On Mon, Jul 4, 2016 at 7:50 PM, Matt Bennett
<Matt.Bennett@xxxxxxxxxxxxxxxxxxx> wrote:
> Using printk I have confirmed that ppp_pernet() is called from
> ppp_connect_channel() when the BUG occurs (i.e. pch->chan_net is NULL).
>
> This behavior appears to have been introduced in commit 1f461dc ("ppp:
> take reference on channels netns").
We have some race condition here, where a parallel ppp_unregister_channel()
could happen while we are in ppp_connect_channel().
We need some synchronization for them. I am not sure what is the right lock
here since ppp locking looks crazy.
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