8298296: gc/TestFullGCCount.java fails with "System.gc collections miscounted."

Reviewed-by: tschatzl, ayang

Author: Kim Barrett

test/hotspot/jtreg/ProblemList.txt

@@ -80,7 +80,6 @@ gc/stress/gclocker/TestGCLockerWithG1.java 8180622 generic-all
 gc/stress/TestJNIBlockFullGC/TestJNIBlockFullGC.java 8192647 generic-all
 gc/metaspace/CompressedClassSpaceSizeInJmapHeap.java 8241293,8298073 macosx-x64,macosx-aarch64
 gc/stress/TestStressG1Humongous.java 8286554 windows-x64
-gc/TestFullGCCount.java 8298296 linux-x64
 
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test/hotspot/jtreg/gc/TestFullGCCount.java

@@ -29,6 +29,8 @@
  * @summary JMM GC counters overcount in some cases
  * @comment Shenandoah has "ExplicitGCInvokesConcurrent" on by default
  * @requires !(vm.gc == "Shenandoah" & vm.opt.ExplicitGCInvokesConcurrent != false)
+ * @comment G1 has separate counters for STW Full GC and concurrent GC.
+ * @requires !(vm.gc == "G1" & vm.opt.ExplicitGCInvokesConcurrent)
  * @requires vm.gc != "Z"
  * @modules java.management
  * @run main/othervm -Xlog:gc gc.TestFullGCCount