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boundary="===============4395551874722504544==" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" --===============4395551874722504544== Content-Language: fr-FR Content-Type: multipart/alternative; boundary="_000_PR3PR02MB620209CCED35CC62E1C8550FD1639PR3PR02MB6202eurp_" --_000_PR3PR02MB620209CCED35CC62E1C8550FD1639PR3PR02MB6202eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Jonathan, After having written 'sudo systemctl stop lttng-sessiond.service', the comm= and 'sudo lttng-sessiond -vvv > /tmp/lttng-sessiond.log 2>&1' gives me noth= ing. ls -la /var/run/lttng/ : Ubuntu Pastebin groups : Ubuntu Pastebin lttng-sessiond -vvv > /tmp/lttng-sessiond-local.log 2>&1 : nothing /tmp/lttng-sessiond-local.log : Ubuntu Pastebin The issue persist with the 'lttng list' command. Best regards, Sorry it was indeed : The command lines entered to compile are quite the same, I just had to modi= fy : > this : gcc -o hello hello.o hello-tp.o -llttng-ust -ldl > to this : gcc -o hello hello.o hello-tp.o -L/usr/local/lib -llttng-ust -l= dl (I just wanted to focus the importance of -L/usr/local/lib) ________________________________ De : Jonathan Rajotte-Julien Envoy=E9 : mercredi 24 mars 2021 16:32 =C0 : MONTET Julien Cc : lttng-dev Objet : Re: [lttng-dev] Issues on basic LTTng trace userspace (tutorial) Hi Julien, Please always keep the mailing list in CC. > I am running 'lttng list --userspace' with the application running in ano= ther terminal (like the tutorial, and also with a while that loop on tracep= oint(...). ok. > > You can find here the Ubuntu paste : Ubuntu Pastebin Based on this, it seems like lttng-ust is unable to find the socket for a s= essiond 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 insta= lled 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/l= ttng-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 hav= e 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 a= re 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 mo= dify : > 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 -l= dl 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 Bul= let point #6 Cheers --_000_PR3PR02MB620209CCED35CC62E1C8550FD1639PR3PR02MB6202eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Jonathan,

After having written 'sudo systemctl stop lttng-sessiond.service', the command 'sudo lttng-session= d -vvv > /tmp/lttng-sessiond.log 2>&1' gives me nothing.
= ls -la /var/run/lttng/ : Ubuntu Pastebin
groups : Ubuntu Pastebin
= lttng-sessiond -vvv > /tmp/lttng-sessiond-local.log 2>&1 : nothing
/tmp/lttng-sessiond-local.log : 
The issue persist with the 'lttng list' command.
=
= Best regards,
=
= Sorry it was indeed : 
= The command lines entered to compile are quite the same, I just had to modify = :
> this :     gcc -o hello hello.o hello-tp.o = ;-llttng-ust -ldl
> to this : gcc -o hello hello.o hello-tp.o -L/usr/local/lib -llttng-ust -ldl
= (I just wanted to focus the importance of  <= b>-L/usr/local/lib)

De : Jonathan Rajotte-Julie= n <jonathan.rajotte-julien@efficios.com>
Envoy=E9 : mercredi 24 mars 2021 16:32
=C0 : MONTET Julien <julien.montet@reseau.eseo.fr>
Cc : lttng-dev <lttng-dev@lists.lttng.org>
Objet : Re: [lttng-dev] Issues on basic LTTng trace userspace (tutor= ial)
 
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 tra= cepoint(...).

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 s= essiond either
locally (for your user) [1] or a global one (root lttng-sessiond) [2].

[1] 43:  libust[207688/207690]: Info: sessiond not accepting connectio= ns to local apps socket (in ust_listener_thread() at lttng-ust-comm.c:1822)=
[2] 45:  libust[207688/207689]: Info: sessiond not accepting connectio= ns 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 insta= lled
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/l= ttng-sessiond.log with us

   sudo lttng-sessiond -vvv > /tmp/lttng-sessiond.log 2>&am= p;1

In another console, while the lttng-sessiond process is running, please hav= e 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 a= re
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 Bul= let point #6

Cheers
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