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boundary="===============6390475812864251316==" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" --===============6390475812864251316== Content-Language: fr-FR Content-Type: multipart/alternative; boundary="_000_PR3PR02MB6202A92FD29EA41CDB8CAE56D1389PR3PR02MB6202eurp_" --_000_PR3PR02MB6202A92FD29EA41CDB8CAE56D1389PR3PR02MB6202eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I installed KeKriek version because it is the one recommanded by the apt-ge= t of Debian Buster 10.9 (LTTng 2.10). Debian -- D=E9tails du paquet lttng-tools dans buster I tried multiple times to install LTTng 2.12 without success, so I stayed i= n LTTng 2.10. Find below the output of : lttng-sessiond -vvv --verbose-consumer https://paste.ubuntu.com/p/NrtyCqhHZc/ (I have got the same with LTTNG_CONSUMERD32_BIN=3D/usr/local/lib32/lttng/li= bexec/lttng-consumerd LTTNG_CONSUMERD32_LIBDIR=3D/usr/local/lib32 lttng-ses= siond -vvv --verbose-consumer) Yes, I had the issue below few days ago with LTTng 2.12 "For 2.12 there is some problems when compiling only lttng-consumerd (fd-tr= acker lib and libcommon problem)." Thank you ! The following modification is working : lttng-sessiond --consumerd32-libdir=3D/usr/local/lib32 --consumerd32-path= =3D/usr/local/lib32/lttng/libexec/lttng-consumerd --daemonize Regards, Julien ________________________________ De : Jonathan Rajotte-Julien Envoy=E9 : lundi 7 juin 2021 17:24 =C0 : MONTET Julien Cc : lttng-dev Objet : Re: [lttng-dev] LTTng 32 bits on 64 bits systems - kernel events...= but no user-event Hi, > I am currently trying to add lttng 32bits on a 64bits system with a custo= m > kernel 4.19.177+ x86_64 (Debian 10.9) > My former attempt only with only a 100% arm32 bits was successful (raspbe= rry). > I am facing now a strange issue : I can record kernel event but not users= pace > event... but I can see these user-event (see below)! Ok. > (tuto : [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%= 2F%2Flttng.org%2Fdocs%2F%23doc-instrumenting-32-bit-app-on-64-bit-system&am= p;data=3D04%7C01%7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d= 929c85983%7C4d7ad1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735252731%7= CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwi= LCJXVCI6Mn0%3D%7C1000&sdata=3D5NB2nNrI17uwSE1Xpn1Uf6sbrRXbEePidPNXUh4ps= 7k%3D&reserved=3D0 > | https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fltt= ng.org%2Fdocs%2F%23doc-instrumenting-32-bit-app-on-64-bit-system&data= =3D04%7C01%7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85= 983%7C4d7ad1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735252731%7CUnkno= wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC= I6Mn0%3D%7C1000&sdata=3D5NB2nNrI17uwSE1Xpn1Uf6sbrRXbEePidPNXUh4ps7k%3D&= amp;reserved=3D0 ] ) > I followed two times the tutorial : on lttng 2.12 and lttng 2.10. > I am on lttng (LTTng Trace Control) 2.10.11 - KeKriek now Any particular reasons? > All installation seemed to install without any error. > The only thing I added is at the very end where I did a : ln -s > /usr/local/bin/lttng /usr/bin/lttng (to directly call commands like "lttn= g > start") > Here some interesting outputs, I am using this projet as an example : [ > https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flttng= .org%2Fdocs%2F%23doc-tracing-your-own-user-application&data=3D04%7C01%7= Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1= 591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZ= sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1= 000&sdata=3D6RTEjlZmpq2CZoIUD%2Fs5ySx60Zqd4JMByVejF8nQ7Vk%3D&reserv= ed=3D0 | > https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flttng= .org%2Fdocs%2F%23doc-tracing-your-own-user-application&data=3D04%7C01%7= Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1= 591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZ= sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1= 000&sdata=3D6RTEjlZmpq2CZoIUD%2Fs5ySx60Zqd4JMByVejF8nQ7Vk%3D&reserv= ed=3D0 ] > lttng list -u : OK [ https://eur02.safelinks.protection.outlook.com/?url= =3Dhttps%3A%2F%2Fpaste.ubuntu.com%2Fp%2FhZptnNzySw%2F&data=3D04%7C01%7C= julien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad15= 91265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZs= b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C10= 00&sdata=3Do71InJDxz1UgYSztgj5ENRr48MmLhsvQvPCO4GeOJ40%3D&reserved= =3D0 | Ubuntu Pastebin ] > LTTNG_UST_DEBUG=3D1 ./hello : seems OK : [ https://eur02.safelinks.protec= tion.outlook.com/?url=3Dhttps%3A%2F%2Fpaste.ubuntu.com%2Fp%2Fw6xHrJsWJ9%2F&= amp;data=3D04%7C01%7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a240= 