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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Yaniv,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">See my answers / questions below under [CT].<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Yaniv Kaul [mailto:ykaul@redhat.com]
<br>
<b>Sent:</b> dimanche 13 mars 2016 12:08<br>
<b>To:</b> Christophe TREFOIS <christophe.trefois@uni.lu><br>
<b>Cc:</b> users <users@ovirt.org><br>
<b>Subject:</b> Re: [ovirt-users] VM get stuck randomly<o:p></o:p></span></p>
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<p class="MsoNormal">On Sun, Mar 13, 2016 at 9:46 AM, Christophe TREFOIS <<a href="mailto:christophe.trefois@uni.lu" target="_blank">christophe.trefois@uni.lu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Dear all,<br>
<br>
I have a problem since couple of weeks, where randomly 1 VM (not always the same) becomes completely unresponsive.<br>
We find this out because our Icinga server complains that host is down.<br>
<br>
Upon inspection, we find we can’t open a console to the VM, nor can we login.<o:p></o:p></p>
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<p class="MsoNormal">I assume 3.6's console feature, or is it Spice/VNC?<o:p></o:p></p>
<p class="MsoNormal"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">[CT]
<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">This is 3.5, VNC/Spice yes. Sometimes we can connect, but there’s no way to do anything, eg type or so on.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><br>
</span>In oVirt engine, the VM looks like “up”. The only weird thing is that RAM usage shows 0% and CPU usage shows 100% or 75% depending on number of cores.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Any chance there's really something bad going on within the VM? Anything in its journal or /var/log/messages or ... depending on the OS?<o:p></o:p></p>
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<p class="MsoNormal">Y.<o:p></o:p></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">[CT]
<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">It is possible. It seems to be mostly VMs with Ubuntu 14.04 and latest kernels. I read somewhere, I couldn’t find now, that there’s perhaps a bug in 3.x
kernel with regards to libvirt / vdsm. But my knowledge is too limited to even know where to begin the investigation
</span></i></b><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:Wingdings">J</span></i></b><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">On the VM logs, we just see normal VM stuff, then nothing, and then when the VM was rebooted, there’s a couple of lines of ^@^@^@ characters repeating. But
nothing else really.<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Initially we thought it’s a bug with aufs on Docker, but the machines getting stuck now don’t run either.<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From your answer, I deduce that if vdsm or libvirt or spm would see a problem with storage / memory / cpu, it would suspend the VM and provide that info
to ovirt-engine? <o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Since this is not happening, you think it could be related to the inside of the VM rather than the oVirt environment, correct?<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thank you for your help (especially on a Sunday)
</span></i></b><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:Wingdings">J</span></i></b><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></i></b></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">The only way to recover is to force shutdown the VM via 2-times shutdown from the engine.<br>
<br>
Could you please </span>help me to start debugging this?<br>
I can provide any logs, but I’m not sure which ones, because I couldn’t see anything with ERROR in the vdsm logs on the host.<br>
<br>
The host is running<br>
<br>
OS Version: RHEL - 7 - 1.1503.el7.centos.2.8<br>
Kernel Version: 3.10.0 - 229.14.1.el7.x86_64<br>
KVM Version: 2.1.2 - 23.el7_1.8.1<br>
LIBVIRT Version: libvirt-1.2.8-16.el7_1.4<br>
VDSM Version: vdsm-4.16.26-0.el7.centos<br>
SPICE Version: 0.12.4 - 9.el7_1.3<br>
GlusterFS Version: glusterfs-3.7.5-1.el7<br>
<br>
We use a locally exported gluster as storage domain (eg, storage is on the same machine exposed via gluster). No replica.<br>
We run around 50 VMs on that host.<br>
<br>
Thank you for your help in this,<br>
<br>
—<br>
Christophe<br>
<br>
<br>
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