syzbot

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

read-write to 0xffff88813b9a922c of 4 bytes by task 3073 on cpu 0:
 team_upper_dev_unlink drivers/net/team/team.c:1124 [inline]
 team_port_del+0x238/0x870 drivers/net/team/team.c:1343
 team_del_slave drivers/net/team/team.c:1982 [inline]
 team_device_event+0x161/0x500 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:2040 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 rollback_registered_many+0x876/0xe40 net/core/dev.c:9495
 unregister_netdevice_many net/core/dev.c:10735 [inline]
 default_device_exit_batch+0x250/0x3d0 net/core/dev.c:11218
 ops_exit_list net/core/net_namespace.c:190 [inline]
 cleanup_net+0x4cc/0x8e0 net/core/net_namespace.c:604
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x64a/0xaa0 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88813b9a922c of 4 bytes by task 24 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:2287
 ib_enum_all_roce_netdevs+0x94/0x100 drivers/infiniband/core/device.c:2316
 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+0x64a/0xaa0 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24 Comm: kworker/u4:1 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: gid-cache-wq netdevice_event_work_handler
==================================================================