netdev - Re: ppp/pppoe, still panic 4.15.3 in ppp

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Message-ID: <20180214160739.GF1422@alphalink.fr>
Date:   Wed, 14 Feb 2018 17:07:39 +0100
From:   Guillaume Nault <g.nault@...halink.fr>
To:     Denys Fedoryshchenko <nuclearcat@...learcat.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: ppp/pppoe, still panic 4.15.3 in ppp_push

On Wed, Feb 14, 2018 at 03:17:23PM +0200, Denys Fedoryshchenko wrote:
> Hi,
> 
> Upgraded kernel to 4.15.3, still it crashes after while (several hours,
> cannot do bisect, as it is production server).
> 
> dev ppp # gdb ppp_generic.o
> GNU gdb (Gentoo 7.12.1 vanilla) 7.12.1
> <<skipped>>
> Reading symbols from ppp_generic.o...done.
> (gdb) list *ppp_push+0x73
> 0x681 is in ppp_push (drivers/net/ppp/ppp_generic.c:1663).
> 1658			list = list->next;
> 1659			pch = list_entry(list, struct channel, clist);
> 1660
> 1661			spin_lock(&pch->downl);
> 1662			if (pch->chan) {
> 1663				if (pch->chan->ops->start_xmit(pch->chan, skb))
> 1664					ppp->xmit_pending = NULL;
> 1665			} else {
> 1666				/* channel got unregistered */
> 1667				kfree_skb(skb);
> 
> 
I expect a memory corruption. Do you have the possibility to run with
KASAN by any chance?