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find_task_by_vpid() is not safe without rcu_read_lock(). 2.6.33-rc7 got RCU protection for sys_setpriority() but missed it for sys_getpriority(). Signed-off-by: Tetsuo Handa <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: "Paul E. McKenney" <[email protected]> Acked-by: Serge Hallyn <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>