netdev - Re: Latest net-next from GIT panic

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Message-ID: <CAM_iQpV8qV8a_yFT0--4Z==FuWda=4EQzKJzHTL+op4S5b9E0A@mail.gmail.com>
Date:   Wed, 20 Sep 2017 10:50:21 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Eric Dumazet <eric.dumazet@...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, 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.