linux-kernel - Re: [syzbot] [net?] INFO: task hung in nsim

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Message-ID: <20240724195822.6f0388f1@kernel.org>
Date: Wed, 24 Jul 2024 19:58:22 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: syzbot <syzbot+90fd70a665715bd10258@...kaller.appspotmail.com>,
 davem@...emloft.net, linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] INFO: task hung in nsim_create (2)

On Wed, 24 Jul 2024 20:28:09 +0200 Eric Dumazet wrote:
> The fact that netdevsim uses a sysfs file to add/delete netdevice
> seems unfortunate,

Let me not point fingers but agreed, and the original implementation
didn't :)

> because of the classical sysfs vs rtnl issue (see rtnl_trylock() calls
> in net/core/net-sysfs.c for reference)

Is that any different than binding a physical device via sysfs?
Modules have "bind" and "unbind" files, which lead to probe/remove
AFAIU completely inline.