netlink: 8 bytes leftover after parsing attributes in process `syz.0.2716'.
netlink: 'syz.0.2716': attribute type 10 has an invalid length.
==================================================================
BUG: KCSAN: data-race in l3mdev_master_ifindex_rcu / team_add_slave

read to 0xffff88811b134000 of 8 bytes by task 3932 on cpu 0:
 netif_is_l3_master include/linux/netdevice.h:5580 [inline]
 l3mdev_master_ifindex_rcu+0x1c/0xb0 net/l3mdev/l3mdev.c:117
 ipv6_dev_get_saddr+0x193/0x470 net/ipv6/addrconf.c:1900
 ip6_route_get_saddr include/net/ip6_route.h:162 [inline]
 ip6_dst_lookup_tail+0x3d8/0xa90 net/ipv6/ip6_output.c:1163
 ip6_dst_lookup_flow+0x74/0xf0 net/ipv6/ip6_output.c:1291
 send6+0x29f/0x490 drivers/net/wireguard/socket.c:139
 wg_socket_send_skb_to_peer+0xc0/0x130 drivers/net/wireguard/socket.c:177
 wg_socket_send_buffer_to_peer+0xf1/0x120 drivers/net/wireguard/socket.c:199
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x10d/0x160 drivers/net/wireguard/send.c:51
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read-write to 0xffff88811b134000 of 8 bytes by task 13518 on cpu 1:
 team_upper_dev_link drivers/net/team/team_core.c:1198 [inline]
 team_port_add drivers/net/team/team_core.c:1332 [inline]
 team_add_slave+0x6df/0x1810 drivers/net/team/team_core.c:2113
 do_set_master+0x37b/0x450 net/core/rtnetlink.c:3020
 do_setlink+0x976/0x2860 net/core/rtnetlink.c:3222
 rtnl_changelink net/core/rtnetlink.c:3849 [inline]
 __rtnl_newlink net/core/rtnetlink.c:4022 [inline]
 rtnl_newlink+0x1086/0x1400 net/core/rtnetlink.c:4159
 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:7076
 netlink_rcv_skb+0x11e/0x220 net/netlink/af_netlink.c:2556
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7103
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x5a7/0x680 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x5be/0x6f0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:775 [inline]
 __sock_sendmsg net/socket.c:790 [inline]
 ____sys_sendmsg+0x532/0x580 net/socket.c:2684
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2738
 __sys_sendmsg net/socket.c:2770 [inline]
 __do_sys_sendmsg net/socket.c:2775 [inline]
 __se_sys_sendmsg net/socket.c:2773 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2773
 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 13518 Comm: syz.0.2716 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
==================================================================
team0: Device wg2 is of different type