syz_genetlink_get_family_id$SEG6(0x0, 0xffffffffffffffff)
r0 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCGIFNETMASK(r0, 0x891b, &(0x7f0000000940)={'ip6tnl0\x00'})