src/share/vm/runtime/thread.cpp

*** 3390,3399 ****
--- 3390,3405 ----
    ALL_JAVA_THREADS(p) {
      if (p->claim_oops_do(true, cp)) {
        tc->do_thread(p);
      }
    }
+   // This function is used by ParallelSPCleanupTask in safepoint.cpp
+   // for cleaning up JavaThreads, but we have to keep the VMThread's
+   // _oops_do_parity field in sync so we don't miss a parallel GC on
+   // the VMThread.
+   VMThread* vmt = VMThread::vm_thread();
+   (void)vmt->claim_oops_do(true, cp);
  }
  
  // The system initialization in the library has three phases.
  //
  // Phase 1: java.lang.System class initialization