[lttng-dev] Lttng start failed

Mathieu Desnoyers mathieu.desnoyers at efficios.com
Fri Jun 8 13:42:26 EDT 2012

* Pavan Anumula (pavan.anumula at sasken.com) wrote:
> Hi ,
> I am new to LTTng usage, I am trying to use LTTng 2.0.1 and LTTng-modules-2.0.2  for ARM(omapL138), with Linux kernel 2.6.33 wit RT-29 patch on it.
> After enabling all the kernel events I am facing the below errors. I loaded all the modules manually by insmod.
> root at arago:~/lttng-traces# arm-none-linux-gnueabi-lttng create newsessiom
> Session newsessiom created.
> Traces will be written in /home/root/lttng-traces/newsessiom-20110325-154922
> root at arago:~/lttng-traces# arm-none-linux-gnueabi-lttng enable-event -a --kernel
> All kernel events are enabled in channel channel0
> root at arago:~/lttng-traces# arm-none-linux-gnueabi-lttng start
> LTTng: Failure to write metadata to buffers (timeout)
> Error: Starting kernel trace failed
> Please kindly help me on this.

I think you should look into the lttng-sessiond --help :

      --consumerd32-path PATH     Specify path for the 32-bit UST consumer daemon binary
      --consumerd32-libdir PATH   Specify path for the 32-bit UST consumer daemon libraries
      --consumerd64-path PATH     Specify path for the 64-bit UST consumer daemon binary
      --consumerd64-libdir PATH   Specify path for the 64-bit UST consumer daemon libraries

options. My guess is that lttng-sessiond is not able to find the
consumerd binary files, maybe due to a rename or because they have been
moved after install.

One more thing that might help is to launch the lttng-sessiond with
"-vvv" : it will provide verbose output and let us know where things
fall apart.



> Thanks in advance,
> Pavan
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Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.

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