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 _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
