<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 13, 2016 at 1:14 PM, Christophe TREFOIS <span dir="ltr"><<a href="mailto:christophe.trefois@uni.lu" target="_blank">christophe.trefois@uni.lu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi Yaniv,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">See my answers / questions below under [CT].<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></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:<a href="mailto:ykaul@redhat.com" target="_blank">ykaul@redhat.com</a>]
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<b>Sent:</b> dimanche 13 mars 2016 12:08<br>
<b>To:</b> Christophe TREFOIS <<a href="mailto:christophe.trefois@uni.lu" target="_blank">christophe.trefois@uni.lu</a>><br>
<b>Cc:</b> users <<a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a>><br>
<b>Subject:</b> Re: [ovirt-users] VM get stuck randomly<u></u><u></u></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:<u></u><u></u></p>
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<p class="MsoNormal">Dear all,<br>
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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>
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Upon inspection, we find we can’t open a console to the VM, nor can we login.<u></u><u></u></p>
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<p class="MsoNormal">I assume 3.6's console feature, or is it Spice/VNC?<u></u><u></u></p>
</span><p class="MsoNormal"><b><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">[CT]
<u></u><u></u></span></i></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></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.<u></u><u></u></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <u></u><u></u></span></p>
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</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.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></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?<u></u><u></u></p>
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<p class="MsoNormal">Y.<u></u><u></u></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">[CT]
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<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"><u></u><u></u></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></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.<u></u><u></u></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.<u></u><u></u></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></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? <u></u><u></u></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?</span></i></b></p></div></div></div></div></div></div></div></blockquote><div><br></div><div>Either that, or to libvirt/QEMU.</div><div>I suggest, if possible, to upgrade the components first to newer versions (as Nir suggested).</div><div>Y.</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="FR-LU" link="blue" vlink="purple"><div><div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt"><div><div><div><div><p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u><u></u></span></i></b></p>
<p class="MsoNormal"><b><i><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></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"><u></u><u></u></span></i></b></p>
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<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <u></u><u></u></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>
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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>
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The host is running<br>
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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>
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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>
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Thank you for your help in this,<br>
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—<br>
Christophe<br>
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