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BUG: KCSAN: data-race in xfrm_lookup_with_ifid / xfrm_lookup_with_ifid

write to 0xffff888107d00108 of 8 bytes by task 6140 on cpu 1:
 xfrm_lookup_with_ifid+0xd06/0x1300 net/xfrm/xfrm_policy.c:3216
 xfrm_lookup net/xfrm/xfrm_policy.c:3268 [inline]
 xfrm_lookup_route+0x3b/0x100 net/xfrm/xfrm_policy.c:3279
 ip6_dst_lookup_flow+0x98/0xc0 net/ipv6/ip6_output.c:1246
 send6+0x238/0x3a0 drivers/net/wireguard/socket.c:139
 wg_socket_send_skb_to_peer+0xbd/0x130 drivers/net/wireguard/socket.c:178
 wg_socket_send_buffer_to_peer+0xd6/0x100 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x10c/0x150 drivers/net/wireguard/send.c:51
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2390
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

write to 0xffff888107d00108 of 8 bytes by task 3150 on cpu 0:
 xfrm_lookup_with_ifid+0xd06/0x1300 net/xfrm/xfrm_policy.c:3216
 xfrm_lookup net/xfrm/xfrm_policy.c:3268 [inline]
 xfrm_lookup_route+0x3b/0x100 net/xfrm/xfrm_policy.c:3279
 ip6_dst_lookup_flow+0x98/0xc0 net/ipv6/ip6_output.c:1246
 send6+0x238/0x3a0 drivers/net/wireguard/socket.c:139
 wg_socket_send_skb_to_peer+0xbd/0x130 drivers/net/wireguard/socket.c:178
 wg_socket_send_buffer_to_peer+0xd6/0x100 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x10c/0x150 drivers/net/wireguard/send.c:51
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2390
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x0000000064190279 -> 0x000000006419027b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3150 Comm: kworker/u4:6 Not tainted 6.3.0-rc3-syzkaller-00005-g7d31677bb7b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
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