netdev - Re: Latest net-next from GIT panic

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Message-ID: <1505930347.29839.104.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 20 Sep 2017 10:59:07 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Paweł Staszewski <pstaszewski@...are.pl>,
        Wei Wang <weiwan@...gle.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: Latest net-next from GIT panic

On Wed, 2017-09-20 at 10:50 -0700, Cong Wang wrote:
> On Wed, Sep 20, 2017 at 6:11 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > Sorry for top-posting, but this is to give context to Wei, since Pawel
> > used a top posting way to report his bisection.
> >
> > Wei, can you take a look at Pawel report ?
> >
> > Crash happens in dst_destroy() at following :
> >
> > if (dst->dev)
> >      dev_put(dst->dev); <<CRASH>>
> >
> >
> > dst->dev is not NULL, but netdev->pcpu_refcnt is NULL
> >
> > 65 ff 08                decl   %gs:(%rax)   // CRASH since rax = NULL
> >
> >
> >
> > Pawel, please share your netdevices and routing setup  ?
> 
> Looks like a double dev_put() on some dev...
> 
> Pawel, do you have any idea how this is triggered? Does your
> test try to remove some network device? If so which one?
> I noticed you have at least multiple vlan, bond and ixgbe
> devices.

Or a missing dev_hold() somewhere.