2.6.25.2

 kernel

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2727f92..6d8de05 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1722,7 +1722,12 @@ void cgroup_enable_task_cg_lists(void)
    use_task_css_set_links = 1;
    do_each_thread(g, p) {
       task_lock(p);
-      if (list_empty(&p->cg_list))
+      /*
+       * We should check if the process is exiting, otherwise
+       * it will race with cgroup_exit() in that the list
+       * entry won't be deleted though the process has exited.
+       */
+      if (!(p->flags & PF_EXITING) && list_empty(&p->cg_list))
          list_add(&p->cg_list, &p->cgroups->tasks);
       task_unlock(p);
    } while_each_thread(g, p);