Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8231309

Shenandoah: Traversal GC tries to retire a PLAB that points to EU region

    XMLWordPrintable

    Details

    • Subcomponent:
      gc

      Description

      Reproduce:
      1) Apply patch following patch:

      # HG changeset patch
      # Parent 94bb65cb37d310e64e486a93d9e55ccb1cc2f8c6
      8231293: Shenandoah: Traversal fails JVMTI tests

      diff -r 94bb65cb37d3 -r 6973ca5f20b3 src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp
      --- a/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp Fri Sep 20 11:07:52 2019 +0100
      +++ b/src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp Fri Sep 20 09:02:52 2019 -0400
      @@ -696,6 +696,7 @@

         void work(uint worker_id) {
           ShenandoahParallelWorkerSession worker_session(worker_id);
      + ShenandoahEvacOOMScope evac_scope;
           ShenandoahTraversalFixRootsClosure cl;
           ShenandoahForwardedIsAliveClosure is_alive;
           _rp->roots_do<ShenandoahForwardedIsAliveClosure, ShenandoahTraversalFixRootsClosure>(worker_id, &is_alive, &cl);


      2) $ CONF=linux-x86_64-server-fastdebug make images run-test TEST=vmTestbase/nsk/jvmti/scenarios/allocation/AP01/ap01t001/ TEST_VM_OPTS="-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal"

      (gdb) p *this
      $1 = {<CHeapObj<(MemoryType)5>> = {<AllocatedObj> = {_vptr.AllocatedObj = 0x2b515bd2f3d0 <vtable for PLAB+16>}, <No data fields>},
        head = '\361' <repeats 31 times>, <incomplete sequence \361>, _word_sz = 516, _bottom = 0xffe40000, _top = 0xffe400f0, _end = 0xffe41010, _hard_end = 0xffe41020,
        _allocated = 774, _wasted = 66, _undo_wasted = 0, tail = '\361' <repeats 31 times>, <incomplete sequence \361>, static AlignmentReserve = 2}

      Region:
      | 3806|EU |BTE ffe40000, ffe40000, ffe80000|TAMS ffe40000|U 0B|T 0B|G 0B|S 0B|L 0B|CP 0|SN 0, 0, 0, 0


        Attachments

          Issue Links

            Activity

              People

              Assignee:
              zgu Zhengyu Gu
              Reporter:
              zgu Zhengyu Gu
              Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved: