r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
ioctl$sock_inet6_SIOCADDRT(r0, 0x890b, &(0x7f0000000080)={@loopback, @mcast2, @private1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x6932bdbced2753b8})