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Troubleshooting LTTng Tracing: CTF Logs Not Being Created on ARM-Cortex A9 with OpenWRT

I am facing an issue with LTTng tools where tracing starts in userspace but fails to log traces (CTF logs). Despite all necessary files, including lttng-ust, being ported, no lttng-traces directory is created in the home directory after a successful session. The setup involves an ARM Cortex A9 SoC running OpenWRT with RT Patch 75. Although events are created successfully, the expected logs are missing. Please refer to the attached slides for more details on the available lttng-related files.

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Troubleshooting LTTng Tracing: CTF Logs Not Being Created on ARM-Cortex A9 with OpenWRT

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Presentation Transcript

  1. Issue that I am facing! • LTTng Tools does successfully start tracing all or specific events in userspace, but doesn’t log the traces (CTF logs) (please refer snaps at next slides). • All the files including lttng-ust is ported. • Last two slides list out all the lttngrelated files that are available/ported in the system. • SoC has – ARM-Cortex A9 and openWRT Linux with RT Patch 75.

  2. LTTng-Session Successful • LTTng Session created successfully (however I don’t see lttng-traces directory being created in home).

  3. LTTng- Event creation Successful in userspace

  4. LTTng- Tracing Start/Stop in userspaceBut not CTF logged • Tracing started successfully in user spacefor the specified event but not logged in Home directory (as /root shows no file/directory under it).

  5. LTTng – All the needed files seeming are available.

  6. LTTng – Some header files.

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