[lttng-dev] Error: Unable to list kernel events: Kernel tracer not available

[François Belias]

Hi Kienan,
 like you asked i stopped all the lttng-sessionds. I did ps aux | grep
lttng-sessiond to locate the processes and sudo kill to terminate them.
When I ran sudo lttng-sessiond I got this error and this warning

Warning: No kernel tracer available

Le ven. 12 juill. 2024, à 16 h 01, Kienan Stewart <kstewart at efficios.com> a
écrit :

> Hi François,
>
> On 7/12/24 3:52 PM, François Belias wrote:
> > Hi Kienan,
> > Yes, `lttng-sessiond` is being run by the root user. I have shared a
> > screenshot of the result when I ran the `lttng-sessiond -vvv` command,
> > but I don't think the kernel modules are loaded.
> > thanks
> >
> >
>
> There are two issues in the screenshot you attached:
>
>    1. You are not starting lttng-sessiond as the root user, you are
> running it as the user 'philippe'
>    2. The error in the screenshot indicates that there is already
> another lttng-sessiond running.
>
> Could you please stop all of the lttng-sessionds, then run
> `lttng-sessiond -vvv` as the root user?
>
> thanks,
> kienan
>
> > Le ven. 12 juill. 2024, à 15 h 24, Kienan Stewart <kstewart at efficios.com
> > <mailto:kstewart at efficios.com>> a écrit :
> >
> >     Hi François,
> >
> >     On 7/12/24 2:53 PM, François Belias via lttng-dev wrote:
> >      > Hello,
> >      >
> >      > When I run the command `sudo lttng list -k`, I get the following
> >     error:
> >
> >     To check a few things:
> >
> >         * Is lttng-sessiond being run by the root user?
> >         * If you run lttng-session with the "-vvv" option, are there
> >     messages
> >     related to loading the kernel modules?
> >         * Once the lttng-sessiond is started, you can check to see if the
> >     kernel modules have been loaded by running the following command:
> >
> >     ```
> >     lsmod | grep lttng
> >     ```
> >
> >     thanks,
> >     kienan
> >
> >      >
> >      > ```
> >      > Error: Unable to list kernel events: Kernel tracer not available.
> >      > ```
> >      >
> >      > I am trying to build LTTng-modules from the source. I followed
> >     the steps
> >      > from this website: [LTTng
> >      >
> >     Documentation](
> https://lttng.org/docs/v2.13/#doc-building-from-source <
> https://lttng.org/docs/v2.13/#doc-building-from-source>
> >      > <https://lttng.org/docs/v2.13/#doc-building-from-source
> >     <https://lttng.org/docs/v2.13/#doc-building-from-source>>), but I
> still
> >      > encounter this error. Can someone help me resolve this issue?
> >      >
> >      > Thanks.
> >      >
> >      > _______________________________________________
> >      > lttng-dev mailing list
> >      > lttng-dev at lists.lttng.org <mailto:lttng-dev at lists.lttng.org>
> >      > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >     <https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>
> >
>
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