On Mon, Oct 05, 2015 at 02:08:44PM +0200, Guillaume Nault wrote:
>       if (po) {
>               struct sock *sk = sk_pppox(po);
>  
> -             bh_lock_sock(sk);
> -
> -             /* If the user has locked the socket, just ignore
> -              * the packet.  With the way two rcv protocols hook into
> -              * one socket family type, we cannot (easily) distinguish
> -              * what kind of SKB it is during backlog rcv.
> -              */
> -             if (sock_owned_by_user(sk) == 0) {
> -                     /* We're no longer connect at the PPPOE layer,
> -                      * and must wait for ppp channel to disconnect us.
> -                      */
> -                     sk->sk_state = PPPOX_ZOMBIE;
> -             }
> -
> -             bh_unlock_sock(sk);
>               if (!schedule_work(&po->proto.pppoe.padt_work))
>                       sock_put(sk);
>       }
> 
Finally, I think I'll keep this approach for net-next, to completely
remove PPPOX_ZOMBIE.
For now, let's just avoid any assumption about the relationship between
the PPPOX_ZOMBIE state and the value of po->pppoe_dev, as suggested by
Matt.

Denys, can you let me know if your issue goes away with the following
patch?
---
diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
index 2ed7506..5e0b432 100644
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -589,7 +589,7 @@ static int pppoe_release(struct socket *sock)
 
        po = pppox_sk(sk);
 
-       if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
+       if (po->pppoe_dev) {
                dev_put(po->pppoe_dev);
                po->pppoe_dev = NULL;
        }
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