netdev - Re: bond: take rcu lock in bond_poll

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Message-ID: <CAM_iQpVw2kOtWdup9Q-c0wxsNCx-PtSMPhKkQ15R=8nwiJmhfQ@mail.gmail.com>
Date:   Tue, 25 Sep 2018 14:18:19 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Dave Jones <davej@...emonkey.org.uk>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: bond: take rcu lock in bond_poll_controller

On Mon, Sep 24, 2018 at 1:08 PM Dave Jones <davej@...emonkey.org.uk> wrote:
>
> Callers of bond_for_each_slave_rcu are expected to hold the rcu lock,
> otherwise a trace like below is shown

Interesting, netpoll_send_skb_on_dev() already assumes RCU read lock
when it calls rcu_dereference_bh()...

I wonder how it can't catch such a warning before the one you reported.