netdev - Re: Latest net-next from GIT panic

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Message-ID: <1505915099.29839.95.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 20 Sep 2017 06:44:59 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>
Cc:     Wei Wang <weiwan@...gle.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        edumazet@...gle.com
Subject: Re: Latest net-next from GIT panic

On Wed, 2017-09-20 at 15:39 +0200, Paweł Staszewski wrote:
> 
> W dniu 2017-09-20 o 15:34, Eric Dumazet pisze:
> > Could you try this debug patch ?
> >
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index f535779d9dc1dfe36934c2abba4e43d053ac5d6f..1eaa3553a724dc8c048f67b556337072d5addc82 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -3331,7 +3331,14 @@ void netdev_run_todo(void);
> >    */
> >   static inline void dev_put(struct net_device *dev)
> >   {
> > -	this_cpu_dec(*dev->pcpu_refcnt);
> > +	int __percpu *pref = READ_ONCE(dev->pcpu_refcnt);
> > +
> > +	if (!pref) {
> > +		pr_err("no pcpu_refcnt on dev %p(%s) state %d dismantle %d\n",
> > +		       dev, dev->name, dev->reg_state, dev->dismantle);
> > +		BUG();
> > +	}
> > +	this_cpu_dec(*pref);
> >   }
> >   
> >   /**
> >
> >
> >
> 
> You want me to add this patch to what kernel version ?
> currently im after git bisect reset - so mainline stable
> 

Simply us the latest net-next as mentioned in the thread title, thanks.