->1M(14M) 9.284ms
[0.716s][info][gc] GC(11) Pause Cleanup 1M->1M(14M) 0.105ms
[0.716s][info][gc] GC(11) Concurrent Mark Cycle 23.064ms
[0.719s][info][gc] GC(12) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 2.824ms
[0.719s][info][gc] GC(13) Concurrent Mark Cycle
[0.727s][info][gc] GC(13) Pause Remark 1M->1M(14M) 2.196ms
[0.739s][info][gc] GC(13) Pause Cleanup 1M->1M(14M) 0.090ms
[0.739s][info][gc] GC(13) Concurrent Mark Cycle 20.239ms
[0.741s][info][gc] GC(14) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.231ms
[0.741s][info][gc] GC(15) Concurrent Mark Cycle
[0.762s][info][gc] GC(15) Pause Remark 1M->1M(14M) 2.136ms
[0.776s][info][gc] GC(15) Pause Cleanup 1M->1M(14M) 0.087ms
[0.776s][info][gc] GC(15) Concurrent Mark Cycle 35.388ms
[0.778s][info][gc] GC(16) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.360ms
[0.778s][info][gc] GC(17) Concurrent Mark Cycle
[0.784s][info][gc] GC(17) Pause Remark 1M->1M(14M) 2.048ms
[0.788s][info][gc] GC(17) Pause Cleanup 1M->1M(14M) 0.088ms
[0.790s][info][gc] GC(17) Concurrent Mark Cycle 12.094ms
[0.792s][info][gc] GC(18) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.495ms
[0.792s][info][gc] GC(19) Concurrent Mark Cycle
[0.803s][info][gc] GC(19) Pause Remark 1M->1M(14M) 1.875ms
[0.806s][info][gc] GC(19) Pause Cleanup 1M->1M(14M) 0.074ms
[0.806s][info][gc] GC(19) Concurrent Mark Cycle 14.634ms
[0.808s][info][gc] GC(20) Pause Young (Concurrent Start) (System.gc()) 1M->1M(192M) 1.825ms
[0.808s][info][gc] GC(21) Concurrent Mark Cycle
[0.820s][info][gc] GC(21) Pause Remark 1M->1M(14M) 4.792ms
[0.824s][info][gc] GC(21) Pause Cleanup 1M->1M(14M) 1.035ms
[0.824s][info][gc] GC(21) Concurrent Mark Cycle 15.157ms
[0.826s][info][gc] GC(22) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 2.122ms
[0.826s][info][gc] GC(23) Concurrent Mark Cycle
[0.845s][info][gc] GC(23) Pause Remark 1M->1M(14M) 1.462ms
[0.847s][info][gc] GC(23) Pause Cleanup 1M->1M(14M) 0.072ms
[0.847s][info][gc] GC(23) Concurrent Mark Cycle 20.912ms
[0.849s][info][gc] GC(24) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.353ms
[0.849s][info][gc] GC(25) Concurrent Mark Cycle
[0.860s][info][gc] GC(25) Pause Remark 1M->1M(14M) 3.916ms
[0.865s][info][gc] GC(25) Pause Cleanup 1M->1M(14M) 0.083ms
[0.865s][info][gc] GC(25) Concurrent Mark Cycle 16.646ms
[0.867s][info][gc] GC(26) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.359ms
[0.867s][info][gc] GC(27) Concurrent Mark Cycle
[0.887s][info][gc] GC(27) Pause Remark 1M->1M(14M) 1.954ms
[0.889s][info][gc] GC(27) Pause Cleanup 1M->1M(14M) 0.071ms
[0.889s][info][gc] GC(27) Concurrent Mark Cycle 21.804ms
[0.891s][info][gc] GC(28) Pause Young (Concurrent Start) (System.gc()) 1M->1M(192M) 2.433ms
[0.891s][info][gc] GC(29) Concurrent Mark Cycle
[0.897s][info][gc] GC(29) Pause Remark 1M->1M(14M) 1.866ms
[0.899s][info][gc] GC(29) Pause Cleanup 1M->1M(14M) 0.075ms
[0.899s][info][gc] GC(29) Concurrent Mark Cycle 8.231ms
[0.901s][info][gc] GC(30) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 0.935ms
[0.901s][info][gc] GC(31) Concurrent Mark Cycle
