netdev - Re: [PATCH net] net, neigh: Do not trigger immediate probes on NUD_FAILED from neigh_managed

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Message-ID: <2aef3b34-26e6-67ea-296e-8c61d0934e76@iogearbox.net>
Date:   Wed, 2 Feb 2022 11:31:38 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     davem@...emloft.net
Cc:     kuba@...nel.org, roopa@...dia.com, edumazet@...gle.com,
        dsahern@...nel.org, john.fastabend@...il.com,
        netdev@...r.kernel.org,
        syzbot+5239d0e1778a500d477a@...kaller.appspotmail.com
Subject: Re: [PATCH net] net, neigh: Do not trigger immediate probes on
 NUD_FAILED from neigh_managed_work

On 2/1/22 8:39 PM, Daniel Borkmann wrote:
> syzkaller was able to trigger a deadlock for NTF_MANAGED entries [0]:
> 
[...]
> 
> Fixes: 7482e3841d52 ("net, neigh: Add NTF_MANAGED flag for managed neighbor entries")
> Reported-by: syzbot+5239d0e1778a500d477a@...kaller.appspotmail.com
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: David Ahern <dsahern@...nel.org>
> Cc: Roopa Prabhu <roopa@...dia.com>

Tested-by: syzbot+5239d0e1778a500d477a@...kaller.appspotmail.com