--- old/test/hotspot/jtreg/vmTestbase/nsk/jdwp/VirtualMachine/InstanceCounts/instanceCounts001/instanceCounts001.java	2018-06-06 00:31:30.379794258 +0200
+++ new/test/hotspot/jtreg/vmTestbase/nsk/jdwp/VirtualMachine/InstanceCounts/instanceCounts001/instanceCounts001.java	2018-06-06 00:31:30.119783031 +0200
@@ -165,10 +165,10 @@
         if (!isDebuggeeReady())
             return;
 
-        // Note!
-        // Test broken - assumes that no GC is run before heap walk.
-        // G1 fails, just like ZGC, if en explicitly GC is done here.
-        // forceGC();
+        // Note! This test is broken, in the sense that it incorrectly assumes
+        // that no GC can happen before it walks the heap. In practice, it seems
+        // to only affect this test when using ZGC. However, this test will also
+        // fail when using other GCs if an explicit GC is done here.
 
         int expectedCount = instanceCounts001a.expectedCount;