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An exiting task or process which didn't do I/O yet have no io context, elv_unregister() should check it is not NULL. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Jens Axboe <axboe@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>