<div dir="ltr"><div dir="ltr"><div><br></div><div>Hello,<br></div><div> <p>I'm new to lttng so I tried to follow the 'Quick Start' tutorial from <a href="http://lttng.org">lttng.org</a>.</p>
<p>I have installed LTTng Stable 2.10 PPA (lttng-tools, lttng-modules-dkms, liblttng-ust-dev).
At very beginning I am facing a problem with kernel tracking:</p><pre><code>~/lttng_train$ sudo lttng create my
Session my created.
Traces will be written in /home/szymon/lttng-traces/my-20181130-222008
~/lttng_train$ sudo lttng list --kernel
Error: Unable to list kernel events: Kernel tracer not available
Error: Command error<br></code></pre><p>Any ideas? Thanks for support!</p>
<p>Additional info:</p><pre><code>~/lttng_train$ dpkg -l | grep lttng
ii liblttng-ctl0:amd64 2.10.5-1~ubuntu16.04.1 amd64 LTTng control and utility library
ii liblttng-ust-ctl4:amd64 2.10.2-1~ubuntu16.04.1 amd64 LTTng 2.0 Userspace Tracer (trace control library)
ii liblttng-ust-dev:amd64 2.10.2-1~ubuntu16.04.1 amd64 LTTng 2.0 Userspace Tracer (development files)
ii liblttng-ust-python-agent0:amd64 2.10.2-1~ubuntu16.04.1 amd64 LTTng 2.0 Userspace Tracer (Python agent native library)
ii liblttng-ust0:amd64 2.10.2-1~ubuntu16.04.1 amd64 LTTng 2.0 Userspace Tracer (tracing libraries)
ii lttng-modules-dkms 2.10.8-1~ubuntu16.04.1 all Linux Trace Toolkit (LTTng) kernel modules (DKMS)
ii lttng-tools 2.10.5-1~ubuntu16.04.1 amd64 LTTng control and utility programs
~$ uname -a
Linux szymon 4.4.0-98-generic #121-Ubuntu SMP Tue Oct 10 14:24:03 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
~/lttng_train$ ps aux | grep lttng-sessiond
root 7862 0.0 0.3 859960 10880 ? Ssl 19:12 0:00 /usr/bin/lttng-sessiond
szymon 14853 0.0 0.0 15440 936 pts/1 S+ 22:21 0:00 grep --color=auto lttng-sessiond
~/lttng_train$ lsmod | grep lttng
~/<br><br>~/lttng_train$ sudo lttng-sessiond -vvv<br>DEBUG1 - 00:16:41.328643679 [16578/16578]: [sessiond configuration]<br>DEBUG1 - 00:16:41.328715142 [16578/16578]: verbose: 3<br>DEBUG1 - 00:16:41.328723618 [16578/16578]: verbose consumer: 0<br>DEBUG1 - 00:16:41.328729230 [16578/16578]: quiet mode: False<br>DEBUG1 - 00:16:41.328735428 [16578/16578]: agent_tcp_port: [5345, 5354]<br>DEBUG1 - 00:16:41.328741084 [16578/16578]: application socket timeout: 5<br>DEBUG1 - 00:16:41.328761096 [16578/16578]: no-kernel: False<br>DEBUG1 - 00:16:41.328776829 [16578/16578]: background: False<br>DEBUG1 - 00:16:41.328788328 [16578/16578]: daemonize: False<br>DEBUG1 - 00:16:41.328800092 [16578/16578]: signal parent on start: False<br>DEBUG1 - 00:16:41.328812153 [16578/16578]: tracing group name: tracing<br>DEBUG1 - 00:16:41.328823395 [16578/16578]: kmod_probe_list: None<br>DEBUG1 - 00:16:41.328834022 [16578/16578]: kmod_extra_probe_list: None<br>DEBUG1 - 00:16:41.328848328 [16578/16578]: rundir: /var/run/lttng<br>DEBUG1 - 00:16:41.328857048 [16578/16578]: application socket path: /var/run/lttng/lttng-ust-sock-7<br>DEBUG1 - 00:16:41.328866302 [16578/16578]: client socket path: /var/run/lttng/client-lttng-sessiond<br>DEBUG1 - 00:16:41.328881494 [16578/16578]: wait shm path: /lttng-ust-wait-7<br>DEBUG1 - 00:16:41.328890337 [16578/16578]: health socket path: /var/run/lttng/sessiond-health<br>DEBUG1 - 00:16:41.328896087 [16578/16578]: LTTNG_UST_CLOCK_PLUGIN: None<br>DEBUG1 - 00:16:41.328902562 [16578/16578]: pid file path: /var/run/lttng/lttng-sessiond.pid<br>DEBUG1 - 00:16:41.328909781 [16578/16578]: lock file path: /var/run/lttng/lttng-sessiond.lck<br>DEBUG1 - 00:16:41.328916938 [16578/16578]: session load path: None<br>DEBUG1 - 00:16:41.328924592 [16578/16578]: agent port file path: /var/run/lttng/agent.port<br>DEBUG1 - 00:16:41.328936395 [16578/16578]: consumerd32 path: /var/run/lttng/ustconsumerd32<br>DEBUG1 - 00:16:41.328947517 [16578/16578]: consumerd32 bin path: Unknown<br>DEBUG1 - 00:16:41.328961683 [16578/16578]: consumerd32 lib dir: Unknown<br>DEBUG1 - 00:16:41.328970009 [16578/16578]: consumerd32 err unix sock path:/var/run/lttng/ustconsumerd32/error<br>DEBUG1 - 00:16:41.328977730 [16578/16578]: consumerd32 cmd unix sock path:/var/run/lttng/ustconsumerd32/command<br>DEBUG1 - 00:16:41.328985023 [16578/16578]: consumerd64 path: /var/run/lttng/ustconsumerd64<br>DEBUG1 - 00:16:41.328992714 [16578/16578]: consumerd64 bin path: /usr/lib/x86_64-linux-gnu/lttng/libexec/lttng-consumerd<br>DEBUG1 - 00:16:41.329005793 [16578/16578]: consumerd64 lib dir: /usr/lib/x86_64-linux-gnu<br>DEBUG1 - 00:16:41.329017089 [16578/16578]: consumerd64 err unix sock path:/var/run/lttng/ustconsumerd64/error<br>DEBUG1 - 00:16:41.329028919 [16578/16578]: consumerd64 cmd unix sock path:/var/run/lttng/ustconsumerd64/command<br>DEBUG1 - 00:16:41.329040967 [16578/16578]: kconsumerd path: /var/run/lttng/kconsumerd<br>DEBUG1 - 00:16:41.329053218 [16578/16578]: kconsumerd err unix sock path: /var/run/lttng/kconsumerd/error<br>DEBUG1 - 00:16:41.329064330 [16578/16578]: kconsumerd cmd unix sock path: /var/run/lttng/kconsumerd/command<br>DEBUG3 - 00:16:41.329076040 [16578/16578]: Creating LTTng run directory: /var/run/lttng (in create_lttng_rundir() at main.c:5306)<br>Error: A session daemon is already running.<br>DEBUG1 - 00:16:41.329161207 [16578/16578]: Cleaning up options (in sessiond_cleanup_options() at main.c:648)<br>DEBUG1 - 00:16:41.329178082 [16578/16578]: Destroying run_as worker (in run_as_destroy_worker() at runas.c:709)<br><br></code></pre><pre><code>Regards, <br></code></pre><pre><code>Simon <br></code></pre></div></div></div>