LTTng not generating trace contents

LTTng not generating trace contents

[Shariyar]

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Hi,

I am having a problem in generating a kernel trace using the latest LTTng
on Ubuntu 12.04. 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.

In particular, I am able to create a session, list all kernel events, start
a trace and stop a trace. My user is also in the tracing group. However,
there are no contents in the trace files generated for every CPU in the
system. Initially, the Babeltrace and the TMF both gave errors and when I
explored the trace folder I found out that they are empty files.The
metadata and index files do show some contents; however, nothing exists in
the channelx_x files.

What would be wrong? Please let me know.

Regards,
Shariyar

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Re: LTTng not generating trace contents

[Antoine Busque]

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On Sun, Jul 6, 2014 at 6:49 PM, Shariyar <syed.shariyar@gmail.com> wrote:

> Hi,
>
> I am having a problem in generating a kernel trace using the latest LTTng
> on Ubuntu 12.04. 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.
>
> In particular, I am able to create a session, list all kernel events,
> start a trace and stop a trace. My user is also in the tracing group.
> However, there are no contents in the trace files generated for every CPU
> in the system. Initially, the Babeltrace and the TMF both gave errors and
> when I explored the trace folder I found out that they are empty files.The
> metadata and index files do show some contents; however, nothing exists in
> the channelx_x files.
>
> What would be wrong? Please let me know.
>
> Regards,
> Shariyar
>
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>
>
Hi,

The stable Ubuntu packages are currently in a not-so-stable state, so you
will probably want to use the packages from the PPA
<https://launchpad.net/~lttng/+archive/ppa>. Make sure to get the
whole toolchain there, and to cleanly uninstall the packages already
present on your machine to avoid any conflicts.

Regards,
Antoine Busque.

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Re: LTTng not generating trace contents

[Thibault, Daniel]

----------------------------------------------------------------------
Date: Sun, 6 Jul 2014 18:49:51 -0400
From: Shariyar <syed.shariyar@gmail.com>

> I am having a problem in generating a kernel trace using the latest LTTng on Ubuntu 12.04.
> 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.
----------------------------------------------------------------------

   Please define what you mean by "the latest LTTng".  What are the versions?  ($ lttng --version, $ lttng-sessiond --version)

Daniel U. Thibault
Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC)
Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS)
RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research Centre
2459 route de la Bravoure
Québec QC  G3J 1X5
CANADA
Vox : (418) 844-4000 x4245
Fax : (418) 844-4538
NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ>
Gouvernement du Canada | Government of Canada
<http://www.valcartier.drdc-rddc.gc.ca/>

Re: LTTng not generating trace contents

[Shariyar]

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 lttng --version,
    lttng (LTTng Trace Control) 2.4.1 - Époque Opaque

 lttng-sessiond --version
    2.4.1


I removed all LTTng packages from the system by manually searching in dpkg
and reinstalled it as follows:
sudo apt-get install lttng-tools lttng-modules-dkms babeltrace

The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu

Now, I get the following error:
sudo lttng list -k
Error: Unable to list kernel events: Kernel tracer not available
Error: Command error

I have encountered this problem on two different systems running Ubuntu
12.04, after the update of system and LTTng

Regards,
Shariyar


On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel <
Daniel.Thibault@drdc-rddc.gc.ca> wrote:

> ----------------------------------------------------------------------
> Date: Sun, 6 Jul 2014 18:49:51 -0400
> From: Shariyar <syed.shariyar@gmail.com>
>
> > I am having a problem in generating a kernel trace using the latest
> LTTng on Ubuntu 12.04.
> > 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.
> ----------------------------------------------------------------------
>
>    Please define what you mean by "the latest LTTng".  What are the
> versions?  ($ lttng --version, $ lttng-sessiond --version)
>
> Daniel U. Thibault
> Protection des systèmes et contremesures (PSC) | Systems Protection &
> Countermeasures (SPC)
> Cyber sécurité pour les missions essentielles (CME) | Mission Critical
> Cyber Security (MCCS)
> RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research
> Centre
> 2459 route de la Bravoure
> Québec QC  G3J 1X5
> CANADA
> Vox : (418) 844-4000 x4245
> Fax : (418) 844-4538
> NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ>
> Gouvernement du Canada | Government of Canada
> <http://www.valcartier.drdc-rddc.gc.ca/>
>

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Re: LTTng not generating trace contents

[Alexandre Montplaisir]

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Hi,

Could you just do
$ sudo apt-get install --reinstall lttng-modules-dkms

and check in the output if you have any errors, or if it really installs 
successfully?

