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Subject[Suggestion] kernel: cgroup: mount failure in LTP cgroup_regression_test.sh
Hello Maintainers:

On Fedora16 with defconfig for next-20131107 kernel, use latest LTP
(Linux Test Project) version, test_5() in cgroup_regression_test.sh
will be fail. The related LTP output:

<<<test_start>>>
tag=cgroup stime=1383562810
cmdline=" cgroup_regression_test.sh"
contacts=""
analysis=exit
<<<test_output>>>
cgroup_regression_test 1 TPASS : no kernel bug was found
/opt/ltp/testcases/bin/cgroup_regression_test.sh: line 118: 13283 Terminated ./fork_processes
cgroup_regression_test 2 TPASS : notify_on_release is inherited
cgroup_regression_test 3 TCONF : CONFIG_SCHED_DEBUG is not enabled
cgroup_regression_test 4 TCONF : CONFIG_LOCKDEP is not enabled
mount: xxx already mounted or cgroup/ busy
cgroup_regression_test 5 TFAIL : mount freezer and cpuacct failed
cgroup_regression_test 6 TCONF : CONFIG_CGROUP_NS
/opt/ltp/testcases/bin/cgroup_regression_test.sh: line 360: 24428 Terminated sleep 100 < cgroup/0
/opt/ltp/testcases/bin/cgroup_regression_test.sh: line 381: 24447 Terminated sleep 100 < cgroup/0
cgroup_regression_test 7 TPASS : no kernel bug was found
cgroup_regression_test 8 TPASS : no kernel bug was found
cgroup_regression_test 9 TPASS : no kernel warning was found
rmdir: failed to remove `cgroup/0': No such file or directory
umount: /sys/fs/cgroup/systemd: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
cgroup_regression_test 10 TPASS : no kernel warning was found
<<<execution_status>>>
initiation_status="ok"
duration=62 termination_type=exited termination_id=1 corefile=no
cutime=3341 cstime=6353
<<<test_end>>>

After simplify, the related operation, environments and output are:

[root@gchenlinux tmp]# df -Th | grep cgroup
tmpfs tmpfs 1001M 0 1001M 0% /sys/fs/cgroup
[root@gchenlinux tmp]# lsof | grep cgroup | grep -v grep
systemd 1 root 6r DIR 0,18 0 5998 /sys/fs/cgroup/systemd/system
[root@gchenlinux tmp]# cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
cpuset 3 4 1
cpu 4 35 1
cpuacct 4 35 1
freezer 5 4 1
[root@gchenlinux tmp]# mkdir cgroup
[root@gchenlinux tmp]# mount -t cgroup -o freezer,cpuacct xxx cgroup/
mount: xxx already mounted or cgroup/ busy

Is it real issue of cgroup? If it is, I will/should continue analyzing.


Welcome any additional suggestions and completions.

Thanks.
--
Chen Gang


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