8d929c85983%7C4d7ad1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680= %7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haW= wiLCJXVCI6Mn0%3D%7C1000&sdata=3D%2FWcFiJDvDaGP0BxZaHVsk7MH91zwvcgmw7vOn= DkkHGg%3D&reserved=3D0 > | Ubuntu Pastebin ] > kernel-event output : [ https://eur02.safelinks.protection.outlook.com/?u= rl=3Dhttps%3A%2F%2Fpaste.ubuntu.com%2Fp%2F5KfyS8wVdb%2F&data=3D04%7C01%= 7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad= 1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbG= Zsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C= 1000&sdata=3DuHI4%2FeLn3gupvZO0DKksc7msLSacG%2Bkp2daShuKr7Wg%3D&res= erved=3D0 | Ubuntu Pastebin > ] > user-event ouput : none - the output folder stated with lttng create > my-user-session --output=3D/tmp/my-user-session doesn't even appear > apt-file search lttng : [ https://eur02.safelinks.protection.outlook.com/= ?url=3Dhttps%3A%2F%2Fpaste.ubuntu.com%2Fp%2FxMcCc7bqwk%2F&data=3D04%7C0= 1%7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7= ad1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFp= bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%= 7C1000&sdata=3D%2BXXEGKYhAexDJnfDDb%2Fc2QjscpT%2FH49pkT0yI%2FlLh8Q%3D&a= mp;reserved=3D0 | Ubuntu > Pastebin ] > lsmod | grep lttng : [ https://eur02.safelinks.protection.outlook.com/?ur= l=3Dhttps%3A%2F%2Fpaste.ubuntu.com%2Fp%2F7YNkNsh9Fr%2F&data=3D04%7C01%7= Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1= 591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZ= sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1= 000&sdata=3DOYHATk5CBw3pIRB9Z3Cw56BiHJCknRzh09s1F%2B4wR%2FY%3D&rese= rved=3D0 | Ubuntu Pastebin > ] Can you provide the config.log from the configure steps We are missing the most important logs: lttng-sessiond. $ lttng-sessiond -vvv --verbose-consumer > Note : file /usr/local/bin/lttng (the exe I am using) gives : > /usr/local/bin/lttng: ELF 64-bit LSB pie executable, x86-64, version 1 (S= YSV), > dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linu= x > 3.2.0, BuildID[sha1]=3D542a108c40e386c17027c2c8f8fcb30e278b7748, with deb= ug_info, > not stripped This is normal. Concretely to support tracing of 32 bit applications only a= 32 bits lttng-consumerd executable is needed which is launched by the lttng-session= d executable. > I am wondering if the installation didn't pick a 64bits RCU and analyses > programms only on this. Hmmm, what indicate this? I seriously doubt that this can happen. > However, I have currently absolutely no idea how to debug this. I decided to do the process on a clean ubuntu 20.04 machine. For 2.12 there is some problems when compiling only lttng-consumerd (fd-tra= cker lib and libcommon problem). I plan on providing a patch shortly. But the major problem is that the path passed at configure time for the ltt= ng-consumerd32 bit daemon are simply not used at runtime. See this bug I just opened [1]. This is valid for 2.10 all the way to maste= r AFAIK. [1] https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fbug= s.lttng.org%2Fissues%2F1318&data=3D04%7C01%7Cjulien.montet%40reseau.ese= o.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247d5bf9%= 7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC= JQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DEV2j354mEqv= EeW46AAnyn7pbutOdn0HtWOjI%2BMbUf3Y%3D&reserved=3D0 In the meantime you will have to pass the lttng-consumerd 32 bit path as ar= gument or env variables to lttng-sessiond as such: $ lttng-sessiond -vvv --verbose-consumer --consumerd32-libdir=3D/usr/local/= lib32 --consumerd32-path=3D/usr/local/lib32/lttng/libexec/lttng-consumerd or $ LTTNG_CONSUMERD32_BIN=3D/usr/local/lib32/lttng/libexec/lttng-consumerd LT= TNG_CONSUMERD32_LIBDIR=3D/usr/local/lib32 lttng-sessiond -vvv --verbose-con= sumer >From there the 32bits application is traced correctly and data is gathered = without any problem (at least on 2.12). ``` [15:22:24.500655502] (+?.?????????) ubuntu2004.localdomain lttng_ust_stated= ump:start: { cpu_id =3D 3 }, { } [15:22:24.500661538] (+0.000006036) ubuntu2004.localdomain lttng_ust_stated= ump:procname: { cpu_id =3D 3 }, { procname =3D "hello" } [15:22:24.502611224] (+0.001949686) ubuntu2004.localdomain lttng_ust_stated= ump:bin_info: { cpu_id =3D 3 }, { baddr =3D 0xF7EC9000, memsz =3D 20596, pa= th =3D "/usr/lib32/libdl-2.31.so", is_pic =3D 1, has_build_id =3D 1, has_de= bug_link =3D 1 } [15:22:24.502614501] (+0.000003277) ubuntu2004.localdomain lttng_ust_stated= ump:build_id: { cpu_id =3D 3 }, { baddr =3D 0xF7EC9000, _build_id_length = =3D 20, build_id =3D [ [0] =3D 0x75, [1] =3D 0x1E, [2] =3D 0xDD, [3] =3D 0x= 47, [4] =3D 0x72, [5] =3D 0x3, [6] ``` Cheers --_000_PR3PR02MB6202A92FD29EA41CDB8CAE56D1389PR3PR02MB6202eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi,

