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BUG: KCSAN: data-race in vti_tunnel_xmit / vti_tunnel_xmit

write to 0xffff88809dffa130 of 8 bytes by task 6858 on cpu 0:
 vti_tunnel_xmit+0x5f9/0xb50 net/ipv4/ip_vti.c:313
 __netdev_start_xmit include/linux/netdevice.h:4533 [inline]
 netdev_start_xmit include/linux/netdevice.h:4547 [inline]
 xmit_one net/core/dev.c:3477 [inline]
 dev_hard_start_xmit+0xeb/0x420 net/core/dev.c:3493
 __dev_queue_xmit+0x11f7/0x1810 net/core/dev.c:4052
 dev_queue_xmit+0x1e/0x30 net/core/dev.c:4085
 neigh_direct_output+0x1c/0x30 net/core/neighbour.c:1529
 neigh_output include/net/neighbour.h:510 [inline]
 ip_finish_output2+0x3f2/0xed0 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x22f/0x460 net/ipv4/ip_output.c:288
 ip_finish_output+0x3e/0x160 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0xf2/0x240 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:435 [inline]
 ip_local_out+0x70/0x90 net/ipv4/ip_output.c:125
 ip_send_skb+0x32/0xb0 net/ipv4/ip_output.c:1560
 udp_send_skb.isra.0+0x3b8/0x8d0 net/ipv4/udp.c:891
 udp_sendmsg+0x1589/0x1930 net/ipv4/udp.c:1178
 udpv6_sendmsg+0xe75/0x1d40 net/ipv6/udp.c:1286
 inet6_sendmsg+0x69/0x90 net/ipv6/af_inet6.c:577
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x207/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmmsg+0x10e/0x310 net/socket.c:2506
 __do_sys_sendmmsg net/socket.c:2535 [inline]
 __se_sys_sendmmsg net/socket.c:2532 [inline]
 __x64_sys_sendmmsg+0x60/0x80 net/socket.c:2532
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809dffa130 of 8 bytes by task 6876 on cpu 1:
 vti_tunnel_xmit+0x5e6/0xb50 net/ipv4/ip_vti.c:313
 __netdev_start_xmit include/linux/netdevice.h:4533 [inline]
 netdev_start_xmit include/linux/netdevice.h:4547 [inline]
 xmit_one net/core/dev.c:3477 [inline]
 dev_hard_start_xmit+0xeb/0x420 net/core/dev.c:3493
 __dev_queue_xmit+0x11f7/0x1810 net/core/dev.c:4052
 dev_queue_xmit+0x1e/0x30 net/core/dev.c:4085
 neigh_direct_output+0x1c/0x30 net/core/neighbour.c:1529
 neigh_output include/net/neighbour.h:510 [inline]
 ip_finish_output2+0x3f2/0xed0 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x22f/0x460 net/ipv4/ip_output.c:288
 ip_finish_output+0x3e/0x160 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0xf2/0x240 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:435 [inline]
 ip_local_out+0x70/0x90 net/ipv4/ip_output.c:125
 ip_send_skb+0x32/0xb0 net/ipv4/ip_output.c:1560
 udp_send_skb.isra.0+0x3b8/0x8d0 net/ipv4/udp.c:891
 udp_sendmsg+0x1589/0x1930 net/ipv4/udp.c:1178
 udpv6_sendmsg+0xe75/0x1d40 net/ipv6/udp.c:1286
 inet6_sendmsg+0x69/0x90 net/ipv6/af_inet6.c:577
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x207/0x4c0 net/socket.c:2362
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2416
 __sys_sendmmsg+0x10e/0x310 net/socket.c:2506
 __do_sys_sendmmsg net/socket.c:2535 [inline]
 __se_sys_sendmmsg net/socket.c:2532 [inline]
 __x64_sys_sendmmsg+0x60/0x80 net/socket.c:2532
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6876 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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