857013 – Failed to run cpu-stats after vcpu hotplug

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 857013 - Failed to run cpu-stats after vcpu hotplug

Summary: Failed to run cpu-stats after vcpu hotplug

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	libvirt
Sub Component:
Version:	6.4
Hardware:	Unspecified
OS:	Unspecified
Priority:	high
Severity:	high
Target Milestone:	rc
Target Release:	---
Assignee:	Osier Yang
QA Contact:	Virtualization Bugs
Docs Contact:
URL:
Whiteboard:
Duplicates (1):	864381 (view as bug list)
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2012-09-13 11:42 UTC by hongming
Modified:	2013-02-21 07:23 UTC (History)
CC List:	8 users (show)
Fixed In Version:	libvirt-0.10.2-3.el6
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:	2013-02-21 07:23:50 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2013:0276	0	normal	SHIPPED_LIVE	Moderate: libvirt security, bug fix, and enhancement update	2013-02-20 21:18:26 UTC

Description hongming 2012-09-13 11:42:42 UTC

Description of problem:
Failed to run cpu-stats after vcpu hotplug. The following error occur.
error: Failed to virDomainGetCPUStats()
error: internal error error accessing cgroup cpuacct for vcpu 

Version-Release number of selected component (if applicable):
libvirt-0.10.1-1.el6.x86_64
qemu-kvm-0.12.1.2-2.307.el6.x86_64


How reproducible:
100% 

Steps to Reproduce:
1.# virsh start rhel6.2
Domain rhel6.2 started

2.# virsh vcpucount rhel6.2
maximum      config       160
maximum      live         160
current      config         1
current      live           1

3.# virsh cpu-stats rhel6.2
CPU0:
    cpu_time             7.947330261 seconds
    vcpu_time            7.660429534 seconds
CPU1:
    cpu_time             2.387255727 seconds
    vcpu_time            2.203674969 seconds
CPU2:
    cpu_time             0.523415331 seconds
    vcpu_time            0.322719706 seconds
CPU3:
    cpu_time             0.183748952 seconds
    vcpu_time            0.133049415 seconds
Total:
    cpu_time            11.041750271 seconds
    user_time            0.280000000 seconds
    system_time          2.970000000 seconds

4.# virsh setvcpus rhel6.2 2

5.# virsh vcpucount rhel6.2
maximum      config       160
maximum      live         160
current      config         1
current      live           2

6.# virsh cpu-stats rhel6.2
error: Failed to virDomainGetCPUStats()
error: internal error error accessing cgroup cpuacct for vcpu 
  
Actual results:
Failed to run cpu-stats after vcpu hotplug. 

Expected results:
Run cpu-stats successfully 

Additional info:

Comment 2 Peter Krempa 2012-09-13 12:03:02 UTC

The root issue that causes this bug will probably be very similar/identical to https://bugzilla.redhat.com/show_bug.cgi?id=855218 .

Comment 3 hongming 2012-09-21 06:54:03 UTC

I found another bug as follows . Do I need to file a new bug about it? They have different errors


Description
Failed to set vcpu scheduler parameters after hotplug vcpu.  The following errors occur.
error: Unable to find vcpu cgroup for rhel6.2(vcpu: 1): No such file or directory


Version
libvirt-0.10.2-0rc1.el6.x86_64
qemu-kvm-0.12.1.2-2.307.el6.x86_64

How reproducible:
100%

Steps

1.# virsh start rhel6.2
Domain rhel6.2 started

2.# virsh vcpucount rhel6.2
maximum      config        10
maximum      live          10
current      config         1
current      live           1

3.# virsh setvcpus rhel6.2 2

4.# virsh schedinfo rhel6.2
Scheduler      : posix
cpu_shares     : 2048
vcpu_period    : 1000000
vcpu_quota     : 18446744073709551
emulator_period: 1000000
emulator_quota : 18446744073709551

5.# virsh schedinfo rhel6.2 --set vcpu_quota=1000
Scheduler      : posix
error: Unable to find vcpu cgroup for rhel6.2(vcpu: 1): No such file or
directory

6.# ll /cgroup/cpu/libvirt/qemu/rhel6.2/vcpu1
ls: cannot access /cgroup/cpu/libvirt/qemu/rhel6.2/vcpu1: No such file
or directory


7.# vim /var/log/libvirtd.log
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupNew:617 : New group
/libvirt/qemu/rhel6.2/vcpu1
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 0:cpu at /cgroup/cpu in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 1:cpuacct at /cgroup/cpuacct in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 2:cpuset at /cgroup/cpuset in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 3:memory at /cgroup/memory in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 4:devices at /cgroup/devices in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 5:freezer at /cgroup/freezer in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupDetect:273 :
Detected mount/mapping 6:blkio at /cgroup/blkio in
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupMakeGroup:535 :
Make group /libvirt/qemu/rhel6.2/vcpu1
2012-09-20 03:22:18.687+0000: 1511: debug : virCgroupMakeGroup:560 :
Make controller /cgroup/cpu/libvirt/qemu/rhel6.2/vcpu1/
2012-09-20 03:22:18.687+0000: 1511: error : qemuSetVcpusBWLive:7745 :
Unable to find vcpu cgroup for rhel6.2(vcpu: 1): No such file or directory
2012-09-20 03:22:18.687+0000: 1511: debug : virDomainFree:2281 :
dom=0x7f852800dd70, (VM: name=rhel6.2,
uuid=17210b7f-6bcf-c46d-404e-9652796a93b9)
2012-09-20 03:22:18.687+0000: 1511: debug : virObjectUnref:135 :
OBJECT_UNREF: obj=0x7f852800dd70
2012-09-20 03:22:18.687+0000: 1511: debug : virObjectUnref:137 :
OBJECT_DISPOSE: obj=0x7f852800dd70
2012-09-20 03:22:18.687+0000: 1511: debug : virDomainDispose:225 :
release domain 0x7f852800dd70 rhel6.2 17210b7f-6bcf-c46d-404e-9652796a93b9
2012-09-20 03:22:18.687+0000: 1511: debug : virObjectUnref:135 :
OBJECT_UNREF: obj=0x7f851805b2f0


Actual result
Failed to set vcpu scheduler parameters after hotplug vcpu.

