netdev - Re: [PATCH net-next] netlink: correct nlmsg size for multicast notifications

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Message-ID: <CANn89iJEz=HWXN9fV4iLX6uGumBuOvcup6pEJvPWs3efy4=4OA@mail.gmail.com>
Date: Thu, 19 Dec 2024 16:53:31 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Yuyang Huang <yuyanghuang@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>, 
	roopa@...ulusnetworks.com, jiri@...nulli.us, stephen@...workplumber.org, 
	jimictw@...gle.com, prohr@...gle.com, liuhangbin@...il.com, 
	nicolas.dichtel@...nd.com, andrew@...n.ch, pruddy@...tta.att-mail.com, 
	netdev@...r.kernel.org, Maciej Żenczykowski <maze@...gle.com>, 
	Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: [PATCH net-next] netlink: correct nlmsg size for multicast notifications

On Thu, Dec 19, 2024 at 4:35 PM Yuyang Huang <yuyanghuang@...gle.com> wrote:
>
> >Same remark for inet_ifmcaddr_notify()
>
> Moreover, for both IPv4 and IPv6, when a device is up, the kernel
> joins the all-hosts multicast addresses (224.0.0.1/ff02::1). I guess
> this logic also does not run in process context?
>

Hopefully all these paths are stressed in kselftest.

A wrong gfp would trigger issues when you run the selftests before
submission, or in netdev CI.