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

Thibault, Daniel Daniel.Thibault at drdc-rddc.gc.ca
Fri Dec 6 10:44:22 EST 2013

> 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)
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