netdev - Re: 4.6.3, pppoe + shaper workload, skb_panic / skb_push / ppp_start

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Message-ID: <20160808210541.GI3031@alphalink.fr>
Date:	Mon, 8 Aug 2016 23:05:41 +0200
From:	Guillaume Nault <g.nault@...halink.fr>
To:	Denys Fedoryshchenko <nuclearcat@...learcat.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: 4.6.3, pppoe + shaper workload, skb_panic / skb_push /
 ppp_start_xmit

On Mon, Aug 08, 2016 at 02:25:00PM +0300, Denys Fedoryshchenko wrote:
> On 2016-08-01 23:59, Guillaume Nault wrote:
> > Do you still have the vmlinux file with debug symbols that generated
> > this panic?
> Sorry for delay, i didn't had same image on all servers and probably i found
> cause of panic, but still testing on several servers.
> If i remove SFQ qdisc from ppp shapers, servers not rebooting anymore.
> 
Thanks for the feedback. I wonder which interactions between SFQ and
PPP can lead to this problem. I'll take a look.

> But still i need around 2 days to make sure that's the reason.
> 
Okay, just let me know if you can confirm that removing SFQ really
solves the problem.