syzbot

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BUG: KCSAN: data-race in __dev_change_flags / is_ndev_for_default_gid_filter

read-write to 0xffff88813b4d80b0 of 4 bytes by task 8369 on cpu 0:
 __dev_change_flags+0x9a/0x410 net/core/dev.c:8660
 rtnl_configure_link net/core/rtnetlink.c:3305 [inline]
 rtnl_newlink_create net/core/rtnetlink.c:3502 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3714 [inline]
 rtnl_newlink+0x121e/0x1690 net/core/rtnetlink.c:3727
 rtnetlink_rcv_msg+0x82e/0x8e0 net/core/rtnetlink.c:6595
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2559
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6613
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x58d/0x660 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x5d3/0x6e0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:745
 ____sys_sendmsg+0x312/0x410 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x280 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

read to 0xffff88813b4d80b0 of 4 bytes by task 35 on cpu 1:
 netif_is_bond_master include/linux/netdevice.h:5041 [inline]
 is_ndev_for_default_gid_filter+0x37/0x130 drivers/infiniband/core/roce_gid_mgmt.c:220
 ib_enum_roce_netdev+0x124/0x1d0 drivers/infiniband/core/device.c:2312
 ib_enum_all_roce_netdevs+0x8a/0x100 drivers/infiniband/core/device.c:2341
 netdevice_event_work_handler+0x15b/0x3c0 drivers/infiniband/core/roce_gid_mgmt.c:627
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335
 worker_thread+0x526/0x730 kernel/workqueue.c:3416
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

value changed: 0x00001002 -> 0x00001086

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 35 Comm: kworker/u8:2 Tainted: G        W          6.9.0-rc3-syzkaller-00011-g20cb38a7af88 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: gid-cache-wq netdevice_event_work_handler
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