================================================================== BUG: KCSAN: data-race in vti_tunnel_xmit / vti_tunnel_xmit write to 0xffff8880af09f198 of 8 bytes by task 8733 on cpu 1: vti_xmit net/ipv4/ip_vti.c:202 [inline] vti_tunnel_xmit+0x478/0xa50 net/ipv4/ip_vti.c:279 __netdev_start_xmit include/linux/netdevice.h:4420 [inline] netdev_start_xmit include/linux/netdevice.h:4434 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3296 __dev_queue_xmit+0x14c9/0x1b60 net/core/dev.c:3873 dev_queue_xmit+0x21/0x30 net/core/dev.c:3906 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x7a6/0xec0 net/ipv6/ip6_output.c:116 ip6_fragment+0x103d/0x1220 net/ipv6/ip6_output.c:858 __ip6_finish_output net/ipv6/ip6_output.c:140 [inline] __ip6_finish_output+0x2f9/0x330 net/ipv6/ip6_output.c:127 ip6_finish_output+0x41/0x160 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0xf2/0x280 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] ip6_local_out+0x74/0x90 net/ipv6/output_core.c:179 ip6_send_skb+0x53/0x110 net/ipv6/ip6_output.c:1792 ip6_push_pending_frames+0x9d/0xc0 net/ipv6/ip6_output.c:1812 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x1d22/0x21e0 net/ipv6/raw.c:956 read to 0xffff8880af09f198 of 8 bytes by task 8719 on cpu 0: vti_xmit net/ipv4/ip_vti.c:202 [inline] vti_tunnel_xmit+0x461/0xa50 net/ipv4/ip_vti.c:279 __netdev_start_xmit include/linux/netdevice.h:4420 [inline] netdev_start_xmit include/linux/netdevice.h:4434 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3296 __dev_queue_xmit+0x14c9/0x1b60 net/core/dev.c:3873 dev_queue_xmit+0x21/0x30 net/core/dev.c:3906 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x7a6/0xec0 net/ipv6/ip6_output.c:116 ip6_fragment+0x103d/0x1220 net/ipv6/ip6_output.c:858 __ip6_finish_output net/ipv6/ip6_output.c:140 [inline] __ip6_finish_output+0x2f9/0x330 net/ipv6/ip6_output.c:127 ip6_finish_output+0x41/0x160 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0xf2/0x280 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] ip6_local_out+0x74/0x90 net/ipv6/output_core.c:179 ip6_send_skb+0x53/0x110 net/ipv6/ip6_output.c:1792 ip6_push_pending_frames+0x9d/0xc0 net/ipv6/ip6_output.c:1812 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8719 Comm: syz-executor.2 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================