netdev - Re: kernel panic in latest vanilla stable, while using nameif with "alive" pppoe interfaces

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Date:	Tue, 20 Oct 2009 07:05:28 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Michal Ostrowski <mostrows@...il.com>,
	Denys Fedoryschenko <denys@...p.net.lb>,
	netdev <netdev@...r.kernel.org>, linux-ppp@...r.kernel.org,
	paulus@...ba.org, mostrows@...thlink.net
Subject: Re: kernel panic in latest vanilla stable, while using nameif with
 "alive" pppoe interfaces

Cyrill Gorcunov a écrit :
> On 10/20/09, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> Michal Ostrowski a écrit :
>>> Access of po->pppoe_dev is guarded by sk->sk_state & PPPOX_CONNECTED,
>>> and all use cases now rely on the socket lock.  Because of this, the
>>> ref-count on the namespace held by the socket object suffices to hold
>>> the namespace in existence and so we don't need to ref-count the
>>> namespace in PPPoE. The flush_lock is gone.
>>>
>> Seems good !
>>
>> But can we use lock_sock() in __pppoe_xmit() context ?
>>
> 
> Eric, most probably i miss something, but how lock sock protect us
> from mtu changed via sysfs. This action calls change mtu notifier
> which doesn't care about sockets at all...

This ultimately calls pppoe_flush_dev() and this function
takes care of taking appropriate sock_locks() on each sockets ?
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