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