I installed KeKriek version because it is the one recommanded by the apt= -get of Debian Buster 10.9 (LTTng 2.10).
I tried multiple times to install LTTng 2.12 without success, so I staye= d in LTTng 2.10.

Find below the output of :  lttng-sessiond -vvv --verbose-consumer

(I have got the same with LTTNG_CONSUMERD32_BIN=3D/usr/local/lib32= /lttng/libexec/lttng-consumerd LTTNG_CONSUMERD32_LIBDIR=3D/usr/local/lib32 lttng-sessiond -vvv --verbose-= consumer)

Yes, I= had the issue below few days ago with LTTng 2.12
"For 2.12 there is some problems when compiling only lttng-consumerd (fd-tracker lib and libcommon= problem)."

Thank you ! The following modification is working :
lttng-sessiond --consumerd32-libdir=3D/usr/local/lib32 --consumerd32-path=3D/usr/local/li= b32/lttng/libexec/lttng-consumerd --daemonize

Regards,

Julien

De : Jonathan Rajotte-Julie= n <jonathan.rajotte-julien@efficios.com>
Envoy=E9 : lundi 7 juin 2021 17:24
=C0 : MONTET Julien <julien.montet@reseau.eseo.fr>
Cc : lttng-dev <lttng-dev@lists.lttng.org>
Objet : Re: [lttng-dev] LTTng 32 bits on 64 bits systems - kernel ev= ents... but no user-event
 
Hi,

> I am currently trying to add lttng 32bits on a 64bits system with a cu= stom
> kernel 4.19.177+ x86_64 (Debian 10.9)
> My former attempt only with only a 100% arm32 bits was successful (ras= pberry).
> I am facing now a strange issue : I can record kernel event but not us= erspace
> event... but I can see these user-event (see below)!

