LTTng bugs repository

07/09/2026

KS 02:35 PM LTTng-UST Bug #1438 (Resolved): Big memory usage when RLIMIT_NOFILE is high

Hi Romain,
my apologies for forgetting to update this issue. A fix was merged into the master branch a while back to address this issue: https://github.com/lttng/lttng-ust/commit/caba21b471d600542425ecf93391d92f16a3a848
cheers,
ki... Kienan Stewart

KS 02:33 PM LTTng-UST Bug #1443 (Resolved): lttng_ust_build_bug_on(false)  triggers UBSan  vla-bound  in C++ builds

Hi Pavel,
thanks for the detailed report! A fix has been merged into the master branch: https://github.com/lttng/lttng-ust/commit/e65b8914742a2b3aaf8d2fd3c24404b63062b1de
cheers,
kienan Kienan Stewart

06/05/2026

KS 03:28 PM LTTng-tools Bug #1440 (Resolved): Lttng sessiond crashing with Invalid zero length identifier

Hi Srishaka,
lttng-tools 2.14.2 is now available. Let me know if that helps.
thanks,
kienan Kienan Stewart

06/03/2026

KS 11:44 AM LTTng-tools Bug #1440: Lttng sessiond crashing with Invalid zero length identifier

Hi Srishaka,
we're looking at making a bug-fix release this week. I'll let you know when it's available.
thanks,
kienan Kienan Stewart

05/08/2026

KS 10:36 AM LTTng-tools Bug #1440: Lttng sessiond crashing with Invalid zero length identifier

Hi Srishaka,
the fix for zero-length identifiers is planned for the next stable-2.14 bug-fix release. I don't have an estimated timeline for that right now.
My off-hand recollection is that the problem is provoked by traced applica... Kienan Stewart

04/30/2026

KS 02:03 PM Babeltrace Bug #1439: babeltrace Python bindings segfault on Python 3.14 when reading trace

Hi Christophe,
thanks for the bug report. Babeltrace 1.5 is no longer supported. Are you able to use Babeltrace 2.1 or Babeltrace 2.0?
thanks,
kienan Kienan Stewart

04/01/2026

KS 10:41 AM LTTng-UST Bug #1438: Big memory usage when RLIMIT_NOFILE is high

Hi Romain,
thanks for the very clear report! Some folks here are taking a look at this.
thanks,
kienan Kienan Stewart

02/18/2026

KS 10:25 AM LTTng-tools Bug #1436 (Resolved): tests/regression/tools/trace-format/kernel-local-trace-pretty.expect.32 not included in release tarballs

Hi Alexander,
the fix has been merged into the master branch (https://github.com/lttng/lttng-tools/commit/f6f8f5054f74c27b7939ec94bb0c1a873ed6d0c4), and will be backported into the next bugfix release.
thanks,
kienan Kienan Stewart

02/16/2026

KS 01:29 PM LTTng-tools Bug #1436 (In Progress): tests/regression/tools/trace-format/kernel-local-trace-pretty.expect.32 not included in release tarballs

Hi Alexander,
thanks for the bug report!
Here's my proposed patch: https://review.lttng.org/c/lttng-tools/+/16647
thanks,
kienan Kienan Stewart

10/15/2025

KS 02:36 PM LTTng-modules Revision 623b5622 (lttng-modules): Fix: Set CTF version in metadata packet headers for CTF2

Observed issue
==============
When tracing with a session configured to use CTF2, the metadata
packet header still contains CTF major 1 and minor 8.
Solution
========
Use the session's configured output format to decide the values to ... Kienan Stewart