Maybe Ubuntu's patches already trickled down to 12.04 and you might be 
hitting https://bugs.lttng.org/issues/814


Thanks,
Alexandre


On 07/07/2014 01:43 PM, Shariyar wrote:
>   lttng --version,
>      lttng (LTTng Trace Control) 2.4.1 - Époque Opaque
>
>   lttng-sessiond --version
>      2.4.1
>
>
> I removed all LTTng packages from the system by manually searching in dpkg
> and reinstalled it as follows:
> sudo apt-get install lttng-tools lttng-modules-dkms babeltrace
>
> The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu
>
> Now, I get the following error:
> sudo lttng list -k
> Error: Unable to list kernel events: Kernel tracer not available
> Error: Command error
>
> I have encountered this problem on two different systems running Ubuntu
> 12.04, after the update of system and LTTng
>
> Regards,
> Shariyar
>
>
> On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel <
> Daniel.Thibault@drdc-rddc.gc.ca> wrote:
>
>> ----------------------------------------------------------------------
>> Date: Sun, 6 Jul 2014 18:49:51 -0400
>> From: Shariyar <syed.shariyar@gmail.com>
>>
>>> I am having a problem in generating a kernel trace using the latest
>> LTTng on Ubuntu 12.04.
>>> 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.
>> ----------------------------------------------------------------------
>>
>>     Please define what you mean by "the latest LTTng".  What are the
>> versions?  ($ lttng --version, $ lttng-sessiond --version)
>>
>> Daniel U. Thibault
>> Protection des systèmes et contremesures (PSC) | Systems Protection &
>> Countermeasures (SPC)
>> Cyber sécurité pour les missions essentielles (CME) | Mission Critical
>> Cyber Security (MCCS)
>> RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research
>> Centre
>> 2459 route de la Bravoure
>> Québec QC  G3J 1X5
>> CANADA
>> Vox : (418) 844-4000 x4245
>> Fax : (418) 844-4538
>> NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ>
>> Gouvernement du Canada | Government of Canada
>> <http://www.valcartier.drdc-rddc.gc.ca/>
>>
>
>
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev


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Re: LTTng not generating trace contents

[Shariyar]

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No it didn't install correctly.It is generating a crash report and
lttng-module-dkms exists in it too.


Regards,
Shariyar


On Mon, Jul 7, 2014 at 2:04 PM, Alexandre Montplaisir <
alexmonthy@voxpopuli.im> wrote:

>  Hi,
>
> Could you just do
> $ sudo apt-get install --reinstall lttng-modules-dkms
>
> and check in the output if you have any errors, or if it really installs
> successfully?
>
> Maybe Ubuntu's patches already trickled down to 12.04 and you might be
> hitting https://bugs.lttng.org/issues/814
>
>
> Thanks,
> Alexandre
>
>
>
> On 07/07/2014 01:43 PM, Shariyar wrote:
>
>  lttng --version,
>     lttng (LTTng Trace Control) 2.4.1 - Époque Opaque
>
>  lttng-sessiond --version
>     2.4.1
>
>
> I removed all LTTng packages from the system by manually searching in dpkg
> and reinstalled it as follows:
> sudo apt-get install lttng-tools lttng-modules-dkms babeltrace
>
> The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu
>
> Now, I get the following error:
> sudo lttng list -k
> Error: Unable to list kernel events: Kernel tracer not available
> Error: Command error
>
> I have encountered this problem on two different systems running Ubuntu
> 12.04, after the update of system and LTTng
>
> Regards,
> Shariyar
>
>
> On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel <Daniel.Thibault@drdc-rddc.gc.ca> wrote:
>
>
>  ----------------------------------------------------------------------
> Date: Sun, 6 Jul 2014 18:49:51 -0400
> From: Shariyar <syed.shariyar@gmail.com> <syed.shariyar@gmail.com>
>
>  I am having a problem in generating a kernel trace using the latest
>
>  LTTng on Ubuntu 12.04.
>
>  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.
> ----------------------------------------------------------------------
>
>    Please define what you mean by "the latest LTTng".  What are the
> versions?  ($ lttng --version, $ lttng-sessiond --version)
>
> Daniel U. Thibault
> Protection des systèmes et contremesures (PSC) | Systems Protection &
> Countermeasures (SPC)
> Cyber sécurité pour les missions essentielles (CME) | Mission Critical
> Cyber Security (MCCS)
> RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research
> Centre
> 2459 route de la Bravoure
> Québec QC  G3J 1X5
> CANADA
> Vox : (418) 844-4000 x4245
> Fax : (418) 844-4538
> NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> <http://www.travelgis.com/map.asp?addr=918V%20QSDJ>
> Gouvernement du Canada | Government of Canada<http://www.valcartier.drdc-rddc.gc.ca/> <http://www.valcartier.drdc-rddc.gc.ca/>
>
>
>
> _______________________________________________
> lttng-dev mailing listlttng-dev@lists.lttng.orghttp://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>
>
>

