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BUG: KCSAN: data-race in __neigh_event_send / ip6_dst_lookup_tail

write to 0xffff888139bede84 of 1 bytes by task 15487 on cpu 1:
 __neigh_event_send+0x415/0xbd0
 neigh_resolve_output+0x114/0x430
 ip6_finish_output2+0x9bc/0xc50
 ip6_finish_output+0x39a/0x4e0
 ip6_output+0xeb/0x220
 ip6_local_out+0x64/0x80
 udp_tunnel6_xmit_skb+0x333/0x4c0
 send6+0x2ea/0x3a0
 wg_socket_send_skb_to_peer+0xbd/0x130
 wg_socket_send_buffer_to_peer+0xd6/0x100
 wg_packet_handshake_send_worker+0x10c/0x150
 process_one_work+0x3e6/0x750
 worker_thread+0x5ef/0xa10
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

read to 0xffff888139bede84 of 1 bytes by task 8 on cpu 0:
 ip6_dst_lookup_tail+0x747/0x930
 ip6_dst_lookup_flow+0x48/0xc0
 send6+0x238/0x3a0
 wg_socket_send_skb_to_peer+0xbd/0x130
 wg_socket_send_buffer_to_peer+0xd6/0x100
 wg_packet_handshake_send_worker+0x10c/0x150
 process_one_work+0x3e6/0x750
 worker_thread+0x5ef/0xa10
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

value changed: 0x20 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 6.2.0-rc7-syzkaller-00018-g0983f6bf2bfc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
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