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BUG: KCSAN: data-race in xfrm_lookup_with_ifid / xfrm_lookup_with_ifid

write to 0xffff88813dc9a908 of 8 bytes by task 47 on cpu 1:
 xfrm_lookup_with_ifid+0x10da/0x1890 net/xfrm/xfrm_policy.c:3141
 xfrm_lookup net/xfrm/xfrm_policy.c:3193 [inline]
 xfrm_lookup_route+0x37/0x100 net/xfrm/xfrm_policy.c:3204
 ip6_dst_lookup_flow+0x94/0xc0 net/ipv6/ip6_output.c:1228
 send6+0x23a/0x3b0 drivers/net/wireguard/socket.c:139
 wg_socket_send_skb_to_peer+0xbb/0x120 drivers/net/wireguard/socket.c:178
 wg_socket_send_buffer_to_peer+0xd2/0xf0 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x109/0x150 drivers/net/wireguard/send.c:51
 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 arch/x86/entry/entry_64.S:306

write to 0xffff88813dc9a908 of 8 bytes by task 8 on cpu 0:
 xfrm_lookup_with_ifid+0x10da/0x1890 net/xfrm/xfrm_policy.c:3141
 xfrm_lookup net/xfrm/xfrm_policy.c:3193 [inline]
 xfrm_lookup_route+0x37/0x100 net/xfrm/xfrm_policy.c:3204
 ip6_dst_lookup_flow+0x94/0xc0 net/ipv6/ip6_output.c:1228
 send6+0x23a/0x3b0 drivers/net/wireguard/socket.c:139
 wg_socket_send_skb_to_peer+0xbb/0x120 drivers/net/wireguard/socket.c:178
 wg_socket_send_buffer_to_peer+0xd2/0xf0 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x109/0x150 drivers/net/wireguard/send.c:51
 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 arch/x86/entry/entry_64.S:306

value changed: 0x00000000773594ca -> 0x00000000773594cb

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8 Comm: kworker/u4:0 Tainted: G        W          6.1.0-rc3-syzkaller-00072-g8e5423e991e8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
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