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Re: LTTng not generating trace contents

[Alexandre Montplaisir]

Great, thanks for testing, that means we'll have to backport Julien's 
patch to the stable packages earlier than expected!

I'll try to update these this afternoon, I'll keep you posted.

Cheers,
Alexandre

On 07/07/2014 02:11 PM, Shariyar wrote:
> No it didn't install correctly.It is generating a crash report and
> lttng-module-dkms exists in it too.
>
>
> Regards,
> Shariyar
>
>
> On Mon, Jul 7, 2014 at 2:04 PM, Alexandre Montplaisir <
> alexmonthy@voxpopuli.im> wrote:
>
>>   Hi,
>>
>> Could you just do
>> $ sudo apt-get install --reinstall lttng-modules-dkms
>>
>> and check in the output if you have any errors, or if it really installs
>> successfully?
>>
>> Maybe Ubuntu's patches already trickled down to 12.04 and you might be
>> hitting https://bugs.lttng.org/issues/814
>>
>>
>> Thanks,
>> Alexandre
>>
>>
>>
>> On 07/07/2014 01:43 PM, Shariyar wrote:
>>
>>   lttng --version,
>>      lttng (LTTng Trace Control) 2.4.1 - Époque Opaque
>>
>>   lttng-sessiond --version
>>      2.4.1
>>
>>
>> I removed all LTTng packages from the system by manually searching in dpkg
>> and reinstalled it as follows:
>> sudo apt-get install lttng-tools lttng-modules-dkms babeltrace
>>
>> The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu
>>
>> Now, I get the following error:
>> sudo lttng list -k
>> Error: Unable to list kernel events: Kernel tracer not available
>> Error: Command error
>>
>> I have encountered this problem on two different systems running Ubuntu
>> 12.04, after the update of system and LTTng
>>
>> Regards,
>> Shariyar
>>
>>
>> On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel <Daniel.Thibault@drdc-rddc.gc.ca> wrote:
>>
>>
>>   ----------------------------------------------------------------------
>> Date: Sun, 6 Jul 2014 18:49:51 -0400
>> From: Shariyar <syed.shariyar@gmail.com> <syed.shariyar@gmail.com>
>>
>>   I am having a problem in generating a kernel trace using the latest
>>
>>   LTTng on Ubuntu 12.04.
>>
>>   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.
>> ----------------------------------------------------------------------
>>
>>     Please define what you mean by "the latest LTTng".  What are the
>> versions?  ($ lttng --version, $ lttng-sessiond --version)
>>
>> Daniel U. Thibault
>> Protection des systèmes et contremesures (PSC) | Systems Protection &
>> Countermeasures (SPC)
>> Cyber sécurité pour les missions essentielles (CME) | Mission Critical
>> Cyber Security (MCCS)
>> RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research
>> Centre
>> 2459 route de la Bravoure
>> Québec QC  G3J 1X5
>> CANADA
>> Vox : (418) 844-4000 x4245
>> Fax : (418) 844-4538
>> NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> <http://www.travelgis.com/map.asp?addr=918V%20QSDJ>
>> Gouvernement du Canada | Government of Canada<http://www.valcartier.drdc-rddc.gc.ca/> <http://www.valcartier.drdc-rddc.gc.ca/>
>>
>>
>>
>> _______________________________________________
>> lttng-dev mailing listlttng-dev@lists.lttng.orghttp://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>>
>>
>>


_______________________________________________
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Re: LTTng not generating trace contents

[Shariyar]

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Or maybe upgrading to Ubuntu 14.04 could solve this issue as MySQL server
stopped working too in both Ubuntu 12.04 systems.

