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 807167 - Kernel panic or call trace when hotplugging multiple vcpus
Summary: Kernel panic or call trace when hotplugging multiple vcpus
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm
Version: 6.3
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Igor Mammedov
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-03-27 08:09 UTC by FuXiangChun
Modified: 2012-04-24 10:35 UTC (History)
16 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-04-24 10:35:04 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
call trace and kernel panic log (5.23 KB, application/octet-stream)
2012-03-27 08:10 UTC, FuXiangChun
no flags Details

Description FuXiangChun 2012-03-27 08:09:23 UTC
Description of problem:
Hotplug vcpus >100 and <=160. sometimes guest show call trace or kernel panic.
Encountered only once kernel panic. 
Version-Release number of selected component (if applicable):

host kernel:
# uname -r
2.6.32-257.el6.x86_64

qemu vesion:
qemu-kvm-0.12.1.2-2.265.el6.x86_64

How reproducible:
sometimes

Steps to Reproduce:
1./usr/libexec/qemu-kvm -M rhel6.3.0 -cpu host --enable-kvm -m 4G -smp 1,maxcpus=161 -name rhel6.3 -uuid ddcbfb49-3411-1701-3c36-6bdbc00bedbb -rtc base=utc,clock=host,driftfix=slew -drive file=/dev/vg-54/lvtest,if=none,id=ide,format=qcow2,cache=none,werror=stop,rerror=stop -device ide-drive,drive=ide,id=drive-ide0-0-0,bootindex=1 -netdev tap,id=hostnet1 -device e1000,netdev=hostnet1,id=net1,mac=86:12:50:a4:32:72 -spice port=5911,disable-ticketing -vga qxl -device sga -chardev socket,id=serial0,path=/var/test1,server,nowait -device isa-serial,chardev=serial0 -balloon virtio -monitor unix:/tmp/monitor2,server,nowait -monitor stdio

2.use below script to hotplug vcpus
i=1
while [ $i -lt 160 ]
do
sleep 1
echo "cpu_set $i online"|nc -U /tmp/monitor2
i=$(($i+1))
done

3.
  
Actual results:
guest call trace or kernel panic 

Expected results:
guest work well and hotplug vcpus successfully

Additional info:

add log to attachment

Comment 1 FuXiangChun 2012-03-27 08:10:13 UTC
Created attachment 572968 [details]
call trace and kernel panic log

Comment 2 FuXiangChun 2012-03-27 08:20:43 UTC
guest information:

rhel6.3 64bit guest

kernel version:
uname -r
2.6.32-251.el6.x86_64

Comment 4 Igor Mammedov 2012-03-27 16:37:38 UTC
Warning is from from bug 805362 it is fixed there.

But panic is something new. Can you reproduce it with:
  virsh setvcpus rhel6guest 160 --live
it is basically the same as script in comment#1

Comment 5 Igor Mammedov 2012-04-16 10:24:13 UTC
FuXiangChun,

Can you reproduce panic with latest qemu-kvm/seabios builds?

Comment 6 FuXiangChun 2012-04-17 10:57:41 UTC
(In reply to comment #5)
> FuXiangChun,
> 
> Can you reproduce panic with latest qemu-kvm/seabios builds?

I will re-test it as soon as possible.

Comment 7 FuXiangChun 2012-04-23 02:31:16 UTC
(In reply to comment #6)
> (In reply to comment #5)
> > FuXiangChun,
> > 
> > Can you reproduce panic with latest qemu-kvm/seabios builds?

Re-tested this bug with qemu-kvm-0.12.1.2-2.282.el6.x86_64 and seabios-0.6.1.2-19.el6.x86_64

testing result:
only get below message from dmesg, hotplug all cpus successfully and guest work well. 
microcode: CPU2: update failed (for patch_level=0x1000083)
microcode: CPU3: update failed (for patch_level=0x1000083)

guest kernel version
uname -r
2.6.32-262.el6.x86_64

Comment 8 Igor Mammedov 2012-04-24 10:35:04 UTC
(In reply to comment #7)
> testing result:
> only get below message from dmesg, hotplug all cpus successfully and guest work
> well. 
according to above closing bug.

> microcode: CPU2: update failed (for patch_level=0x1000083)
> microcode: CPU3: update failed (for patch_level=0x1000083)
It's not supported, it should fail.

> 
> guest kernel version
> uname -r
> 2.6.32-262.el6.x86_64


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