This email is not from Hexagon’s Office 365 instance. Please be careful while clicking links, opening attachments, or replying to this email.
Hi Moritz
What is your version of lttng-tools?
lttng --version
Please run the `hello` executable using the LTTNG_UST_DEBUG env variable, while
tracing, and provide the output.
pkill lttng-sessiond
lttng-sessiond -b -vvv --verbose-consumer 2> /tmp/lttng-sessiond.log
lttng create
lttng enable-event -u -a
lttng start
LTTNG_UST_DEBUG=y ./hello
lttng stop
lttng destroy
pkill lttng-sessiond
Please also provide the /tmp/lttng-sessiond.log file via pastebin.
I suspect that if you cross-compiled lttng-ust from the master branch that
lttng-tools is not using the same version, resulting in the application not
being able to register to the lttng-sessiond.
Cheers
On Mon, Aug 03, 2020 at 09:35:25AM +0000, PFLANZER Moritz via lttng-dev wrote:
> Hi all!
>
> I'm struggling to get userspace tracing working on an aarch64 platform (busybox on top of Linux 5.4.24 kernel). I followed the guidelines in the docs and am currently using this example program for testing:
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flttng%2Flttng-ust%2Ftree%2Fmaster%2Fdoc%2Fexamples%2Fhello-static-lib&data=02%7C01%7C%7Ce141a6eb68ea4d4c93c508d837c25b99%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637320655210160415&sdata=lPbFWob0G4U22ncUmqfz12Ha42xOymctYWCOJC34oC8%3D&reserved=0
> I cross-compiled lttng-ust and that example, but when I run the following commands on the platform no traces are recorded. If I use the same example on my x86 machine everything works as expected. (And kernelspace tracing is working on that aarch64 system.)
>
> Any hints where I could start investigating the issue are welcome.
>
> Regards,
> Moritz
>
> ~ # pwd
> /root
> ~ # lttng create
> Spawning a session daemon
> Session auto-20200720-174509 created.
> Traces will be written in /root/lttng-traces/auto-20200720-174509
> ~ # lttng enable-event -au
> All UST events are enabled in channel channel0
> ~ # lttng start
> Tracing started for session auto-20200720-174509
> ~ # ./hello
> Hello, World!
> Tracing... done.
> ~ # lttng destroy
> Session auto-20200720-174509 destroyed
> ~ # ll
> total 40
> -rwxr-xr-x 1 root root 39280 Jul 20 17:44 hello*
>
>
>
> Moritz Pflanzer
> Software Development Engineer
>
> [cid:image001.png@01D3BF6E.185110B0]
>
> Räffelstrasse 28
>
> 8045 Zürich
> E: moritz.pflanzer@hexagon.com<mailto:moritz.pflanzer@hexagon.com><mailto:carolin.siebert@hexagon.com>
> W:
http://www.hexagongeosystems.com/
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
>
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.lttng.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Flttng-dev&data=02%7C01%7C%7Ce141a6eb68ea4d4c93c508d837c25b99%7C1b16ab3eb8f64fe39f3e2db7fe549f6a%7C0%7C0%7C637320655210160415&sdata=bH0laqzT2Hl5nQw1qTxubC6PMyzsthqYZ5gOa4VyxAA%3D&reserved=0
--
Jonathan Rajotte-Julien
EfficiOS