================================================================== BUG: KCSAN: data-race in ip_tunnel_xmit / ip_tunnel_xmit write to 0xffff888122ddf150 of 8 bytes by task 14026 on cpu 1: ip_tunnel_xmit+0xdd2/0x11c0 net/ipv4/ip_tunnel.c:813 sit_tunnel_xmit__ net/ipv6/sit.c:1058 [inline] sit_tunnel_xmit+0x3c2/0x11f0 net/ipv6/sit.c:1074 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] xmit_one+0xf9/0x270 net/core/dev.c:3654 dev_hard_start_xmit net/core/dev.c:3670 [inline] __dev_queue_xmit+0xd44/0x1300 net/core/dev.c:4245 dev_queue_xmit+0x13/0x20 net/core/dev.c:4278 neigh_connected_output+0x264/0x290 net/core/neighbour.c:1524 neigh_output include/net/neighbour.h:510 [inline] ip_finish_output2+0x874/0xb10 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:252 [inline] ip_finish_output+0x2fa/0x490 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0xf6/0x1a0 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:448 [inline] ip_local_out+0x167/0x230 net/ipv4/ip_output.c:126 ip_send_skb+0x27/0x90 net/ipv4/ip_output.c:1568 udp_send_skb+0x62d/0x860 net/ipv4/udp.c:953 udp_sendmsg+0xfe4/0x12f0 net/ipv4/udp.c:1240 udpv6_sendmsg+0x520/0x16b0 net/ipv6/udp.c:1351 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:642 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmmsg+0x315/0x4b0 net/socket.c:2490 __do_sys_sendmmsg net/socket.c:2519 [inline] __se_sys_sendmmsg net/socket.c:2516 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2516 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888122ddf150 of 8 bytes by task 14057 on cpu 0: ip_tunnel_xmit+0xdc0/0x11c0 net/ipv4/ip_tunnel.c:813 sit_tunnel_xmit__ net/ipv6/sit.c:1058 [inline] sit_tunnel_xmit+0x3c2/0x11f0 net/ipv6/sit.c:1074 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] xmit_one+0xf9/0x270 net/core/dev.c:3654 dev_hard_start_xmit net/core/dev.c:3670 [inline] __dev_queue_xmit+0xd44/0x1300 net/core/dev.c:4245 dev_queue_xmit+0x13/0x20 net/core/dev.c:4278 neigh_connected_output+0x264/0x290 net/core/neighbour.c:1524 neigh_output include/net/neighbour.h:510 [inline] ip_finish_output2+0x874/0xb10 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:252 [inline] ip_finish_output+0x2fa/0x490 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0xf6/0x1a0 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:448 [inline] ip_local_out+0x167/0x230 net/ipv4/ip_output.c:126 ip_send_skb+0x27/0x90 net/ipv4/ip_output.c:1568 udp_send_skb+0x62d/0x860 net/ipv4/udp.c:953 udp_sendmsg+0xfe4/0x12f0 net/ipv4/udp.c:1240 udpv6_sendmsg+0x520/0x16b0 net/ipv6/udp.c:1351 inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:642 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmmsg+0x315/0x4b0 net/socket.c:2490 __do_sys_sendmmsg net/socket.c:2519 [inline] __se_sys_sendmmsg net/socket.c:2516 [inline] __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2516 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14057 Comm: syz-executor.1 Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.1 (14057) used greatest stack depth: 10144 bytes left