r0 = socket$inet6_udp(0xa, 0x2, 0x0)
r1 = socket$inet6_icmp_raw(0xa, 0x3, 0x3a)
ioctl$sock_SIOCGIFINDEX(r1, 0x8933, &(0x7f0000000140)={'syz_tun\x00', <r2=>0x0})
ioctl$sock_ipv6_tunnel_SIOCGETTUNNEL(r0, 0x89f0, &(0x7f0000000380)={'sit0\x00', &(0x7f0000000300)={'sit0\x00', r2, 0x0, 0x0, 0x0, 0x0, 0x0, @private2, @loopback}})