test/hotspot/jtreg/vmTestbase/nsk/jdwp/VirtualMachine/InstanceCounts/instanceCounts001/instanceCounts001.java

*** 59,68 ****
--- 59,69 ----
   *         Also, test performs check for case when incorrect data is sent in command:
   *                 - create command with refTypesCount < 0, expect ILLEGAL_ARGUMENT error
   *     Finally, debugger sends debuggee signal to quit, waits for it exits
   *     and exits too with the proper exit code.
   *
+  * @requires vm.gc != "Z"
   * @library /vmTestbase /test/hotspot/jtreg/vmTestbase
   *          /test/lib
   * @run driver jdk.test.lib.FileInstaller . .
   * @build nsk.jdwp.VirtualMachine.InstanceCounts.instanceCounts001.instanceCounts001
   *        nsk.jdwp.VirtualMachine.InstanceCounts.instanceCounts001.instanceCounts001a
*** 162,171 ****
--- 163,177 ----
          pipe.println(instanceCounts001a.COMMAND_CREATE_TEST_INSTANCES);
  
          if (!isDebuggeeReady())
              return;
  
+         // 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;
  
          String classNames[];
  
          classNames = new String[] { createTypeSignature(testClass1) };