netdev - RE: [PATCH net-next] sit: proper dev_{hold|put} in ndo

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Date:   Wed, 31 Mar 2021 00:05:45 +0000
From:   "Wong, Vee Khee" <vee.khee.wong@...el.com>
To:     "eric.dumazet@...il.com" <eric.dumazet@...il.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>,
        "Ismail, Mohammad Athari" <mohammad.athari.ismail@...el.com>
Subject: RE: [PATCH net-next] sit: proper dev_{hold|put} in ndo_[un]init
 methods

Hi all,

This patch introduced the following massive warnings printouts on a
Intel x86 Alderlake platform with STMMAC MAC and Marvell 88E2110 PHY.

[  149.674232] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  159.930310] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  170.186205] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  180.434311] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  190.682309] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  200.690176] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  210.938310] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  221.186311] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  231.442311] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  241.690186] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  251.698288] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  261.946311] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  272.194181] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  282.442311] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  292.690310] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  302.938313] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  313.186255] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  323.442329] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  333.698309] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  343.946310] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  354.202166] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  364.450190] unregister_netdevice: waiting for sit0 to become free. Usage count = 2
[  374.706314] unregister_netdevice: waiting for sit0 to become free. Usage count = 2

Is this an expected behavior?

Thanks,
VK