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Bug 635984

Summary: lssubsys -am does not show all subsystems after hierarchy remount
Product: Red Hat Enterprise Linux 6 Reporter: David Kutálek <dkutalek>
Component: libcgroupAssignee: Ivana Varekova <varekova>
Status: CLOSED ERRATA QA Contact: Petr Beňas <pbenas>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.0CC: jsafrane, pbenas, pstehlik, rvokal
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-05-19 13:13:17 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 672300    

Description David Kutálek 2010-09-21 08:56:13 UTC 
Description of problem:

After first mount of hierarchy, lssubsys -am prints all subsystems correctly. But after remounting, subsystems that was already mounted (and after remount are still mounted) are not listed by lssubsys:

---
# cat /proc/cgroups 
#subsys_name	hierarchy	num_cgroups	enabled
cpuset	0	1	1
ns	0	1	1
cpu	0	1	1
cpuacct	0	1	1
memory	0	1	1
devices	0	1	1
freezer	0	1	1
net_cls	0	1	1
blkio	0	1	1

# mount -t cgroup -o cpu,memory,net_cls lab1 /cgroup/lab1
# cat /proc/cgroups 
#subsys_name	hierarchy	num_cgroups	enabled
cpuset	0	1	1
ns	0	1	1
cpu	2	1	1
cpuacct	0	1	1
memory	2	1	1
devices	0	1	1
freezer	0	1	1
net_cls	2	1	1
blkio	0	1	1

# mount -t cgroup -o remount,cpuset,cpu,memory,net_cls lab1 /cgroup/lab1
# cat /proc/cgroups 
#subsys_name	hierarchy	num_cgroups	enabled
cpuset	2	1	1
ns	0	1	1
cpu	2	1	1
cpuacct	0	1	1
memory	2	1	1
devices	0	1	1
freezer	0	1	1
net_cls	2	1	1
blkio	0	1	1

# lssubsys -am
cpuset /cgroup/lab17
ns
cpuacct
devices
freezer
blkio
# 
---

Version-Release number of selected component (if applicable):

libcgroup-0.36.1-6.el6.x86_64

How reproducible:

Always

Steps to Reproduce:
1. mount cgroup hierarchy with x,y subsystems
2. remount it with x,y,z subsystems
3. lssubsys -am
  
Actual results:

x and y subsystems missing

Expected results:

all subsystems should be listed

Additional info:
Comment 1 David Kutálek 2010-09-21 10:07:21 UTC 
This bug affects also cgcreate command:

# cgcreate -g cpu:group1/subgroup11
cgcreate: can't create cgroup group1/subgroup11: Cgroup one of the needed subsystems is not mounted

# mount | grep lab1
lab1 on /cgroup/lab1 type cgroup (rw,cpu,memory,net_cls,cpuset)

# cgcreate -g cpuset:group1/subgroup11
#

Raising prio to medium.
Comment 2 Ivana Varekova 2010-09-23 11:04:04 UTC 
    patch just sent to upstream: 
    http://sourceforge.net/mailarchive/forum.php?thread_name=20100923101307.20662.51660.stgit%40dhcp-25-243.brq.redhat.com&forum_name=libcg-devel
Comment 5 Petr Beňas 2011-01-31 11:15:25 UTC 
Reproduced in licgroup-0.36.1-6.el6 and verified in libcgroup-0.37-1.el6.
Comment 6 errata-xmlrpc 2011-05-19 13:13:17 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0577.html