Regards,
Shariyar


On Mon, Jul 7, 2014 at 2:16 PM, Alexandre Montplaisir <
alexmonthy@voxpopuli.im> wrote:

> Great, thanks for testing, that means we'll have to backport Julien's
> patch to the stable packages earlier than expected!
>
> I'll try to update these this afternoon, I'll keep you posted.
>
> Cheers,
> Alexandre
>
>
> On 07/07/2014 02:11 PM, Shariyar wrote:
>
>> No it didn't install correctly.It is generating a crash report and
>> lttng-module-dkms exists in it too.
>>
>>
>> Regards,
>> Shariyar
>>
>>
>> On Mon, Jul 7, 2014 at 2:04 PM, Alexandre Montplaisir <
>> alexmonthy@voxpopuli.im> wrote:
>>
>>    Hi,
>>>
>>> Could you just do
>>> $ sudo apt-get install --reinstall lttng-modules-dkms
>>>
>>> and check in the output if you have any errors, or if it really installs
>>> successfully?
>>>
>>> Maybe Ubuntu's patches already trickled down to 12.04 and you might be
>>> hitting https://bugs.lttng.org/issues/814
>>>
>>>
>>> Thanks,
>>> Alexandre
>>>
>>>
>>>
>>> On 07/07/2014 01:43 PM, Shariyar wrote:
>>>
>>>   lttng --version,
>>>      lttng (LTTng Trace Control) 2.4.1 - Époque Opaque
>>>
>>>   lttng-sessiond --version
>>>      2.4.1
>>>
>>>
>>> I removed all LTTng packages from the system by manually searching in
>>> dpkg
>>> and reinstalled it as follows:
>>> sudo apt-get install lttng-tools lttng-modules-dkms babeltrace
>>>
>>> The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu
>>>
>>> Now, I get the following error:
>>> sudo lttng list -k
>>> Error: Unable to list kernel events: Kernel tracer not available
>>> Error: Command error
>>>
>>> I have encountered this problem on two different systems running Ubuntu
>>> 12.04, after the update of system and LTTng
>>>
>>> Regards,
>>> Shariyar
>>>
>>>
>>> On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel <
>>> Daniel.Thibault@drdc-rddc.gc.ca> wrote:
>>>
>>>
>>>   ----------------------------------------------------------------------
>>> Date: Sun, 6 Jul 2014 18:49:51 -0400
>>> From: Shariyar <syed.shariyar@gmail.com> <syed.shariyar@gmail.com>
>>>
>>>
>>>   I am having a problem in generating a kernel trace using the latest
>>>
>>>   LTTng on Ubuntu 12.04.
>>>
>>>   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.
>>> ----------------------------------------------------------------------
>>>
>>>     Please define what you mean by "the latest LTTng".  What are the
>>> versions?  ($ lttng --version, $ lttng-sessiond --version)
>>>
>>> Daniel U. Thibault
>>> Protection des systèmes et contremesures (PSC) | Systems Protection &
>>> Countermeasures (SPC)
>>> Cyber sécurité pour les missions essentielles (CME) | Mission Critical
>>> Cyber Security (MCCS)
>>> RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research
>>> Centre
>>> 2459 route de la Bravoure
>>> Québec QC  G3J 1X5
>>> CANADA
>>> Vox : (418) 844-4000 x4245
>>> Fax : (418) 844-4538
>>> NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> <
>>> http://www.travelgis.com/map.asp?addr=918V%20QSDJ>
>>> Gouvernement du Canada | Government of Canada<http://www.valcartier.
>>> drdc-rddc.gc.ca/> <http://www.valcartier.drdc-rddc.gc.ca/>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> lttng-dev mailing listlttng-dev@lists.lttng.orghttp://
>>> lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>>>
>>>
>>>
>>>
>

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Re: LTTng not generating trace contents

[Alexandre Montplaisir]

Alright, the stable- packages have been updated too. It should now be 
possible to install them on recent Ubuntu versions.

Let us know if there are still any issues.

