netdev - Re: [net] udp: exclude UDP_ENCAP_RXRPC packets from early demux

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Date:   Fri, 29 Jan 2021 17:25:04 +0000
From:   Vadim Fedorenko <vfedorenko@...ek.ru>
To:     Jakub Kicinski <kuba@...nel.org>, David Ahern <dsahern@...nel.org>,
        David Howells <dhowells@...hat.com>
Cc:     linux-afs@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [net] udp: exclude UDP_ENCAP_RXRPC packets from early demux

On 29.01.2021 14:25, Vadim Fedorenko wrote:
> While adding the early demux for udp sockets rxrpc were not
> changed to deal with sk_rx_dst cache. That leads to leaking early
> demux cache dst reference. But adding dst_release to destructor of
> rxrpc doesn't help in situation of destroying namespace. This is
> because rxrpc does not register any netdevices per namespace.
> Assigned sk->sk_rx_dst holds the reference to netdevice preventing
> successful freeing of netdevices in namespace and moving forward to
> subsystem freeing. This is dead lock situation.
> 
> Removing rxrpc sockets from early demux util the solution in rxrpc
> subsystem is made.

Skip this please, as David Howells sent corrections to rxrpc