[lttng-dev] Tracepoints firing without being enabled in LTTng

[Mosleh Uddin]

That's correct, I don't enable any events or do: lttng start.
Here is some snapshots of starting everything up, followed by starting my
application.
[image: image.png]

Here are the outputs for the commands:

[image: image.png]

[image: image.png]

[image: image.png]

Note that even though the session is inactive, when a trace event occurs in
my application it is being recorded in the appropriate directory:

[image: image.png]

Also maybe important, the system has root only user. Would having the
application belonging to a different user and trying to run as root cause
these kinds of complications? I did notice when testing on a raspberry pi
that running an application as a root user would mean running sessions as
root user as well.

Thanks,
Mosleh

On Fri, Feb 15, 2019 at 11:55 AM Francis Deslauriers <
francis.deslauriers at efficios.com> wrote:

> Adding back lttng-dev mailing list.
>
> So you don't even run a lttng-enable-event command?
> That's odd.
>
> Can you send us the output of the following commands:
> Is it possible that there are other lttng-sessiond daemons running on
> the machine?
> > ps aux | grep "lttng-sessiond"
> Verify if there are other active tracing sessions:
> > lttng list
> Check the details of the current session:
> > lttng status
>
> Thank you,
> Francis
>
> Le ven. 15 févr. 2019, à 11 h 29, Mosleh Uddin <mosleh1235 at gmail.com> a
> écrit :
> >
> > Hi Francis,
> >
> > Thank you for the quick response.
> > Just to clear things up, my application is running when I run that
> command.
> >
> > The commands I am running are:
> > > lttng-sessiond -d
> > > lttng create my-sess --live
> > After this command I start my application. If I then do the command:
> > > lttng view
> > I will see the tracepoints in the application in the terminal even
> though I have not done: lttng start.
> >
> > I thought it was strange that I cannot find my application in the: lttng
> list command under any domain.
> > Also the reason I start my application after creating a session is
> because the system automatically starts the application using systemd,
> > in order to get tracing data at all I have to manually stop the
> application and start it again after creating a session.
> >
> > Thanks again for any help,
> > Mosleh
> >
> > On Fri, Feb 15, 2019 at 10:32 AM Francis Deslauriers <
> francis.deslauriers at efficios.com> wrote:
> >>
> >> Hi Mosleh,
> >> It's expected to not see any event when running lttng list -u if no
> >> lttng-ust instrumented applications are running.
> >>
> >> What are the exact lttng commands you are running to see those
> >> unexpected events?
> >>
> >> Thank you,
> >> Francis
> >>
> >>
> >> Le ven. 15 févr. 2019, à 10 h 08, Mosleh Uddin <mosleh1235 at gmail.com>
> a écrit :
> >> >
> >> > Hello,
> >> >
> >> > I am having a strange issue with my current application. For some
> context, I have integrated LTTng into a Yocto build and put custom trace
> points in my embedded system application. Once I load the built image onto
> my system and start a session daemon, I try to list all available userspace
> events (using lttng list -u), but no events show up.
> >> >
> >> > The strange occurrence is when I create a session (lltng create
> my-sess) and not start tracing the trace events will display on the screen
> regardless (when starting session in live mode with lttng view). I was
> wondering if anyone has any insight on this issue I am having.
> >> >
> >> > Thanks for any assistance,
> >> > Mosleh
> >> > _______________________________________________
> >> > lttng-dev mailing list
> >> > lttng-dev at lists.lttng.org
> >> > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >>
> >> --
> >> Francis Deslauriers
> >> Computer Engineer
> >> EfficiOS inc.
>
>
>
> --
> Francis Deslauriers
> Computer Engineer
> EfficiOS inc.
>
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