Hi Noam,
On 2016-08-17 06:25 AM, Noam Cohen wrote:
Hello
I installed lttng on my ubuntu, and tried the "getting Started".
I ran the helloWorld, and then
$ lttng list --userspace
Error: Unable to list UST events: No session daemon is available
Error: Command error
This looks like a normal error based on the absence of a session daemon.
Waited a minute and retried, and now the output was as expected.
Is it possible you created a session in the mean time ?
The only command that should spawn a session daemon is "lttng create ... ".
Just to make sure this is not simply because sessiond is not ready you
can pass the "-b" option to lttng-sessiond to make sure that the command
line return only when sessiond is ready.
$ lttng list --userspace
UST events:
-------------
PID: 17386 - Name: ./hello
lttng_ust_tracelog:TRACE_DEBUG (loglevel: TRACE_DEBUG (14)) (type:
tracepoint)
< SNIP >
hello_world:my_first_tracepoint (loglevel: TRACE_DEBUG_LINE (13))
(type: tracepoint)
**Is it normal behavior?*
Then,
$ lttng create
Session auto-20160817-132123 created.
Traces will be written in /home/noam/lttng-traces/auto-20160817-132123
noam@noam-nuc:~/tmp/lttng$ lttng enable-event --userspace
hello_world:my_first_tracepoint
Error: Event hello_world:my_first_tracepoint: UST create channel failed
(channel channel0, session auto-20160817-132123)
This is clearly unexpected, logs should provide more information.
How do I solve it?
---------------------
system properties:
noam@noam-nuc:~$ ps -ef | grep lttng
noam 17410 17398 0 13:18 pts/3 00:00:00 lttng-sessiond -vvv
Since you passed the -vvv option could we see the log ?
noam 17411 17410 0 13:18 pts/3 00:00:00 lttng-runas -vvv
noam 17442 17410 0 13:21 pts/3 00:00:00 lttng-consumerd -u
--consumerd-cmd-sock /home/noam/.lttng/ustconsumerd64/command
--consumerd-err-sock /home/noam/.lttng/ustconsumerd64/error --group tracing
noam 17444 17442 0 13:21 pts/3 00:00:00 lttng-runas -u
--consumerd-cmd-sock /home/noam/.lttng/ustconsumerd64/command
--consumerd-err-sock /home/noam/.lttng/ustconsumerd64/error --group tracing
noam 17480 17467 0 13:22 pts/7 00:00:00 grep --color=auto lttng
noam@noam-nuc:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
Installed lttng using:
sudo apt-get install lttng-tools lttng-modules-dkms liblttng-ust-dev
$ lttng --version
lttng (LTTng Trace Control) 2.7.1 - Herbe à Détourne
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--
Jonathan R. Julien
Efficios
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