netdev - Re: NEIGH: BUG, double timer add, state is 8

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Date:   Wed, 10 Jul 2019 16:18:49 -0600
From:   David Ahern <dsahern@...il.com>
To:     Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Cc:     Marek Majkowski <marek@...udflare.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        kernel-team <kernel-team@...udflare.com>
Subject: Re: NEIGH: BUG, double timer add, state is 8

On 7/5/19 11:30 AM, Lorenzo Bianconi wrote:
> looking at the reproducer it seems to me the issue is due to the use of
> 'NTF_USE' from userspace.
> Should we unschedule the neigh timer if we are in IN_TIMER receiving this
> flag from userspace? (taking appropriate locking)

I think you are right. Do you want to send a patch?