--- old/src/share/vm/utilities/taskqueue.hpp	2013-02-28 17:28:53.801433497 -0800
+++ new/src/share/vm/utilities/taskqueue.hpp	2013-02-28 17:28:53.565585175 -0800
@@ -321,7 +321,7 @@
 void GenericTaskQueue<E, F, N>::oops_do(OopClosure* f) {
   // tty->print_cr("START OopTaskQueue::oops_do");
   uint iters = size();
-  uint index = _bottom;
+  uint index = OrderAccess::load_acquire(&_bottom);
   for (uint i = 0; i < iters; ++i) {
     index = decrement_index(index);
     // tty->print_cr("  doing entry %d," INTPTR_T " -> " INTPTR_T,
@@ -338,7 +338,7 @@
 bool GenericTaskQueue<E, F, N>::push_slow(E t, uint dirty_n_elems) {
   if (dirty_n_elems == N - 1) {
     // Actually means 0, so do the push.
-    uint localBot = _bottom;
+    uint localBot = OrderAccess::load_acquire(&_bottom);
     // g++ complains if the volatile result of the assignment is unused.
     const_cast<E&>(_elems[localBot] = t);
     OrderAccess::release_store(&_bottom, increment_index(localBot));
@@ -390,7 +390,7 @@
 template<class E, MEMFLAGS F, unsigned int N>
 bool GenericTaskQueue<E, F, N>::pop_global(E& t) {
   Age oldAge = _age.get();
-  uint localBot = _bottom;
+  uint localBot = OrderAccess::load_acquire(&_bottom);
   uint n_elems = size(localBot, oldAge.top());
   if (n_elems == 0) {
     return false;
@@ -633,8 +633,8 @@
 
 template<class E, MEMFLAGS F, unsigned int N> inline bool
 GenericTaskQueue<E, F, N>::push(E t) {
-  uint localBot = _bottom;
-  assert((localBot >= 0) && (localBot < N), "_bottom out of range.");
+  uint localBot = OrderAccess::load_acquire(&_bottom);
+  assert(localBot < N, "_bottom out of range.");
   idx_t top = _age.top();
   uint dirty_n_elems = dirty_size(localBot, top);
   assert(dirty_n_elems < N, "n_elems out of range.");
@@ -651,7 +651,7 @@
 
 template<class E, MEMFLAGS F, unsigned int N> inline bool
 GenericTaskQueue<E, F, N>::pop_local(E& t) {
-  uint localBot = _bottom;
+  uint localBot = OrderAccess::load_acquire(&_bottom);
   // This value cannot be N-1.  That can only occur as a result of
   // the assignment to bottom in this method.  If it does, this method
   // resets the size to 0 before the next call (which is sequential,