syzbot

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BUG: KCSAN: data-race in __dev_change_flags / is_ndev_for_default_gid_filter

read-write to 0xffff8881398580c0 of 4 bytes by task 8619 on cpu 1:
 __dev_change_flags+0x9e/0x3f0 net/core/dev.c:8517
 dev_change_flags+0x55/0xc0 net/core/dev.c:8614
 do_setlink+0x9a5/0x2210 net/core/rtnetlink.c:2788
 __rtnl_newlink net/core/rtnetlink.c:3547 [inline]
 rtnl_newlink+0x114c/0x16a0 net/core/rtnetlink.c:3594
 rtnetlink_rcv_msg+0x811/0x8d0 net/core/rtnetlink.c:6091
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2540
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6109
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x666/0x760 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmsg+0x19a/0x230 net/socket.c:2565
 __do_sys_sendmsg net/socket.c:2574 [inline]
 __se_sys_sendmsg net/socket.c:2572 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2572
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881398580c0 of 4 bytes by task 8555 on cpu 0:
 netif_is_bond_master include/linux/netdevice.h:4990 [inline]
 is_ndev_for_default_gid_filter+0x33/0x130 drivers/infiniband/core/roce_gid_mgmt.c:220
 ib_enum_roce_netdev+0x12e/0x1e0 drivers/infiniband/core/device.c:2303
 ib_enum_all_roce_netdevs+0xa4/0x110 drivers/infiniband/core/device.c:2332
 netdevice_event_work_handler+0x157/0x3c0 drivers/infiniband/core/roce_gid_mgmt.c:627
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

value changed: 0x00000002 -> 0x00000123

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8555 Comm: kworker/u4:1 Not tainted 6.1.0-rc7-syzkaller-00190-g97ee9d1c1696-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: gid-cache-wq netdevice_event_work_handler
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