================================================================== BUG: KCSAN: data-race in vti_tunnel_xmit / vti_tunnel_xmit write to 0xffff8880a4b83190 of 8 bytes by task 28976 on cpu 1: vti_xmit net/ipv4/ip_vti.c:233 [inline] vti_tunnel_xmit+0x401/0xb50 net/ipv4/ip_vti.c:310 __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] ip6_finish_output2+0x717/0xf60 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x2cb/0x320 net/ipv6/ip6_output.c:128 ip6_finish_output+0x3e/0x160 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x104/0x2a0 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:435 [inline] ip6_local_out+0x70/0x90 net/ipv6/output_core.c:179 ip6_send_skb+0x4f/0x110 net/ipv6/ip6_output.c:1865 ip6_push_pending_frames+0x93/0xb0 net/ipv6/ip6_output.c:1885 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x1e5c/0x2320 net/ipv6/raw.c:956 inet_sendmsg+0x69/0x90 net/ipv4/af_inet.c:807 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 0xffff8880a4b83190 of 8 bytes by task 28952 on cpu 0: vti_xmit net/ipv4/ip_vti.c:233 [inline] vti_tunnel_xmit+0x3ee/0xb50 net/ipv4/ip_vti.c:310 __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] ip6_finish_output2+0x717/0xf60 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x2cb/0x320 net/ipv6/ip6_output.c:128 ip6_finish_output+0x3e/0x160 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x104/0x2a0 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:435 [inline] ip6_local_out+0x70/0x90 net/ipv6/output_core.c:179 ip6_send_skb+0x4f/0x110 net/ipv6/ip6_output.c:1865 ip6_push_pending_frames+0x93/0xb0 net/ipv6/ip6_output.c:1885 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x1e5c/0x2320 net/ipv6/raw.c:956 inet_sendmsg+0x69/0x90 net/ipv4/af_inet.c:807 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: 0 PID: 28952 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================