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

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Date:   Tue, 27 Feb 2018 19:56:27 +0100
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>,
        netdev-owner@...r.kernel.org
Subject: Re: ppp/pppoe, still panic 4.15.3 in ppp_push

On Tue, Feb 27, 2018 at 12:58:55PM +0200, Denys Fedoryshchenko wrote:
> On 2018-02-23 12:07, Guillaume Nault wrote:
> > On Fri, Feb 23, 2018 at 11:41:43AM +0200, Denys Fedoryshchenko wrote:
> > > On 2018-02-23 11:38, Guillaume Nault wrote:
> > > > On Thu, Feb 22, 2018 at 08:51:19PM +0200, Denys Fedoryshchenko wrote:
> > > > > I'm using accel-ppp that has unit-cache option, i guess for
> > > > > "reusing" ppp
> > > > > interfaces (because creating a lot of interfaces on BRAS with 8k
> > > > > users quite
> > > > > expensive).
> > > > > Maybe it is somehow related and can be that scenario causing this bug?
> > > > >
> > > > Indeed, it'd be interesting to know if unit-cache is part of the
> > > > equation (if it's workable for you to disable it).
> > > Already did that and testing, unfortunately i had to disable KASAN
> > > and full
> > > refcount, as performance hit is too heavy for me. I will try to
> > > enable KASAN
> > > alone tomorrow.
> > > 
> > Don't hesitate to post the result even if you can't afford enabling
> > KASAN.
> Till now 4 days and no reboots.
> 
That unit-cache information was very useful. I can now reproduce the
issue and work on a fix.

Thanks Denys!