Ok.

> (tuto : [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flttng.o= rg%2Fdocs%2F%23doc-instrumenting-32-bit-app-on-64-bit-system&amp;data= =3D04%7C01%7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85= 983%7C4d7ad1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735252731%7CUnkno= wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC= I6Mn0%3D%7C1000&amp;sdata=3D5NB2nNrI17uwSE1Xpn1Uf6sbrRXbEePidPNXUh4ps7k= %3D&amp;reserved=3D0
> | https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flttng.o= rg%2Fdocs%2F%23doc-instrumenting-32-bit-app-on-64-bit-system&amp;data= =3D04%7C01%7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85= 983%7C4d7ad1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735252731%7CUnkno= wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC= I6Mn0%3D%7C1000&amp;sdata=3D5NB2nNrI17uwSE1Xpn1Uf6sbrRXbEePidPNXUh4ps7k= %3D&amp;reserved=3D0 ] )

> I followed two times the tutorial : on lttng 2.12 and lttng 2.10.
> I am on lttng (LTTng Trace Control) 2.10.11 - KeKriek now

Any particular reasons?

> All installation seemed to install without any error.
> The only thing I added is at the very end where I did a : ln -s
> /usr/local/bin/lttng /usr/bin/lttng (to directly call commands like &q= uot;lttng
> start")

> Here some interesting outputs, I am using this projet as an example : = [
> https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flttng.o= rg%2Fdocs%2F%23doc-tracing-your-own-user-application&amp;data=3D04%7C01= %7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7a= d1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpb= GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C1000&amp;sdata=3D6RTEjlZmpq2CZoIUD%2Fs5ySx60Zqd4JMByVejF8nQ7Vk%3D&= amp;reserved=3D0 |
> https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flttng.o= rg%2Fdocs%2F%23doc-tracing-your-own-user-application&amp;data=3D04%7C01= %7Cjulien.montet%40reseau.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7a= d1591265437ab9f62946247d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpb= GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C1000&amp;sdata=3D6RTEjlZmpq2CZoIUD%2Fs5ySx60Zqd4JMByVejF8nQ7Vk%3D&= amp;reserved=3D0 ]
> lttng list -u : OK [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fpaste.u= buntu.com%2Fp%2FhZptnNzySw%2F&amp;data=3D04%7C01%7Cjulien.montet%40rese= au.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247= d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw= MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3Do= 71InJDxz1UgYSztgj5ENRr48MmLhsvQvPCO4GeOJ40%3D&amp;reserved=3D0 | Ubuntu Pastebin ]
> LTTNG_UST_DEBUG=3D1 ./hello : seems OK : [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fpaste.u= buntu.com%2Fp%2Fw6xHrJsWJ9%2F&amp;data=3D04%7C01%7Cjulien.montet%40rese= au.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247= d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw= MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D%= 2FWcFiJDvDaGP0BxZaHVsk7MH91zwvcgmw7vOnDkkHGg%3D&amp;reserved=3D0 > | Ubuntu Pastebin ]
> kernel-event output : [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fpaste.u= buntu.com%2Fp%2F5KfyS8wVdb%2F&amp;data=3D04%7C01%7Cjulien.montet%40rese= au.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247= d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw= MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3Du= HI4%2FeLn3gupvZO0DKksc7msLSacG%2Bkp2daShuKr7Wg%3D&amp;reserved=3D0 | Ubuntu Pastebin
> ]
> user-event ouput : none - the output folder stated with lttng create > my-user-session --output=3D/tmp/my-user-session doesn't even appear > apt-file search lttng : [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fpaste.u= buntu.com%2Fp%2FxMcCc7bqwk%2F&amp;data=3D04%7C01%7Cjulien.montet%40rese= au.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247= d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw= MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D%= 2BXXEGKYhAexDJnfDDb%2Fc2QjscpT%2FH49pkT0yI%2FlLh8Q%3D&amp;reserved=3D0<= /a> | Ubuntu
> Pastebin ]
> lsmod | grep lttng : [ https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fpaste.u= buntu.com%2Fp%2F7YNkNsh9Fr%2F&amp;data=3D04%7C01%7Cjulien.montet%40rese= au.eseo.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247= d5bf9%7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw= MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DO= YHATk5CBw3pIRB9Z3Cw56BiHJCknRzh09s1F%2B4wR%2FY%3D&amp;reserved=3D0 | Ubuntu Pastebin
> ]

Can you provide the config.log from the configure steps

We are missing the most important logs: lttng-sessiond.

