On Sun, Oct 13, 2019 at 10:37 PM Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote: > Infinite loop because tcf_add_notify() returns -EAGAIN as the message can not be delivered to the socket, > since its SO_RCVBUF has been set to 0. Interesting corner case... > > Perhaps we need this patch ? This patch looks reasonable to me, as the -EAGAIN here is mainly (if not totally) for the locking retry logic. Thanks.