From: Jakub Kicinski <kuba@kernel.org>
To: Jeongjun Park <aha310510@gmail.com>
Cc: davem@davemloft.net, edumazet@google.com, pabeni@redhat.com,
idosch@nvidia.com, jiri@resnulli.us, amcohen@nvidia.com,
liuhangbin@gmail.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
syzbot+b668da2bc4cb9670bf58@syzkaller.appspotmail.com
Subject: Re: [PATCH net] rtnetlink: fix possible deadlock in team_port_change_check
Date: Tue, 30 Jul 2024 16:59:12 -0700 [thread overview]
Message-ID: <20240730165912.67600510@kernel.org> (raw)
In-Reply-To: <20240730152210.25153-1-aha310510@gmail.com>
On Wed, 31 Jul 2024 00:22:10 +0900 Jeongjun Park wrote:
> do_setlink() changes the flag of the device and then enslaves it. However,
> in this case, if the IFF_UP flag is set, the enslavement process calls
> team_add_slave() to acquire 'team->lock', but when dev_open() opens the
> newly enslaved device, the NETDEV_UP event occurs, and as a result,
> a deadlock occurs when team_port_change_check() tries to acquire
> 'team->lock' again.
You can't change behavior like this, see ec4ffd100ffb396ec
--
pw-bot: reject
next prev parent reply other threads:[~2024-07-30 23:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-30 15:22 [PATCH net] rtnetlink: fix possible deadlock in team_port_change_check Jeongjun Park
2024-07-30 23:59 ` Jakub Kicinski [this message]
2024-07-31 1:37 ` Jeongjun Park
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