KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb (3) net	6	2	1766d	1792d	0/29	auto-closed as invalid on 2021/03/14 11:17
upstream	KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb (4) net	6	48	987d	1478d	0/29	auto-obsoleted due to no activity on 2023/05/02 11:32
upstream	KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb (6) net	6	2	878d	902d	0/29	auto-obsoleted due to no activity on 2023/08/19 13:30
upstream	KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb (2) net	6	1	1856d	1824d	0/29	auto-closed as invalid on 2020/12/25 11:33
upstream	KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb (5) net	6	1	945d	945d	0/29	auto-obsoleted due to no activity on 2023/06/13 21:35

================================================================== BUG: KCSAN: data-race in udp_tunnel6_xmit_skb / udp_tunnel6_xmit_skb write to 0xffff8880a059d188 of 8 bytes by task 3314 on cpu 1: iptunnel_xmit_stats include/net/ip_tunnels.h:459 [inline] ip6tunnel_xmit include/net/ip6_tunnel.h:165 [inline] udp_tunnel6_xmit_skb+0x474/0x4b0 net/ipv6/ip6_udp_tunnel.c:109 send6+0x2d7/0x3a0 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer drivers/net/wireguard/socket.c:177 [inline] wg_socket_send_buffer_to_peer+0x186/0x210 drivers/net/wireguard/socket.c:199 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0xf9/0x140 drivers/net/wireguard/send.c:51 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff8880a059d188 of 8 bytes by task 25569 on cpu 0: iptunnel_xmit_stats include/net/ip_tunnels.h:459 [inline] ip6tunnel_xmit include/net/ip6_tunnel.h:165 [inline] udp_tunnel6_xmit_skb+0x462/0x4b0 net/ipv6/ip6_udp_tunnel.c:109 send6+0x2d7/0x3a0 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer drivers/net/wireguard/socket.c:177 [inline] wg_socket_send_buffer_to_peer+0x186/0x210 drivers/net/wireguard/socket.c:199 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0xf9/0x140 drivers/net/wireguard/send.c:51 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 25569 Comm: kworker/u4:5 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker ==================================================================