[RELEASE] LTTng-modules 2.13.21 and 2.14.2 (Linux kernel tracer)

[Mathieu Desnoyers]

Hi,

Those LTTng-modules stable releases mainly fix an missing preemption off
issue with system call instrumentation when using LTTng-modules against
a Linux kernel v6.13 or more recent, with preemptible kernels (PREEMPT
or PREEMPT_LAZY configurations). Users of LTTng-modules with those
configurations should upgrade.

This issue is the result of an upstream kernel change (introduction of
faultable syscall tracepoints), without the introduction of the
corresponding changes in LTTng-modules.

One effect of this bug is corruption of per-cpu linked-lists under
load. It also possible that the ring buffer corrupts itself because
of unexpected producer migration.

The other change in those releases is the introduction of a wrapper for
`get_pfnblock_migatetype` to build against v6.17 kernels.

* New in this release:

2025-10-06 LTTng modules 2.14.2
         * Fix: Add wrapper for `get_pfnblock_migatetype`
         * Fix: Protect syscall probes with preemption disable

2025-10-06 LTTng modules 2.13.21
         * Fix: Add wrapper for `get_pfnblock_migatetype`
         * Fix: Protect syscall probes with preemption disable

Thanks,

Mathieu

Project website: https://lttng.org
Documentation: https://lttng.org/docs
Download link: https://lttng.org/download


-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com