slick-greeter memory usage is too high

[qaz171]

 * slick-greeter version (slick-greeter --version)
 * Distribution - (Mint 17.2, Arch, Fedora 25, etc...)
 * Graphics hardware *and* driver used
 * 32 or 64 bit

LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID: UniKylin
Description: UniKylin Linux release 3(Core)
Release: 3(Core)
Codename: Core

lightdm -v
lightdm 1.25.0

Issue

slick-greeter memory usage is too high， 94.7%，118.6g

Steps to reproduce

Expected behaviour

Other information

[qaz171]

top - 09:31:36 up 25 days, 14:15, 3 users, load average: 1.66, 1.57, 1.40
Tasks: 1147 total, 2 running, 1145 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.1 us, 0.5 sy, 0.0 ni, 98.4 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 13140064+total, 430700 free, 12804813+used, 2921812 buff/cache
KiB Swap: 67108860 total, 4965264 free, 62143596 used. 2243500 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
27549 lightdm 20 0 177.7g 118.6g 9164 S 0.3 94.7 299:34.16 slick-greeter
26345 root 20 0 41.7g 552872 1632 S 0.0 0.4 15:34.58 java