================================================================== BUG: KCSAN: data-race in vti_tunnel_xmit / vti_tunnel_xmit write to 0xffff8880a1758190 of 8 bytes by task 18517 on cpu 0: vti_xmit net/ipv4/ip_vti.c:254 [inline] vti_tunnel_xmit+0x5a3/0xa80 net/ipv4/ip_vti.c:331 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0xc0/0x310 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0xf00/0x15a0 net/core/dev.c:4131 dev_queue_xmit+0x13/0x20 net/core/dev.c:4164 neigh_connected_output+0x24f/0x280 net/core/neighbour.c:1518 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x97f/0xb20 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x302/0x330 net/ipv6/ip6_output.c:143 ip6_finish_output+0x39/0x160 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x10e/0x210 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x60/0x80 net/ipv6/output_core.c:179 ip6_send_skb+0x43/0xf0 net/ipv6/ip6_output.c:1865 udp_v6_send_skb+0x7a3/0xa00 net/ipv6/udp.c:1175 udpv6_sendmsg+0x1529/0x1780 net/ipv6/udp.c:1473 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmmsg+0x322/0x4b0 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2522 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880a1758190 of 8 bytes by task 18528 on cpu 1: vti_xmit net/ipv4/ip_vti.c:254 [inline] vti_tunnel_xmit+0x591/0xa80 net/ipv4/ip_vti.c:331 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0xc0/0x310 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0xf00/0x15a0 net/core/dev.c:4131 dev_queue_xmit+0x13/0x20 net/core/dev.c:4164 neigh_connected_output+0x24f/0x280 net/core/neighbour.c:1518 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x97f/0xb20 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x302/0x330 net/ipv6/ip6_output.c:143 ip6_finish_output+0x39/0x160 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x10e/0x210 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x60/0x80 net/ipv6/output_core.c:179 ip6_send_skb+0x43/0xf0 net/ipv6/ip6_output.c:1865 udp_v6_send_skb+0x7a3/0xa00 net/ipv6/udp.c:1175 udpv6_sendmsg+0x1529/0x1780 net/ipv6/udp.c:1473 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmmsg+0x322/0x4b0 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2522 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18528 Comm: syz-executor.5 Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================