Cheers,
Alexandre


On 07/07/2014 02:16 PM, Alexandre Montplaisir wrote:
> Great, thanks for testing, that means we'll have to backport Julien's 
> patch to the stable packages earlier than expected!
>
> I'll try to update these this afternoon, I'll keep you posted.
>
> Cheers,
> Alexandre
>
> On 07/07/2014 02:11 PM, Shariyar wrote:
>> No it didn't install correctly.It is generating a crash report and
>> lttng-module-dkms exists in it too.
>>
>>
>> Regards,
>> Shariyar
>>
>>
>> On Mon, Jul 7, 2014 at 2:04 PM, Alexandre Montplaisir <
>> alexmonthy@voxpopuli.im> wrote:
>>
>>>   Hi,
>>>
>>> Could you just do
>>> $ sudo apt-get install --reinstall lttng-modules-dkms
>>>
>>> and check in the output if you have any errors, or if it really 
>>> installs
>>> successfully?
>>>
>>> Maybe Ubuntu's patches already trickled down to 12.04 and you might be
>>> hitting https://bugs.lttng.org/issues/814
>>>
>>>
>>> Thanks,
>>> Alexandre
>>>
>>>
>>>
>>> On 07/07/2014 01:43 PM, Shariyar wrote:
>>>
>>>   lttng --version,
>>>      lttng (LTTng Trace Control) 2.4.1 - Époque Opaque
>>>
>>>   lttng-sessiond --version
>>>      2.4.1
>>>
>>>
>>> I removed all LTTng packages from the system by manually searching 
>>> in dpkg
>>> and reinstalled it as follows:
>>> sudo apt-get install lttng-tools lttng-modules-dkms babeltrace
>>>
>>> The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu
>>>
>>> Now, I get the following error:
>>> sudo lttng list -k
>>> Error: Unable to list kernel events: Kernel tracer not available
>>> Error: Command error
>>>
>>> I have encountered this problem on two different systems running Ubuntu
>>> 12.04, after the update of system and LTTng
>>>
>>> Regards,
>>> Shariyar
>>>
>>>
>>> On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel 
>>> <Daniel.Thibault@drdc-rddc.gc.ca> wrote:
>>>
>>>
>>> ----------------------------------------------------------------------
>>> Date: Sun, 6 Jul 2014 18:49:51 -0400
>>> From: Shariyar <syed.shariyar@gmail.com> <syed.shariyar@gmail.com>
>>>
>>>   I am having a problem in generating a kernel trace using the latest
>>>
>>>   LTTng on Ubuntu 12.04.
>>>
>>>   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.
>>> ----------------------------------------------------------------------
>>>
>>>     Please define what you mean by "the latest LTTng".  What are the
>>> versions?  ($ lttng --version, $ lttng-sessiond --version)
>>>
>>> Daniel U. Thibault
>>> Protection des systèmes et contremesures (PSC) | Systems Protection &
>>> Countermeasures (SPC)
>>> Cyber sécurité pour les missions essentielles (CME) | Mission Critical
>>> Cyber Security (MCCS)
>>> RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research
>>> Centre
>>> 2459 route de la Bravoure
>>> Québec QC  G3J 1X5
>>> CANADA
>>> Vox : (418) 844-4000 x4245
>>> Fax : (418) 844-4538
>>> NAC : 918V QSDJ <http://www.travelgis.com/map.asp?addr=918V%20QSDJ> 
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Re: LTTng not generating trace contents

[Thibault, Daniel]

----------------------------------------------------------------------
Date: Mon, 7 Jul 2014 13:43:12 -0400
From: Shariyar <syed.shariyar@gmail.com>
Subject: Re: [lttng-dev] LTTng not generating trace contents

> lttng --version,
>    lttng (LTTng Trace Control) 2.4.1 - ?poque Opaque
>
> lttng-sessiond --version
>    2.4.1
>
> I removed all LTTng packages from the system by manually searching in dpkg and reinstalled it as follows:
> sudo apt-get install lttng-tools lttng-modules-dkms babeltrace
>
> The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu

   What of the liburcu, python-lttng, liblttng-ctl0, liblttng-ctl-dev packages?  I also presume lttng-ust is not involved?  (liburcu is a prime suspect because both kernel and user-space tracing depend on it)

Daniel U. Thibault
Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC)
Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS)
RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research Centre
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