syzbot

==================================================================
BUG: KCSAN: data-race in bond_enslave / is_ndev_for_default_gid_filter

read-write to 0xffff88801371a228 of 4 bytes by task 32691 on cpu 0:
 bond_enslave+0x9e7/0x2b80 drivers/net/bonding/bond_main.c:1750
 do_set_master net/core/rtnetlink.c:2517 [inline]
 do_setlink+0x871/0x21d0 net/core/rtnetlink.c:2713
 __rtnl_newlink net/core/rtnetlink.c:3374 [inline]
 rtnl_newlink+0xec9/0x13a0 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x723/0x7c0 net/core/rtnetlink.c:5562
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2494
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:5580
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x5df/0x6b0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x6f8/0x7c0 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 __sys_sendto+0x2ae/0x380 net/socket.c:1992
 __do_sys_sendto net/socket.c:2004 [inline]
 __se_sys_sendto net/socket.c:2000 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2000
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801371a228 of 4 bytes by task 29032 on cpu 1:
 netif_is_bond_master include/linux/netdevice.h:4888 [inline]
 is_ndev_for_default_gid_filter+0x33/0x130 drivers/infiniband/core/roce_gid_mgmt.c:219
 ib_enum_roce_netdev+0x292/0x310 drivers/infiniband/core/device.c:2263
 ib_enum_all_roce_netdevs+0x94/0x100 drivers/infiniband/core/device.c:2292
 netdevice_event_work_handler+0xf8/0x200 drivers/infiniband/core/roce_gid_mgmt.c:626
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 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: 29032 Comm: kworker/u4:6 Not tainted 5.10.0-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
==================================================================