nt dfc428b656c4693a2334a8d9865b430beddb562a author Oleg Nesterov 1312413665 -0700 committer Linus Torvalds 1312417520 -1000 taskstats: add_del_listener() should ignore !valid listeners When send_cpu_listeners() finds the orphaned listener it marks it as !valid and drops listeners->sem. Before it takes this sem for writing, s->pid can be reused and add_del_listener() can wrongly try to re-use this entry. Change add_del_listener() to check ->valid = T. Signed-off-by: Oleg Nesterov Reviewed-by: Vasiliy Kulikov Acked-by: Balbir Singh Cc: Jerome Marchand Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds )Jx