On Mon, 2017-10-23 at 08:02 -0700, Eric Dumazet wrote: > From: Eric Dumazet <eduma...@google.com> > > In my first attempt to fix the lockdep splat, I forgot we could > enter inet_csk_route_req() with a freshly allocated request socket, > for which refcount has not yet been elevated, due to complex > SLAB_TYPESAFE_BY_RCU rules. > > We either are in rcu_read_lock() section _or_ we own a refcount on the > request. > > Correct RCU verb to use here is rcu_dereference_check(), although it is > not possible to prove we actually own a reference on a shared > refcount :/
David, please hold on this patch, I will squash another fixes, since we need the same in two other places (tcp_v4_send_synack() & dccp_v4_send_response())