[0.920s][info][gc] GC(31) Pause Remark 1M->1M(14M) 16.175ms
[0.926s][info][gc] GC(31) Pause Cleanup 1M->1M(14M) 0.090ms
[0.927s][info][gc] GC(31) Concurrent Mark Cycle 26.918ms
[0.929s][info][gc] GC(32) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.123ms
[0.929s][info][gc] GC(33) Concurrent Mark Cycle
[0.950s][info][gc] GC(33) Pause Remark 1M->1M(14M) 2.920ms
[0.953s][info][gc] GC(33) Pause Cleanup 1M->1M(14M) 0.079ms
[0.953s][info][gc] GC(33) Concurrent Mark Cycle 23.972ms
[0.954s][info][gc] GC(34) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 1.282ms
[0.954s][info][gc] GC(35) Concurrent Mark Cycle
[0.960s][info][gc] GC(35) Pause Remark 1M->1M(14M) 1.618ms
[0.961s][info][gc] GC(35) Pause Cleanup 1M->1M(14M) 0.096ms
[0.961s][info][gc] GC(35) Concurrent Mark Cycle 7.062ms
[0.963s][info][gc] GC(36) Pause Young (Concurrent Start) (System.gc()) 1M->1M(192M) 1.511ms
[0.963s][info][gc] GC(37) Concurrent Mark Cycle
[0.967s][info][gc] GC(37) Pause Remark 1M->1M(14M) 1.354ms
[0.969s][info][gc] GC(37) Pause Cleanup 1M->1M(14M) 0.086ms
[0.969s][info][gc] GC(37) Concurrent Mark Cycle 6.450ms
[0.976s][info][gc] GC(38) Pause Young (Concurrent Start) (System.gc()) 1M->1M(14M) 6.280ms
[0.976s][info][gc] GC(39) Concurrent Mark Cycle
[0.996s][info][gc] GC(39) Pause Remark 1M->1M(14M) 2.758ms
[0.998s][info][gc] GC(39) Pause Cleanup 1M->1M(14M) 0.303ms
[0.999s][info][gc] GC(39) Concurrent Mark Cycle 23.000ms
Checking: G1 Young Generation
Checking: G1 Old Generation
Checking: G1 Concurrent GC
----------System.err:(31/1836)----------
Collector 'G1 Concurrent GC' has increment 2 at iteration 0
Collector 'G1 Concurrent GC' has increment 2 at iteration 1
Collector 'G1 Concurrent GC' has increment 2 at iteration 2
Collector 'G1 Concurrent GC' has increment 2 at iteration 3
Collector 'G1 Concurrent GC' has increment 2 at iteration 4
Collector 'G1 Concurrent GC' has increment 2 at iteration 5
Collector 'G1 Concurrent GC' has increment 2 at iteration 6
Collector 'G1 Concurrent GC' has increment 2 at iteration 7
Collector 'G1 Concurrent GC' has increment 2 at iteration 8
Collector 'G1 Concurrent GC' has increment 2 at iteration 9
Collector 'G1 Concurrent GC' has increment 2 at iteration 10
Collector 'G1 Concurrent GC' has increment 2 at iteration 11
Collector 'G1 Concurrent GC' has increment 2 at iteration 12
Collector 'G1 Concurrent GC' has increment 2 at iteration 13
Collector 'G1 Concurrent GC' has increment 2 at iteration 14
Collector 'G1 Concurrent GC' has increment 2 at iteration 15
Collector 'G1 Concurrent GC' has increment 2 at iteration 16
Collector 'G1 Concurrent GC' has increment 2 at iteration 17
Collector 'G1 Concurrent GC' has increment 2 at iteration 18

java.lang.RuntimeException: FAILED: System.gc collections miscounted.
at gc.TestFullGCCount.main(TestFullGCCount.java:89)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1599)

JavaTest Message: Test threw exception: java.lang.RuntimeException: FAILED: System.gc collections miscounted.
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: FAILED: System.gc collections miscounted.
----------rerun:(40/5993)*----------