[RELEASE] LTTng-UST 2.14.3 (EOL) and 2.15.2 (Linux user-space tracer)

[RELEASE] LTTng-UST 2.14.3 (EOL) and 2.15.2 (Linux user-space tracer)

[Mathieu Desnoyers via lttng-dev]

LTTng-UST, the Linux Trace Toolkit Next Generation Userspace Tracer,
is a low-overhead application tracer. 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