[CentOS-virt] Machine freeze

[Ljubomir Ljubojevic]

Just to make sure, you are using PAExen kernel on 12GB RAM Linux? 4GB is 
  max for regular kernel without PAE extensions.
Mathew S. McCarrell wrote:
> Yeah, the Dom0 should have plenty of memory left since only 2-3 GB of 
> memory is being used out of 12 GB installed.  The out of memory messages 
> were from the domU that I xm consoled into prior to shutting down that 
> particular VM because it was out of memory.
> 
> Matt
> 
> --
> Mathew S. McCarrell
> Clarkson University '10
> 
> mccarrms at gmail.com <mailto:mccarrms at gmail.com>
> mccarrms at clarkson.edu <mailto:mccarrms at clarkson.edu>
> 
> 
> On Wed, Apr 29, 2009 at 3:09 PM, Maros Timko <timkom at gmail.com 
> <mailto:timkom at gmail.com>> wrote:
> 
>     Hi Mathew,
> 
>     I would say no. Our system has freezed completely, it did not
>     reboot. Our issue was caused by concurrent access to scheduler
>     method that created a deadlock.
>     I can see some out of memory messages, do you still have enough
>     memory for Dom0?
> 
>     2009/4/29 Mathew S. McCarrell <mccarrms at gmail.com
>     <mailto:mccarrms at gmail.com>>
> 
>         Hey,
> 
>         I'm wondering if it is possible that your problem is related to
>         mine.  Earlier today I had to restart one of our domUs on one of
>         our systems.  I used xm shutdown instead of xm destroy and then
>         did xm list to determine if the domU had shutdown or not.  Upon
>         issuing xm list a second time, the entire server crashed and
>         rebooted. 
> 
>         I've checked the logs and have yet to find anything.  I've
>         attached a transcript of the commands as I executed them on the
>         server.  The system is running CentOS 5.3 x64 w/Xen (kernel
>         2.6.18-128.1.6.el5xen).
> 
>         Any thoughts?
> 
>         Thanks,
>         Matt
> 
>         --
>         Mathew S. McCarrell
>         Clarkson University '10
> 
>         mccarrms at gmail.com <mailto:mccarrms at gmail.com>
>         mccarrms at clarkson.edu <mailto:mccarrms at clarkson.edu>
> 
> 
>         2009/4/7 Maros Timko <timkom at gmail.com <mailto:timkom at gmail.com>>
> 
>             Hi all,
>              
>             thanks to all for valuable replies.
>             It seems like we identified the issue. We assured that it is
>             not HW related as it was already reproduced on different
>             machines and platforms, with different BIOS versions.
>             We are running a system performance/statistics collector
>             that executes "xentop" command on Dom0 regularly. This is
>             causing issues. If we execute:
>             xentop -b -d 0.1 > /dev/null
>             in multiple instances, it will freeze the system.
>             It was reproduced on CentOS 5.3
>             (kernel-xen-2.6.18-128.1.6.el5) system.
>             There is created a bug for this issue:
>             http://bugs.centos.org/view.php?id=3454
>              
>             With regards,
>              
>             Tino
> 
> 
>             2009/4/3 Maros TIMKO <timko at pobox.sk <mailto:timko at pobox.sk>>
> 
>                 Hi all,
> 
>                 we are running CentOS 5.2 Xen virtualization system with
>                 the latest CentOS packages with couple of VMs on DELL
>                 PowerEdge. "Sometimes" the whole machine freezes without
>                 anything in log files, anything on the console.
>                 "Sometimes" really means we cannot define why or when.
>                 Sometimes the machine was idle with just one VM,
>                 sometimes quite busy with couple of VMs.
> 
>                  Has anybody had the same experience? If yes, any hints
>                 on how to resolve it or how to trace the cause?
> 
>                  
> 
>                 Thanks. 
> 
> 
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