netdev - Re: [OOPS] In __netif_receive_skb

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Message-ID: <CAO7SqHBM2QtYHPP9Yp=aUwOqR_tDPH4LOSey-+=oPbsD_huFLw@mail.gmail.com>
Date:	Tue, 12 Jan 2016 10:15:17 -0800
From:	Salam Noureddine <noureddine@...sta.com>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Pali Rohár <pali.rohar@...il.com>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Sebastian Reichel <sre@...nel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [OOPS] In __netif_receive_skb_core

On Mon, Jan 11, 2016 at 11:16 PM, Ivaylo Dimitrov
<ivo.g.dimitrov.75@...il.com> wrote:

>>> On Mon, 2016-01-11 at 17:19 -0800, Salam Noureddine wrote:
>>>>
>>>> It must be that skb->dev was changed to NULL inside of
>>>> __netif_receive_skb_core, otherwise we would have crashed much
>>>> earlier. Also, orig_dev is saved at the beginning. Possibly a device
>>>> is layered on top of the original device.
>
>
> Exactly (skb->dev was changed to NULL ...). Do you think it makes sense to
> put printks in various places in __netif_receive_skb_core to see after which
> function call skb->dev turns into NULL?
>

No need anymore since Eric found the culprit in phonet_rcv.
Thanks for your help debugging this!

Salam