On Wed, Mar 24, 2021 at 03:53:14PM +0000, MONTET Julien wrote: > Hi Jonathan, > > After having written 'sudo systemctl stop lttng-sessiond.service', the > command 'sudo lttng-sessiond -vvv > /tmp/lttng-sessiond.log 2>&1' gives me > nothing.
The log should be in /tmp/lttng-sessiond.log. > > ls -la /var/run/lttng/ : Ubuntu > Pastebin<https://paste.ubuntu.com/p/gjbqKkCrZK/> > groups : Ubuntu Pastebin<https://paste.ubuntu.com/p/pjVFHk7kFZ/> > lttng-sessiond -vvv > /tmp/lttng-sessiond-local.log 2>&1 : nothing > /tmp/lttng-sessiond-local.log : Ubuntu > Pastebin<https://paste.ubuntu.com/p/bj38FhhVpc/> Based on the log there is a sessiond already running... anyway this give us the info we need to know for what socket is made available: application socket path: /home/montetju/.lttng/lttng-ust-sock-8 wait shm path: /lttng-ust-wait-8-1000 Could you share the content of: ls -la /dev/shm 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. Cheers > > The issue persist with the 'lttng list' command. > > Best regards, > > Sorry it was indeed : > The command lines entered to compile are quite the same, I just had to modify > : > > this : gcc -o hello hello.o hello-tp.o -llttng-ust -ldl > > to this : gcc -o hello hello.o hello-tp.o -L/usr/local/lib -llttng-ust -ldl > (I just wanted to focus the importance of -L/usr/local/lib) > > ________________________________ > De : Jonathan Rajotte-Julien <jonathan.rajotte-jul...@efficios.com> > Envoyé : mercredi 24 mars 2021 16:32 > À : MONTET Julien <julien.mon...@reseau.eseo.fr> > Cc : lttng-dev <lttng-dev@lists.lttng.org> > Objet : Re: [lttng-dev] Issues on basic LTTng trace userspace (tutorial) > > Hi Julien, > > Please always keep the mailing list in CC. > > > I am running 'lttng list --userspace' with the application running in > > another terminal (like the tutorial, and also with a while that loop on > > tracepoint(...). > > ok. > > > > > You can find here the Ubuntu paste : Ubuntu > > Pastebin<https://paste.ubuntu.com/p/bWw25kmSTq/> > > Based on this, it seems like lttng-ust is unable to find the socket for a > sessiond either > locally (for your user) [1] or a global one (root lttng-sessiond) [2]. > > [1] 43: libust[207688/207690]: Info: sessiond not accepting connections to > local apps socket (in ust_listener_thread() at lttng-ust-comm.c:1822) > [2] 45: libust[207688/207689]: Info: sessiond not accepting connections to > global apps socket (in ust_listener_thread() at lttng-ust-comm.c:1822) > > Since you installed via the PPA, a systemd service control service is > installed > that control a global (root) lttng-sessiond. > > First let's stop it. > sudo systemctl stop lttng-sessiond.service > > Then in a console, again use a paste service to share the content of > /tmp/lttng-sessiond.log with us > > sudo lttng-sessiond -vvv > /tmp/lttng-sessiond.log 2>&1 > > In another console, while the lttng-sessiond process is running, please have > a look at the /var/run/lttng directory: > > ls -la /var/run/lttng/ > > Again use a paste service to share this with us. > > Also can you provide the output of the following while using the user you are > normally using to play with lttng: > > groups > > You can also try to spawn a local lttng-sessiond for the user. > Note that a global and many local lttng-sessiond can coexist but for the > sake of debugging > we will only have one of each at a time. > > Kill the root lttng-sessiond we started earlier and start a local one: > > lttng-sessiond -vvv > /tmp/lttng-sessiond-local.log 2>&1 > > Note the absence of `sudo` here. > > Again please share the content of /tmp/lttng-sessiond-local.log via a paste > service. > > From there you can retry your experiment with the `lttng list` command. > > Cheers > > > > The command lines entered to compile are quite the same, I just had to > > modify : > > this : gcc -o hello hello.o hello-tp.o > > to this : gcc -o hello hello.o hello-tp.o -L/usr/local/lib -llttng-ust -ldl > > As per the doc [3]: > gcc -o hello hello.o hello-tp.o -llttng-ust -ldl > > [3] https://lttng.org/docs/v2.12/#doc-tracing-your-own-user-application > Bullet point #6 > > Cheers -- Jonathan Rajotte-Julien EfficiOS _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
