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Bug 748354 - [lxc]setmem will get wrong error message when cgroup is unmounted.
Summary: [lxc]setmem will get wrong error message when cgroup is unmounted.
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt
Version: 6.2
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Osier Yang
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-10-24 08:56 UTC by zhpeng
Modified: 2013-09-09 00:03 UTC (History)
9 users (show)

Fixed In Version: libvirt-0.9.9-1.el6
Doc Type: Bug Fix
Doc Text:
No documentation needed.
Clone Of:
Environment:
Last Closed: 2012-06-20 06:35:51 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2012:0748 0 normal SHIPPED_LIVE Low: libvirt security, bug fix, and enhancement update 2012-06-19 19:31:38 UTC

Description zhpeng 2011-10-24 08:56:00 UTC 
Description of problem:
setmem will get wrong error message when cgroup is unmounted.

Version-Release number of selected component (if applicable):
libvirt-0.9.4-19.el6.x86_64
qemu-kvm-0.12.1.2-2.196.el6.x86_64
kernel-2.6.32-207.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. make sure a running lxc application container and cgroup is mounted.
2. virsh -c lxc:/// aaa list
    Id Name                 State
   ----------------------------------
   6182 aaa                  running

   virsh -c lxc:/// aaa aaa
   Id:             6182
   Name:           aaa
   UUID:           c2031d50-8629-00a5-c895-f3b3c2f7b96a
   OS Type:        exe
   State:          running
   CPU(s):         1
   CPU time:       0.0s
   Max memory:     1048576 kB
   Used memory:    428 kB
   Persistent:     yes
   Autostart:      disable
   Managed save:   unknown
3. unmount cgroup
   # /etc/init.d/cgconfig stop
   # /etc/init.d/libvirtd restart
   # lscgroup
     cgroups can't be listed: Cgroup is not mounted
4. setmem of the lxc guest
   # virsh -c lxc:/// setmem aaa 512000
   error：this function is not supported by the connection driver: cgroups must be configured on the host

   # virsh -c lxc:/// dominfo aaa
   Id:             6182
   Name:           aaa
   UUID:           c2031d50-8629-00a5-c895-f3b3c2f7b96a
   OS Type:        exe
   State:          running
   CPU(s):         1
   Max memory:     1048576 kB
   Used memory:    1048576 kB
   Persistent:     yes
   Autostart:      disable
   Managed save:   unknown

in debug info:

Actual results:
Step4 error message is incorrect.

Expected results:
The error is not right, *_OPERATION_INVALID is proper error code, but
the more sensiable error from cgroup detection is overridden, we need
the error from cgroup detection but not this one.
Comment 1 Alex Jia 2011-10-24 09:04:33 UTC 
Patch for upstream, but hasn't been backported to rhel6.2:

commit 6ac47762bb9c3851b07eaa871bfaf7ccd6017147
Author: Osier Yang <jyang>
Date:   Tue Aug 23 16:17:10 2011 +0800

    lxc: Cleanup improper VIR_ERR_NO_SUPPORT use
    
    s/VIR_ERR_NO_SUPPORT/VIR_ERR_OPERATION_INVALID/
    
    Special case is changes on lxcDomainInterfaceStats, if it's not
    implemented on the platform, prints error like:
    
        lxcError(VIR_ERR_OPERATION_INVALID, "%s",
                 _("interface stats not implemented on this platform"));
    
    As the function is supported by driver actually, error like
    VIR_ERR_NO_SUPPORT is confused.
Comment 2 Osier Yang 2011-12-12 07:48:49 UTC 
This is already fixed in upstream, move to POST.
Comment 4 Alex Jia 2012-01-10 10:20:31 UTC 
The bug has been fixed on libvirt-0.9.9-1.el6.x86_64:

# virsh -c lxc:/// setmem toy 400000
error: Requested operation is not valid: cgroups must be configured on the host
Comment 5 Osier Yang 2012-05-04 07:42:01 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
No documentation needed.
Comment 7 errata-xmlrpc 2012-06-20 06:35:51 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0748.html
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