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From: Jakub Kicinski <kuba@kernel.org>
To: Stanislav Fomichev <stfomichev@gmail.com>
Cc: syzbot <syzbot+b8c48ea38ca27d150063@syzkaller.appspotmail.com>,
	davem@davemloft.net, edumazet@google.com, horms@kernel.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	pabeni@redhat.com, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [net?] WARNING in __linkwatch_sync_dev (2)
Date: Fri, 13 Jun 2025 16:56:36 -0700	[thread overview]
Message-ID: <20250613165636.2fcdffa9@kernel.org> (raw)
In-Reply-To: <aEt6LvBMwUMxmUyx@mini-arch>

On Thu, 12 Jun 2025 18:09:02 -0700 Stanislav Fomichev wrote:
> Where linkwatch_do_dev (potentially called from ethtool_op_get_link and
> bond_check_dev_link) might trigger ipv6 address assignment so I'm not
> sure how this all supposed to work under rcu and without rtnl lock.

Yeah, linkwatch seems to also try to allocate memory with GFP_KERNEL.

> Tentatively (untested uncompiled):

I think miimon recheck period may be rather frequent, but given 
the above going back to rtnl is probably the sanest way out.

  reply	other threads:[~2025-06-13 23:56 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-06-12  2:21 [syzbot] [net?] WARNING in __linkwatch_sync_dev (2) syzbot
2025-06-13  1:09 ` Stanislav Fomichev
2025-06-13 23:56   ` Jakub Kicinski [this message]
2025-06-13 20:30 ` syzbot
2025-06-16 15:54   ` Stanislav Fomichev
2025-06-16 16:07     ` syzbot
2025-08-02 23:09   ` Hillf Danton
2025-08-02 23:28     ` syzbot
2025-08-02 15:01 ` syzbot

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