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SubjectMount structures are leaked
Hello,

We found that mount structures are leaked on the upstream linux kernel:

[root@zdtm criu]# cat /proc/slabinfo | grep mnt
mnt_cache 36456 36456 384 42 4 : tunables 0 0
0 : slabdata 868 868 0
[root@zdtm criu]# python test/zdtm.py run -t zdtm/static/env00
--iter 10 -f ns
=== Run 1/1 ================ zdtm/static/env00

========================= Run zdtm/static/env00 in ns ==========================
Start test
./env00 --pidfile=env00.pid --outfile=env00.out --envname=ENV_00_TEST
Run criu dump
Run criu restore
Run criu dump
....
Run criu restore
Send the 15 signal to 339
Wait for zdtm/static/env00(339) to die for 0.100000
Removing dump/zdtm/static/env00/31
========================= Test zdtm/static/env00 PASS ==========================
[root@zdtm criu]# cat /proc/slabinfo | grep mnt
mnt_cache 36834 36834 384 42 4 : tunables 0 0
0 : slabdata 877 877 0

[root@zdtm linux]# git describe HEAD
v4.12-rc4-122-gb29794e

[root@zdtm ~]# uname -a
Linux zdtm.openvz.org 4.12.0-rc4+ #2 SMP Thu Jun 8 20:49:01 CEST 2017
x86_64 x86_64 x86_64 GNU/Linux

Thanks,
Andrei

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