[lttng-dev] No trace files are generated for UST

[David Goulet]

On 07 Dec (06:16:14), Manikandan Govindaswamy wrote:
> Please find the log for the --verbose-consumer attached.

With the log file you provided, *no* application registered to the
session daemon meaning probably that lttng-ust is either not called or
not linked at all.

By adding this in front, you should have quite an amount of debug being
printed out on stderr. If not, you have a problem with maybe the
LD_PRELOAD path or lttng-ust linking else provide those logs :).

LTTNG_UST_DEBUG=1 ./sample

Cheers!
David

> 
> Regards,
> GMK.
> 
> -----Original Message-----
> From: jeremie.galarneau at gmail.com [mailto:jeremie.galarneau at gmail.com] On Behalf Of Jérémie Galarneau
> Sent: Friday, December 06, 2013 11:23 PM
> To: Manikandan Govindaswamy
> Cc: Thibault, Daniel; lttng-dev at lists.lttng.org
> Subject: Re: [lttng-dev] No trace files are generated for UST
> 
> Could you launch the session daemon in verbose mode and post the logs?
> 
> lttng-sessiond -vvv --verbose-consumer
> 
> On Fri, Dec 6, 2013 at 10:51 AM, Manikandan Govindaswamy
> <magov at vestas.com> wrote:
> > Yes, with that LD_PRELOAD sample able to run.
> >
> > root@/tmp/lttng-build-root/bin # ./lttng create app
> > Session app created.
> > Traces will be written in /root/lttng-traces/app-20131206-174935
> > root@/tmp/lttng-build-root/bin # dmesg
> > root@/tmp/lttng-build-root/bin # ./lttng enable-event -u -a
> > All UST events are enabled in channel channel0
> > root@/tmp/lttng-build-root/bin # ./lttng start
> > Tracing started for session app
> > root@/tmp/lttng-build-root/bin # cd ..
> > root@/tmp/lttng-build-root # cd ..
> > root@/tmp # LD_PRELOAD=/tmp/lttng-build-root/lib/liblttng-ust.so.0 ./sample
> > root@/tmp #
> > root@/tmp #
> > root@/tmp # cd lttng-build-root/
> > root@/tmp/lttng-build-root # cd bin/
> > root@/tmp/lttng-build-root/bin # ./lttng stop
> > Waiting for data availability
> > Tracing stopped for session app
> > root@/tmp/lttng-build-root/bin # dmesg
> > root@/tmp/lttng-build-root/bin # ./lttng destroy
> > Session app destroyed
> > root@/tmp/lttng-build-root/bin # cd /
> > root@/ # cd root/
> > root@~ # ls
> > lttng-traces
> > root@~ # cd lttng-traces/
> > root@~/lttng-traces # ls
> > root@~/lttng-traces #< no traces are generated>
> >
> > in ps -ef
> >
> > 28664 root       0:00 ./lttng-sessiond -vvv --consumerd64-path=/tmp/lttng-build-root/lib/lttng/libexec/lttng-consumerd
> > 29027 root       0:00 lttng-consumerd --quiet -u --consumerd-cmd-sock /var/run/lttng/ustconsumerd64/command --consumerd-err-sock /var/run/lttng/ustconsumerd64/error
> >
> > Regards,
> > GMK.
> >
> >
> >
> > -----Original Message-----
> > From: Thibault, Daniel [mailto:Daniel.Thibault at drdc-rddc.gc.ca]
> > Sent: Friday, December 06, 2013 9:14 PM
> > To: Manikandan Govindaswamy; Jérémie Galarneau
> > Cc: lttng-dev at lists.lttng.org
> > Subject: RE: [lttng-dev] No trace files are generated for UST
> >
> >> As I'm using the custom image on x86 machine, i've kept the lib in /tmp/lttng-build-root/lib folder and this sample able to see the library as well.
> >>
> >> And the same way I able to create the trace files for kernel but not for ust. There were no dmesg as well.
> >>
> >> [...]
> >> root@/tmp # ldd sample
> >>         linux-vdso.so.1 (0x00007fff2a135000)
> >>         libdl.so.2 => /lib64/libdl.so.2 (0x00007fe2cccb5000)
> >>         liblttng-ust.so.0 => /tmp/lttng-build-root/lib/liblttng-ust.so.0 (0x00007fe2cca51000)
> >>         [...]
> >
> >    Try running sample using:
> >
> > LD_PRELOAD=/tmp/lttng-build-root/lib/liblttng-ust.so.0 ./sample
> >
> >    If the LD_PRELOAD succeeds, we will know at least that liblttng-ust is reachable by sample.
> >
> >    The modules have nothing to do with UST: kernel and user-space tracing are essentially independent features.
> >
> > Daniel U. Thibault
> > Protection des systèmes et contremesures (PSC) | Systems Protection & Countermeasures (SPC)
> > Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS)
> > R & D pour la défense Canada - Valcartier (RDDC Valcartier) | Defence R&D Canada - Valcartier (DRDC Valcartier)
> > 2459 route de la Bravoure
> > Québec QC  G3J 1X5
> > CANADA
> > Vox : (418) 844-4000 x4245
> > Fax : (418) 844-4538
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> > Gouvernement du Canada | Government of Canada <http://www.valcartier.drdc-rddc.gc.ca/>
> 
> 
> 
> -- 
> Jérémie Galarneau
> EfficiOS Inc.
> http://www.efficios.com


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