[CentOS-virt] [QEMU-KVM] Centos guest VM freezing

Manuel Wolfshant

wolfy at nobugconsulting.ro
Wed Jan 9 10:00:31 UTC 2019

On 1/9/19 11:50 AM, Akshar Kanak wrote:
> Hi
> Thanks for the reply
> We have seen the same guest VM freezing on vmware ESXi machine also ,

No wonder given that the guest remains 5 years out of date even when 
using a different hypervisor. Leaving aside that also the long-term 
kernel installed from ElRepo that you are using is also more then 4 
years out of date.

Please update the OS(es) to the current supported OS versions ( that is, 
7.6 / 6.10 ) and verify if the problems persist. But you've already been 
told that by several persons...

> so we were interested in know in the internal condition of the guest 
> vm when the freeze happened
> How can we analyse the core file generated by "virsh dump "

http://bfy.tw/LhMS might help with that



> Thanks and regards
> Akshar
> On Wed, Jan 9, 2019 at 1:58 PM Manuel Wolfshant 
> <wolfy at nobugconsulting.ro <mailto:wolfy at nobugconsulting.ro>> wrote:
>     On 1/9/19 10:24 AM, Akshar Kanak wrote:
>>     Dear team
>>         I am running a centos guest VM  which freezes for every few
>>     days . The qemu-kvm on  shows 100% cpu utilization.
>>         Ping to the guest might work or may not work .Please can you
>>     tell me what approach can i take to debug it .
>>         using "virsh dump" I can dump the core of the  guest vm but I
>>     am not sure how to analyse it .
>>         Guest Centos VM : "Linux GUESTCentOS70
>>     3.10.0-123.4.4.el7.x86_64 #1 SMP Fri Jul 25 05:07:12 UTC 2014
>>     x86_64 x86_64 x86_64 GNU/Linux"
>>     "CentOS Linux release 7.0.1406 (Core)"
>>     1 vcpu and 2 GB ram
>>     Host machine : "Linux HOST 3.10.51-1.el6.elrepo.x86_64 #1 SMP Fri
>>     Aug 1 13:14:11 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux"
>>     "CentOS release 6.5 (Final)"
>>     qemu-kvm package used : qemu-kvm-
>>     Thanks and regards
>>     Akshar
>     I'd say that you should start by updating the OS on both host and
>     guest. Both OSes are heavily outdated, you lack YEARS of updates.

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