<div dir="ltr"><div><span style="font-family:arial,sans-serif;font-size:13px"> lttng --version,</span><br></div><div> lttng (LTTng Trace Control) 2.4.1 - Époque Opaque</div><div><br></div><div><span style="font-family:arial,sans-serif;font-size:13px"> lttng-sessiond --version</span><br>
</div><div><span style="font-family:arial,sans-serif;font-size:13px"> 2.4.1</span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div><span style="font-family:arial,sans-serif;font-size:13px">I removed all LTTng packages from the system by manually searching in dpkg and reinstalled it as follows:</span></div><div><span style="color:rgb(51,51,51);font-family:monospace;font-size:12px;line-height:18px">sudo apt-get install lttng-tools lttng-modules-dkms babeltrace</span><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div><div><span style="color:rgb(51,51,51);font-family:monospace;font-size:12px;line-height:18px"><br></span></div><div><span style="color:rgb(51,51,51);font-family:monospace;font-size:12px;line-height:18px">The ppa in the system is: </span><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px"><a href="http://ppa.launchpad.net/lttng/ppa/ubuntu" target="_blank">http://ppa.launchpad.net/lttng/ppa/ubuntu</a></span></font></div>
<div><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px"><br></span></font></div><div><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px">Now, I get the following error:</span></font></div>
<div><font color="#333333" face="monospace"><div style><span style="line-height:18px">sudo lttng list -k</span></div><div style><span style="line-height:18px">Error: Unable to list kernel events: Kernel tracer not available</span></div>
<div style><span style="line-height:18px">Error: Command error</span></div><div style="font-size:12px;line-height:18px"><br></div></font></div>
<div><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px">I have encountered this problem on two different systems running Ubuntu 12.04, after the update of system and LTTng</span></font></div>
<div><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px"><br></span></font></div><div><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px">Regards,</span></font></div>
<div><font color="#333333" face="monospace"><span style="font-size:12px;line-height:18px">Shariyar</span></font></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel <span dir="ltr"><<a href="mailto:Daniel.Thibault@drdc-rddc.gc.ca" target="_blank">Daniel.Thibault@drdc-rddc.gc.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">----------------------------------------------------------------------<br>
Date: Sun, 6 Jul 2014 18:49:51 -0400<br>
From: Shariyar <<a href="mailto:syed.shariyar@gmail.com">syed.shariyar@gmail.com</a>><br>
<div class=""><br>
> I am having a problem in generating a kernel trace using the latest LTTng on Ubuntu 12.04.<br>
> It was working fine previously but when I updated LTTng it stopped generating the trace contents. I did an uninstall and reinstall but it didn't work either.<br>
</div>----------------------------------------------------------------------<br>
<br>
Please define what you mean by "the latest LTTng". What are the versions? ($ lttng --version, $ lttng-sessiond --version)<br>
<br>
Daniel U. Thibault<br>
Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC)<br>
Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS)<br>
RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research Centre<br>
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Gouvernement du Canada | Government of Canada<br>
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</blockquote></div><br></div>