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BUG: KCSAN: data-race in dev_get_tstats64 / iptunnel_xmit

read-write to 0xffffe8ffffc46130 of 8 bytes by task 1907 on cpu 0:
 iptunnel_xmit_stats include/net/ip_tunnels.h:460 [inline]
 iptunnel_xmit+0x3ce/0x490 net/ipv4/ip_tunnel_core.c:87
 udp_tunnel_xmit_skb+0x15d/0x170 net/ipv4/udp_tunnel_core.c:171
 send4+0x439/0x500 drivers/net/wireguard/socket.c:85
 wg_socket_send_skb_to_peer+0x92/0x120 drivers/net/wireguard/socket.c:175
 wg_socket_send_buffer_to_peer+0xd2/0xf0 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_response+0xdf/0x110 drivers/net/wireguard/send.c:103
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:161 [inline]
 wg_packet_handshake_receive_worker+0x3c8/0x6a0 drivers/net/wireguard/receive.c:220
 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

read to 0xffffe8ffffc46130 of 8 bytes by task 1844 on cpu 1:
 dev_fetch_sw_netstats net/core/dev.c:10390 [inline]
 dev_get_tstats64+0x138/0x1e0 net/core/dev.c:10413
 dev_get_stats+0x69/0x240 net/core/dev.c:10344
 rtnl_fill_stats+0x45/0x320 net/core/rtnetlink.c:1203
 rtnl_fill_ifinfo+0xc19/0x1050 net/core/rtnetlink.c:1778
 rtmsg_ifinfo_build_skb+0xa2/0x130 net/core/rtnetlink.c:3848
 rtmsg_ifinfo_event net/core/rtnetlink.c:3880 [inline]
 rtmsg_ifinfo+0x55/0xc0 net/core/rtnetlink.c:3889
 __dev_notify_flags+0x65/0x3a0 net/core/dev.c:8467
 dev_change_flags+0xa2/0xc0 net/core/dev.c:8509
 do_setlink+0x7f9/0x2120 net/core/rtnetlink.c:2731
 __rtnl_newlink net/core/rtnetlink.c:3416 [inline]
 rtnl_newlink+0x1116/0x1580 net/core/rtnetlink.c:3531
 rtnetlink_rcv_msg+0x74f/0x7e0 net/core/rtnetlink.c:5993
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2503
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6011
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x661/0x750 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 __sys_sendto+0x21e/0x2c0 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:2048
 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+0x44/0xae

value changed: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1844 Comm: syz-executor.4 Not tainted 5.18.0-rc4-syzkaller-00006-gd615b5416f8a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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