syzbot

==================================================================
BUG: KCSAN: data-race in is_eth_port_of_netdev_filter / team_port_del

write to 0xffff88810eb070c4 of 4 bytes by task 24 on cpu 0:
 team_upper_dev_unlink drivers/net/team/team.c:1124 [inline]
 team_port_del+0x226/0x680 drivers/net/team/team.c:1343
 team_del_slave drivers/net/team/team.c:1982 [inline]
 team_device_event+0x15b/0x2c0 drivers/net/team/team.c:3004
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x53/0xb0 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2075 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2087 [inline]
 call_netdevice_notifiers net/core/dev.c:2101 [inline]
 unregister_netdevice_many+0x867/0xf70 net/core/dev.c:10935
 default_device_exit_batch+0x237/0x260 net/core/dev.c:11455
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x4dc/0x900 net/core/net_namespace.c:595
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88810eb070c4 of 4 bytes by task 2976 on cpu 1:
 is_vlan_dev include/linux/if_vlan.h:74 [inline]
 rdma_vlan_dev_real_dev include/rdma/ib_addr.h:267 [inline]
 is_eth_port_of_netdev_filter+0x29/0x1a0 drivers/infiniband/core/roce_gid_mgmt.c:157
 ib_enum_roce_netdev+0x292/0x310 drivers/infiniband/core/device.c:2301
 ib_enum_all_roce_netdevs+0x94/0x100 drivers/infiniband/core/device.c:2330
 netdevice_event_work_handler+0xf8/0x200 drivers/infiniband/core/roce_gid_mgmt.c:626
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2976 Comm: kworker/u4:4 Tainted: G        W         5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: gid-cache-wq netdevice_event_work_handler
==================================================================
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50