de_thread() checks if the old leader was the ->child_reaper, this is not
possible any longer. With the previous patch ->group_leader itself will
change ->child_reaper on exit.

From now find_new_reaper() is the only function (apart from initialization)
which plays with ->child_reaper.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- 2.6.27-rc4/fs/exec.c~3_EXEC	2008-07-30 13:12:47.000000000 +0400
+++ 2.6.27-rc4/fs/exec.c	2008-08-24 19:20:05.000000000 +0400
@@ -825,8 +825,6 @@ static int de_thread(struct task_struct 
 			schedule();
 		}
 
-		if (unlikely(task_child_reaper(tsk) == leader))
-			task_active_pid_ns(tsk)->child_reaper = tsk;
 		/*
 		 * The only record we have of the real-time age of a
 		 * process, regardless of execs it's done, is start_time.

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