r0 = socket$nl_generic(0x10, 0x3, 0x10)
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r0, 0x89f3, &(0x7f00000006c0)={'sit0\x00', &(0x7f0000000640)={'syztnl1\x00', 0x0, 0x2f, 0x0, 0x0, 0x0, 0x0, @mcast1, @dev}})