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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. Those releases contain a few bug fixes, the most important being a fix for missing "per-channel" buffers field header initialization, causing per-channel traces to be sometimes only partially readable. * Detailed change logs: 2026-05-22 lttng-ust 2.15.1 * fix: return negative error code on incorrect message size * fix: check shmp() return value before dereference * frontend: Change likely to unlikely * fix: use decrementing counter in zero_file to avoid underflow warning * fix: initialize LTTNG_UST_LFILE struct in ust_safe_vsnprintf * fix: initialize sigevent struct before timer_create * fix: close_range inefficiency with hash table fd-tracker * fix: excessive memory usage of fd-tracker * fix: check for NULL before dereference in ustctl * Fix: stream instance id mismatch for populated packets in per-channel ringbuffers * doc/examples: add upper bound to minimal CMake version * fix: warning with gcc 15 attribute nonstring 2026-05-22 lttng-ust 2.14.2 * Fix: stream instance id mismatch for populated packets in per-channel ringbuffers * fix: check shmp() return value before dereference * fix: return negative error code on incorrect message size * fix: use decrementing counter in zero_file to avoid underflow warning * fix: initialize LTTNG_UST_LFILE struct in ust_safe_vsnprintf * fix: initialize sigevent struct before timer_create * fix: close_range inefficiency with hash table fd-tracker * fix: excessive memory usage of fd-tracker * doc/examples: add upper bound to minimal CMake version * fix: warning with gcc 15 attribute nonstring 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