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The library "liblttng-ust" enables tracing of applications and libraries. The most relevant bug fix can be found in the 2.15.2 release. It adds bounded retry loops for per-channel buffers, thus fixing a regression affecting the supported event throughput. This regression was introduced by the robust ring buffers in LTTng-UST 2.15 and affected specifically the per-channel buffers. Note that version 2.14.3 of LTTng-UST is the last version of that stable branch. With this release, the 2.14 branch of LTTng-UST has now reached its cycle "End of Life". Please upgrade to 2.15.x or 2.16.x if you wish to benefit from new features and future bug fixes. * New in these releases: 2026-09-08 lttng-ust 2.15.2 * tests: Disable coredumps for expected ABI failures * Fix: lttng_ust_build_bug_on undefined behavior in C++ builds * Fix: ringbuffer: retry on wrap-around contention for per-channel buffers * Fix: Introduce concurrent subbuffer-ownership retry loop * lttng-ust(3): document lttng_ust_field_unused() * lttng-ust(3): document LTTNG_UST_TRACEPOINT_MODEL_EMF_URI() 2026-09-08 lttng-ust 2.14.3 * tests: Disable coredumps for expected ABI failures * Fix: lttng_ust_build_bug_on undefined behavior in C++ builds * lttng-ust(3): document lttng_ust_field_unused() * lttng-ust(3): document LTTNG_UST_TRACEPOINT_MODEL_EMF_URI() Project website: https://lttng.org Documentation: https://lttng.org/docs Download link: https://lttng.org/download Enjoy! Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com