About this patch release

2026-06-05 lttng-tools 2.14.2 (National Fish and Chip Day)

The most important fixes in this release are:

• Fixed a session daemon deadlock triggered by a burst of notifications.
• Fixed session daemon aborts when loading an agent session configuration.
• Fixed live viewers reading from the wrong trace chunk after a per-PID
  session clear.
• Restored CTF 1.8 traces broken by an over-strict identifier check
  introduced in 2.14.
• Plugged a lock-file file-descriptor leak into the consumer daemon across
  fork/exec.
• Corrected several lttng machine-interface (MI) output errors.
• Added the missing 9p and dma-fence probes to the default kernel probe list.

Full changelog: v2.14.1...v2.14.2

About LTTng-tools 2.14

This release is named after "Orbitales", a bold creation from Noctem Artisans Brasseurs in Québec City.

Pitch black and dense—one team member compared the color to used motor oil—this beer offers an intriguing sensory experience. Aged in wood casks, it delivers rich aromas and flavors of blackberry as well as a hint of acidity. There’s no head to speak of, but a whisper of blue cheese funk lingers just enough to keep you curious.

The most notable features of this release are:

• A new per-channel buffer allocation policy for user space channels, letting
  each user or process—rather than each CPU—get its own ring buffer
  (--buffer-allocation).
• A new --buffer-ownership option of the enable-channel command that
  replaces the deprecated --buffers-global, --buffers-uid, and
  --buffers-pid options.
• User space tracing support for the Apache Log4j 2 tracing domain, in
  addition to the existing Apache log4j 1.2 support.
• Experimental support of CTF 2 for both the user space and kernel tracers.
• New --all and --glob options for the start, stop, and destroy
  commands.

For a detailed description of these features, read the full LTTng 2.14
announcement: https://github.com/lttng/lttng-tools/releases/tag/v2.14.0