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linux/drivers/net/team
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Tetsuo Handa bce42728ac team: avoid NETDEV_CHANGEMTU event when unregistering slave 
[ Upstream commit bb4c698633 ]

syzbot is reporting

  unregister_netdevice: waiting for netdevsim0 to become free. Usage count = 3
  ref_tracker: netdev@ffff88807dcf8618 has 1/2 users at
       __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
       netdev_hold include/linux/netdevice.h:4429 [inline]
       inetdev_init+0x201/0x4e0 net/ipv4/devinet.c:286
       inetdev_event+0x251/0x1610 net/ipv4/devinet.c:1600
       notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
       call_netdevice_notifiers_mtu net/core/dev.c:2318 [inline]
       netif_set_mtu_ext+0x5aa/0x800 net/core/dev.c:9886
       netif_set_mtu+0xd7/0x1b0 net/core/dev.c:9907
       dev_set_mtu+0x126/0x260 net/core/dev_api.c:248
       team_port_del+0xb07/0xcb0 drivers/net/team/team_core.c:1333
       team_del_slave drivers/net/team/team_core.c:1936 [inline]
       team_device_event+0x207/0x5b0 drivers/net/team/team_core.c:2929
       notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
       call_netdevice_notifiers_extack net/core/dev.c:2281 [inline]
       call_netdevice_notifiers net/core/dev.c:2295 [inline]
       __dev_change_net_namespace+0xcb7/0x2050 net/core/dev.c:12592
       do_setlink+0x2ce/0x4590 net/core/rtnetlink.c:3060
       rtnl_changelink net/core/rtnetlink.c:3776 [inline]
       __rtnl_newlink net/core/rtnetlink.c:3935 [inline]
       rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072
       rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958
       netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
       netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
       netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
       netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894

problem. Ido Schimmel found steps to reproduce

  ip link add name team1 type team
  ip link add name dummy1 mtu 1499 master team1 type dummy
  ip netns add ns1
  ip link set dev dummy1 netns ns1
  ip -n ns1 link del dev dummy1

and also found that the same issue was fixed in the bond driver in
commit f51048c3e0 ("bonding: avoid NETDEV_CHANGEMTU event when
unregistering slave").

Let's do similar thing for the team driver, with commit ad7c7b2172 ("net:
hold netdev instance lock during sysfs operations") and commit 303a8487a6
("net: s/__dev_set_mtu/__netif_set_mtu/") also applied.

Reported-by: syzbot+881d65229ca4f9ae8c84@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=881d65229ca4f9ae8c84
Suggested-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Fixes: 3d249d4ca7 ("net: introduce ethernet teaming device")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260224125709.317574-2-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:20:51 -05:00
..
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile net: team: use policy generated by YAML spec 2024-04-02 18:24:32 -07:00
team_core.c team: avoid NETDEV_CHANGEMTU event when unregistering slave 2026-03-04 07:20:51 -05:00
team_mode_activebackup.c team: replace team lock with rtnl lock 2025-06-25 15:23:06 -07:00
team_mode_broadcast.c team: remove unreferenced header in broadcast and roundrobin files 2023-08-08 15:04:04 -07:00
team_mode_loadbalance.c team: replace team lock with rtnl lock 2025-06-25 15:23:06 -07:00
team_mode_random.c treewide: use get_random_u32_below() instead of deprecated function 2022-11-18 02:15:15 +01:00
team_mode_roundrobin.c team: remove unreferenced header in broadcast and roundrobin files 2023-08-08 15:04:04 -07:00
team_nl.c net: team: use policy generated by YAML spec 2024-04-02 18:24:32 -07:00
team_nl.h net: team: use policy generated by YAML spec 2024-04-02 18:24:32 -07:00