$ lttng-sessiond -vvv --verbose-consumer

> Note : file /usr/local/bin/lttng (the exe I am using) gives :
> /usr/local/bin/lttng: ELF 64-bit LSB pie executable, x86-64, version 1= (SYSV),
> dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/L= inux
> 3.2.0, BuildID[sha1]=3D542a108c40e386c17027c2c8f8fcb30e278b7748, with = debug_info,
> not stripped

This is normal. Concretely to support tracing of 32 bit applications only a= 32 bits
lttng-consumerd executable is needed which is launched by the lttng-session= d executable.

> I am wondering if the installation didn't pick a 64bits RCU and analys= es
> programms only on this.

Hmmm, what indicate this? I seriously doubt that this can happen.

> However, I have currently absolutely no idea how to debug this.

I decided to do the process on a clean ubuntu 20.04 machine.
For 2.12 there is some problems when compiling only lttng-consumerd (fd-tra= cker lib and libcommon problem). I plan on providing a patch shortly.

But the major problem is that the path passed at configure time for the ltt= ng-consumerd32 bit daemon are simply not used at runtime.
See this bug I just opened [1]. This is valid for 2.10 all the way to maste= r AFAIK.

[1] https://eur02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fbugs.lt= tng.org%2Fissues%2F1318&amp;data=3D04%7C01%7Cjulien.montet%40reseau.ese= o.fr%7C9b85f601067749845a2408d929c85983%7C4d7ad1591265437ab9f62946247d5bf9%= 7C0%7C0%7C637586762735262680%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC= JQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DEV2j354= mEqvEeW46AAnyn7pbutOdn0HtWOjI%2BMbUf3Y%3D&amp;reserved=3D0

In the meantime you will have to pass the lttng-consumerd 32 bit path as ar= gument or env variables to lttng-sessiond as such:

$ lttng-sessiond -vvv --verbose-consumer --consumerd32-libdir=3D/usr/local/= lib32 --consumerd32-path=3D/usr/local/lib32/lttng/libexec/lttng-consumerd
or

$ LTTNG_CONSUMERD32_BIN=3D/usr/local/lib32/lttng/libexec/lttng-consumerd LT= TNG_CONSUMERD32_LIBDIR=3D/usr/local/lib32 lttng-sessiond -vvv --verbose-con= sumer


>From there the 32bits application is traced correctly and data is gathered = without any problem (at least on 2.12).


```
[15:22:24.500655502] (+?.?????????) ubuntu2004.localdomain lttng_ust_stated= ump:start: { cpu_id =3D 3 }, { }
[15:22:24.500661538] (+0.000006036) ubuntu2004.localdomain lttng_ust_stated= ump:procname: { cpu_id =3D 3 }, { procname =3D "hello" }
[15:22:24.502611224] (+0.001949686) ubuntu2004.localdomain lttng_ust_stated= ump:bin_info: { cpu_id =3D 3 }, { baddr =3D 0xF7EC9000, memsz =3D 20596, pa= th =3D "/usr/lib32/libdl-2.31.so", is_pic =3D 1, has_build_id =3D= 1, has_debug_link =3D 1 }
[15:22:24.502614501] (+0.000003277) ubuntu2004.localdomain lttng_ust_stated= ump:build_id: { cpu_id =3D 3 }, { baddr =3D 0xF7EC9000, _build_id_length = =3D 20, build_id =3D [ [0] =3D 0x75, [1] =3D 0x1E, [2] =3D 0xDD, [3] =3D 0x= 47, [4] =3D 0x72, [5] =3D 0x3, [6]
```

Cheers
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