================================================================== BUG: KCSAN: data-race in ip6_tnl_start_xmit / ip6_tnl_start_xmit write to 0xffff8881225d5140 of 8 bytes by task 30529 on cpu 1: ip6_tnl_start_xmit+0x449/0x1160 net/ipv6/ip6_tunnel.c:1415 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] dev_direct_xmit+0x283/0x390 net/core/dev.c:4079 packet_direct_xmit+0xe3/0x140 net/packet/af_packet.c:240 packet_snd net/packet/af_packet.c:2965 [inline] packet_sendmsg+0x1ed8/0x3b60 net/packet/af_packet.c:2990 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:659 ____sys_sendmsg+0x212/0x4d0 net/socket.c:2330 ___sys_sendmsg+0xb5/0x100 net/socket.c:2384 __sys_sendmmsg+0x123/0x350 net/socket.c:2474 __do_sys_sendmmsg net/socket.c:2503 [inline] __se_sys_sendmmsg net/socket.c:2500 [inline] __x64_sys_sendmmsg+0x64/0x80 net/socket.c:2500 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881225d5140 of 8 bytes by task 30535 on cpu 0: ip6_tnl_start_xmit+0x436/0x1160 net/ipv6/ip6_tunnel.c:1415 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] dev_direct_xmit+0x283/0x390 net/core/dev.c:4079 packet_direct_xmit+0xe3/0x140 net/packet/af_packet.c:240 packet_snd net/packet/af_packet.c:2965 [inline] packet_sendmsg+0x1ed8/0x3b60 net/packet/af_packet.c:2990 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:659 ____sys_sendmsg+0x212/0x4d0 net/socket.c:2330 ___sys_sendmsg+0xb5/0x100 net/socket.c:2384 __sys_sendmmsg+0x123/0x350 net/socket.c:2474 __do_sys_sendmmsg net/socket.c:2503 [inline] __se_sys_sendmmsg net/socket.c:2500 [inline] __x64_sys_sendmmsg+0x64/0x80 net/socket.c:2500 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 30535 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================