Hi,
This is a stable release announcement for the LTTng-UST tracer.
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
