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BUG: KCSAN: data-race in vti_tunnel_xmit / vti_tunnel_xmit

write to 0xffff8880a616c130 of 8 bytes by task 10959 on cpu 1:
 vti_xmit net/ipv4/ip_vti.c:275 [inline]
 vti_tunnel_xmit+0x852/0xab0 net/ipv4/ip_vti.c:309
 __netdev_start_xmit include/linux/netdevice.h:4634 [inline]
 netdev_start_xmit include/linux/netdevice.h:4648 [inline]
 xmit_one+0xc0/0x310 net/core/dev.c:3561
 dev_hard_start_xmit net/core/dev.c:3577 [inline]
 __dev_queue_xmit+0xf00/0x15a0 net/core/dev.c:4136
 dev_queue_xmit+0x13/0x20 net/core/dev.c:4169
 packet_snd net/packet/af_packet.c:2979 [inline]
 packet_sendmsg+0x2cc5/0x3400 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2359
 ___sys_sendmsg net/socket.c:2413 [inline]
 __sys_sendmsg+0x1df/0x260 net/socket.c:2446
 __do_sys_sendmsg net/socket.c:2455 [inline]
 __se_sys_sendmsg net/socket.c:2453 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2453
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a616c130 of 8 bytes by task 10961 on cpu 0:
 vti_xmit net/ipv4/ip_vti.c:275 [inline]
 vti_tunnel_xmit+0x83f/0xab0 net/ipv4/ip_vti.c:309
 __netdev_start_xmit include/linux/netdevice.h:4634 [inline]
 netdev_start_xmit include/linux/netdevice.h:4648 [inline]
 xmit_one+0xc0/0x310 net/core/dev.c:3561
 dev_hard_start_xmit net/core/dev.c:3577 [inline]
 __dev_queue_xmit+0xf00/0x15a0 net/core/dev.c:4136
 dev_queue_xmit+0x13/0x20 net/core/dev.c:4169
 packet_snd net/packet/af_packet.c:2979 [inline]
 packet_sendmsg+0x2cc5/0x3400 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2359
 ___sys_sendmsg net/socket.c:2413 [inline]
 __sys_sendmsg+0x1df/0x260 net/socket.c:2446
 __do_sys_sendmsg net/socket.c:2455 [inline]
 __se_sys_sendmsg net/socket.c:2453 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2453
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10961 Comm: syz-executor.3 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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