linux-kernel - [RELEASE] LTTng-UST 2.12.10 and 2.13.8 (Linux user-space tracer)

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Message-ID: <8987e081-13bb-4af2-80d7-5819ad5d4784@efficios.com>
Date: Fri, 19 Apr 2024 14:25:24 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: lttng-dev@...ts.lttng.org, diamon-discuss@...ts.linuxfoundation.org,
 linux-trace-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RELEASE] LTTng-UST 2.12.10 and 2.13.8 (Linux user-space 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.

New in both 2.12.10 and 2.13.8:

* Add close_range wrapper to liblttng-ust-fd.so

GNU libc 2.34 implements a new close_range symbol which is used
by the ssh client and other applications to close all file descriptors,
including those which do not belong to the application. Override
this symbol to prevent the application from closing file descriptors
actively used by lttng-ust.

* Fix: libc wrapper: use initial-exec for malloc_nesting TLS

Use the initial-exec TLS model for the malloc_nesting nesting guard
variable to ensure that the GNU libc implementation of the TLS access
don't trigger infinite recursion by calling the memory allocator wrapper
functions, which can happen with global-dynamic.

This fixes a liblttng-ust-libc-wrapper.so regression on recent
Fedora distributions.

* lttng-ust(3): Fix wrong len_type for sequence

`len_type' of a sequence field must be of type unsigned integer. Some
provided examples in the man page were incorrectly using a type signed
integer, resulting in correct compilation, but error while decoding.

New in 2.13.8:

* ust-tracepoint-event: Add static check of sequences length type

Add a compile-time check to validate that unsigned types are used
for the length field of sequences.

Detailed change logs:

2024-04-19 (National Garlic Day) lttng-ust 2.13.8
         * Add close_range wrapper to liblttng-ust-fd.so
         * ust-tracepoint-event: Add static check of sequences length type
         * lttng-ust(3): Fix wrong len_type for sequence
         * Fix: libc wrapper: use initial-exec for malloc_nesting TLS

2024-04-19 (National Garlic Day) lttng-ust 2.12.10
         * Add close_range wrapper to liblttng-ust-fd.so
         * lttng-ust(3): Fix wrong len_type for sequence
         * Fix: libc wrapper: use initial-exec for malloc_nesting TL

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

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