================================================================== BUG: KCSAN: data-race in dst_cache_set_ip6 / fib6_clean_node write to 0xffff88813df1702c of 4 bytes by task 31161 on cpu 1: fib6_clean_node+0xc2/0x260 net/ipv6/ip6_fib.c:2177 fib6_walk_continue+0x38e/0x430 net/ipv6/ip6_fib.c:2111 fib6_walk net/ipv6/ip6_fib.c:2159 [inline] fib6_clean_tree net/ipv6/ip6_fib.c:2239 [inline] __fib6_clean_all+0x1a9/0x2e0 net/ipv6/ip6_fib.c:2255 fib6_flush_trees+0x6c/0x80 net/ipv6/ip6_fib.c:2280 rt_genid_bump_ipv6 include/net/net_namespace.h:454 [inline] addrconf_dad_completed+0x57f/0x870 net/ipv6/addrconf.c:4230 addrconf_dad_work+0x908/0x1170 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298 worker_thread+0x616/0xa70 kernel/workqueue.c:2445 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 read to 0xffff88813df1702c of 4 bytes by task 10308 on cpu 0: fib6_get_cookie_safe include/net/ip6_fib.h:284 [inline] rt6_get_cookie include/net/ip6_fib.h:305 [inline] dst_cache_set_ip6+0xd3/0x1e0 net/core/dst_cache.c:115 send6+0x270/0x3b0 drivers/net/wireguard/socket.c:148 wg_socket_send_skb_to_peer+0xbb/0x130 drivers/net/wireguard/socket.c:177 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x142/0x360 drivers/net/wireguard/send.c:276 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298 worker_thread+0x616/0xa70 kernel/workqueue.c:2445 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 value changed: 0x000001bb -> 0x000001c1 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10308 Comm: kworker/0:1 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-crypt-wg0 wg_packet_tx_worker ================================================================== IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready bridge0: port 1(bridge_slave_0) entered disabled state bridge0: port 2(bridge_slave_1) entered disabled state