Hi Julien, > TBH nothing points toward a problem here. I would need to spawn a 20.04 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 ppa 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-ust-dev >From there all the steps for building the userspace application works without 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 communicate with one. Note that the user I am using here (vagrant) is not part of the "tracing" 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 that this is not required for day to day tracing since a running app will connect itself and only for debugging purpose): lttng-sessiond -b LTTNG_UST_DEBUG=1 ./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 _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
