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BUG: KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb

read-write to 0xffff8881394c6158 of 8 bytes by task 3150 on cpu 0:
 udp_tunnel6_xmit_skb+0x44d/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-write to 0xffff8881394c6158 of 8 bytes by task 7143 on cpu 1:
 udp_tunnel6_xmit_skb+0x44d/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

value changed: 0x0000000000000156 -> 0x0000000000000157

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7143 Comm: kworker/u4:3 Tainted: G        W          6.2.0-rc7-syzkaller-00011-g05ecb680708a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
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