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In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 02/02/2025 23:56, Sabrina Dubroca wrote: > 2025-01-13, 10:31:24 +0100, Antonio Quartulli wrote: >> +static int ovpn_peer_del_p2p(struct ovpn_peer *peer, >> + enum ovpn_del_peer_reason reason) >> +{ >> + struct ovpn_peer *tmp; >> + >> + lockdep_assert_held(&peer->ovpn->lock); >> + >> + tmp = rcu_dereference_protected(peer->ovpn->peer, >> + lockdep_is_held(&peer->ovpn->lock)); >> + if (tmp != peer) { >> + DEBUG_NET_WARN_ON_ONCE(1); > > I think this WARN should be removed. If 2 almost-simultanenous > DEL_PEER manage to fetch the peer, the first will delete it and NULL > peer->ovpn->peer, then when it releases ovpn->lock, the 2nd will find > NULL != peer and hit this WARN. > > (probably not happening in practical cases, but syzbot will manage to > hit it) I can see this happening with two almost-simultaneous netlink PEER_DEL calls. Thanks, will get rid of the warning. Regards, > >> + return -ENOENT; >> + } >> + >> + ovpn_peer_remove(peer, reason); >> + >> + return 0; >> +} > -- Antonio Quartulli OpenVPN Inc.