r0 = syz_init_net_socket$802154_dgram(0x24, 0x2, 0x0)
r1 = dup(r0)
setsockopt$inet6_MRT6_ADD_MFC_PROXY(r1, 0x29, 0xd2, &(0x7f0000000000)={{0xa, 0x0, 0x0, @mcast2}, {0xa, 0x0, 0x0, @private2}}, 0x5c)