Expect result
Successfully set vcpu scheduler parameters after hotplug vcpu.

Additional info

Comment 4 Dave Allan 2012-10-08 17:14:12 UTC

Osier, FYI Peter thinks that this BZ and BZ 855218 are duplicates.

Comment 5 Osier Yang 2012-10-09 09:39:42 UTC

(In reply to comment #3)
> I found another bug as follows . Do I need to file a new bug about it? They
> have different errors
> 
> 
> Description
> Failed to set vcpu scheduler parameters after hotplug vcpu.  The following
> errors occur.
> error: Unable to find vcpu cgroup for rhel6.2(vcpu: 1): No such file or
> directory
> 

Yes, it's separate bug.

Comment 6 Osier Yang 2012-10-09 14:03:38 UTC

*** Bug 864381 has been marked as a duplicate of this bug. ***

Comment 7 Osier Yang 2012-10-10 11:36:13 UTC

Patch posted.

https://www.redhat.com/archives/libvir-list/2012-October/msg00372.html

Comment 11 yuping zhang 2012-10-16 07:20:52 UTC

Verified this issue with:
libvirt-0.10.2-3.el6.x86_64
qemu-kvm-0.12.1.2-2.316.el6.x86_64
kernel-2.6.32-287.el6.x86_64
libssh2-1.4.2-1.el6.x86_64

1.Verify issue in Description:
# virsh start RHEL6.4
Domain RHEL6.4 started

# virsh vcpucount RHEL6.4
maximum      config         4
maximum      live           4
current      config         1
current      live           1

# virsh cpu-stats RHEL6.4
CPU0:
	cpu_time             0.453463440 seconds
	vcpu_time            0.409547097 seconds
CPU1:
	cpu_time             0.515977155 seconds
	vcpu_time            0.478160264 seconds
CPU2:
	cpu_time            11.989434488 seconds
	vcpu_time           11.464623158 seconds
CPU3:
	cpu_time             6.079361532 seconds
	vcpu_time            5.480842340 seconds
Total:
	cpu_time            19.041352016 seconds
	user_time            0.600000000 seconds
	system_time          6.360000000 seconds

# virsh setvcpus RHEL6.4 2

# virsh vcpucount RHEL6.4
maximum      config         4
maximum      live           4
current      config         1
current      live           2

# virsh cpu-stats RHEL6.4
CPU0:
	cpu_time             1.007111478 seconds
	vcpu_time            0.491676600 seconds
CPU1:
	cpu_time             0.775450917 seconds
	vcpu_time            0.596590081 seconds
CPU2:
	cpu_time            14.678617165 seconds
	vcpu_time           13.331851397 seconds
CPU3:
	cpu_time             7.744602633 seconds
	vcpu_time            6.376867462 seconds
Total:
	cpu_time            24.205879763 seconds
	user_time            0.630000000 seconds
	system_time          7.130000000 seconds

2.Verify issue in Comment 3
# virsh vcpucount RHEL6.4
maximum      config         4
maximum      live           4
current      config         1
current      live           1

# virsh setvcpus RHEL6.4 2

# virsh schedinfo RHEL6.4
Scheduler      : posix
cpu_shares     : 1024
vcpu_period    : 100000
vcpu_quota     : -1
emulator_period: 100000
emulator_quota : -1

# virsh schedinfo RHEL6.4 --set vcpu_quota=1000
Scheduler      : posix
cpu_shares     : 1024
vcpu_period    : 100000
vcpu_quota     : 1000
emulator_period: 100000
emulator_quota : -1

# ll /cgroup/cpu/libvirt/qemu/RHEL6.4/vcpu1
total 0
--w--w--w-. 1 root root 0 Oct 15 21:52 cgroup.event_control
-r--r--r--. 1 root root 0 Oct 15 21:52 cgroup.procs
-rw-r--r--. 1 root root 0 Oct 15 21:52 cpu.cfs_period_us
-rw-r--r--. 1 root root 0 Oct 15 21:53 cpu.cfs_quota_us
-rw-r--r--. 1 root root 0 Oct 15 21:52 cpu.rt_period_us
-rw-r--r--. 1 root root 0 Oct 15 21:52 cpu.rt_runtime_us
-rw-r--r--. 1 root root 0 Oct 15 21:52 cpu.shares
-r--r--r--. 1 root root 0 Oct 15 21:52 cpu.stat
-rw-r--r--. 1 root root 0 Oct 15 21:52 notify_on_release
-rw-r--r--. 1 root root 0 Oct 15 21:52 tasks

So change the bug status to VERIFIED.

Comment 12 errata-xmlrpc 2013-02-21 07:23:50 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-2013-0276.html

Note You need to log in before you can comment on or make changes to this bug.