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boundary="===============5872813690948419241==" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" --===============5872813690948419241== Content-Language: fr-FR Content-Type: multipart/alternative; boundary="_000_PR3PR02MB6202B24C2EBFF492A659DFF1D1639PR3PR02MB6202eurp_" --_000_PR3PR02MB6202B24C2EBFF492A659DFF1D1639PR3PR02MB6202eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Jonathan, You are absolutely right ! I have two different lttng : find /usr -name "*liblttng-ust*" Ubuntu Past= ebin According to you, what would be the best solution to solve this issue ? I have indeed a folder named lttng-ust where I have made the (wrong) config= ure / make. I tried to (temporary) remove all the libttng* /usr/local/lib/, but I face = this problem : /usr/bin/ld: hello-tp.o: in function `__lttng_events_init__hello_world': hello-tp.c:(.text+0xe56): undefined reference to `lttng_ust_probe_register' /usr/bin/ld: hello-tp.o: in function `__lttng_events_exit__hello_world': hello-tp.c:(.text+0xeb2): undefined reference to `lttng_ust_probe_unregiste= r' collect2: error: ld returned 1 exit status In the worst case scenario I am able to get my last clean snapchot. What would you advise me to do ? Cheers, ________________________________ De : Jonathan Rajotte-Julien Envoy=E9 : mercredi 24 mars 2021 17:36 =C0 : MONTET Julien Cc : lttng-dev Objet : Re: [lttng-dev] Issues on basic LTTng trace userspace (tutorial) Hi Julien, > TBH nothing points toward a problem here. I would need to spawn a 20.04 t= o check > if something is broken, I might have time later today. Finally I had a Vagrant definition file laying around for the stable-2.12 p= pa that let me bring up a vm easily. All seems fine. How lttng is installed: add-apt-repository ppa:lttng/stable-2.12 -y apt-get update apt-get install -y lttng-tools lttng-modules-dkms babeltrace2 liblttng-us= t-dev >From there all the steps for building the userspace application works witho= ut ANY modifications. The app is able to connect itself to the global sessiond: https://paste.ubu= ntu.com/p/QnfqbtgpFF/ Note that no local sessiond is present hence why the app does not communica= te with one. Note that the user I am using here (vagrant) is not part of the "tracing" g= roup hence the user cannot interact with the global sessiond. Such scenario return the following: vagrant@ubuntu2004:~$ lttng list -u Error: Unable to list UST events: No session daemon is available Now let's start a lttng-sessiond for the user and restart our app (note tha= t this is not required for day to day tracing since a running app will connec= t itself and only for debugging purpose): lttng-sessiond -b LTTNG_UST_DEBUG=3D1 ./hello Yielding: https://paste.ubuntu.com/p/MsnHt94FXZ/ Now the app is connected to both sessiond. Now the user can list the event against the local lttng-sessiond: vagrant@ubuntu2004:~$ lttng list -u UST events: ------------- PID: 15429 - Name: ./hello lttng_ust_tracelog:TRACE_DEBUG (loglevel: TRACE_DEBUG (14)) (type: = tracepoint) lttng_ust_tracelog:TRACE_DEBUG_LINE (loglevel: TRACE_DEBUG_LINE (13= )) (type: tracepoint) So based on this I would say that either we are not given the full picture = of what is going on or there is a step you are missing. One explication would = be that you end up linking against a older lttng-ust without knowing it. Please run this an provide the output via a paste service: find /usr -name "*liblttng-ust*" For example on my VM: https://paste.ubuntu.com/p/Tjxn3V7g5j/ Cheers -- Jonathan Rajotte-Julien EfficiOS --_000_PR3PR02MB6202B24C2EBFF492A659DFF1D1639PR3PR02MB6202eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Jonathan,

You are absolutely right !
I have two different lttng :   find /usr -name "*liblttng-ust*" Ubuntu Pastebin

According to you, what would be the best solution to solve this issue ?

I have indeed a folder named lttng-ust where I have made the (wrong) config= ure / make.

I tried to (temporary) remove all the libttng* /usr/local/lib/, but I face = this problem : 
/usr/bin/ld: hello-tp.o: in function `__lttng_events_init__hello_world':
hello-tp.c:(.text+0xe56): undefined reference to `lttng_ust_probe_regi= ster'
/usr/bin/ld: hello-tp.o: in function `__lttng_events_exit__hello_world= ':
hello-tp.c:(.text+0xeb2): undefined reference to `lttng_ust_probe_unre= gister'
collect2: error: ld returned 1 exit status

In the worst case scenario I am able to get my last clean snapchot.

What would you advise me to do ?

Cheers,

De : Jonathan Rajotte-Julie= n <jonathan.rajotte-julien@efficios.com>
Envoy=E9 : mercredi 24 mars 2021 17:36
=C0 : MONTET Julien <julien.montet@reseau.eseo.fr>
Cc : lttng-dev <lttng-dev@lists.lttng.org>
Objet : Re: [lttng-dev] Issues on basic LTTng trace userspace (tutor= ial)
 
Hi Julien,

> TBH nothing points toward a problem here. I would need to spawn a 20.0= 4 to check
> if something is broken, I might have time later today.

Finally I had a Vagrant definition file laying around for the stable-2.12 p= pa
that let me bring up a vm easily. All seems fine.

How lttng is installed:

  add-apt-repository ppa:lttng/stable-2.12 -y
  apt-get update
  apt-get install -y lttng-tools lttng-modules-dkms babeltrace2 libltt= ng-ust-dev

>From there all the steps for building the userspace application works witho= ut
ANY modifications.

The app is able to connect itself to the global sessiond: https://paste.ubuntu.com/p/QnfqbtgpFF/

Note that no local sessiond is present hence why the app does not communica= te
with one.

Note that the user I am using here (vagrant) is not part of the "traci= ng" group
hence the user cannot interact with the global sessiond.

Such scenario return the following:

  vagrant@ubuntu2004:~$ lttng list -u
  Error: Unable to list UST events: No session daemon is available

Now let's start a lttng-sessiond for the user and restart our app (note tha= t
this is not required for day to day tracing since a running app will connec= t
itself and only for debugging purpose):

 lttng-sessiond -b
 LTTNG_UST_DEBUG=3D1 ./hello

Yielding: https://paste.= ubuntu.com/p/MsnHt94FXZ/

Now the app is connected to both sessiond.

Now the user can list the event against the local lttng-sessiond:

  vagrant@ubuntu2004:~$ lttng list -u
  UST events:
  -------------
 
  PID: 15429 - Name: ./hello
        lttng_ust_tracelog:TRACE_DEBUG (= loglevel: TRACE_DEBUG (14)) (type: tracepoint)
        lttng_ust_tracelog:TRACE_DEBUG_L= INE (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)


So based on this I would say that either we are not given the full picture = of
what is going on or there is a step you are missing. One explication would = be
that you end up linking against a older lttng-ust without knowing it.

Please run this an provide the output via a paste service:

   find /usr -name "*liblttng-ust*"

For example on my VM: ht= tps://paste.ubuntu.com/p/Tjxn3V7g5j/

Cheers

--
Jonathan Rajotte-Julien
EfficiOS
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