stalld version v1.25.1 released

Hi all,

I'm pleased to announce the release of stalld v1.25.1, now available at kernel.org, GitLab, and GitHub.

Overview

This release contains critical bug fixes for BPF compilation on older kernels and comprehensive test suite improvements.

On the subject of the test suite, you'll notice that I made pretty heavy use of Anthropic's Claude Sonnet 4.5 to generate the scripts. I would really appreciate some other folks Looking at the test runner (tests/run_tests.sh), the helper functions (tests/helpers/test_helpers.sh) and the individual test scripts. To be clear, I didn't just tell Claude to generate them and then check them in and say "Good to go!"; I spent around three weeks getting things going. That said, I'd love to get into a good argument^wdiscussion on the way the tests work and whether they're worth running.

Key Fixes

BPF CO-RE Compatibility (Wander Lairson Costa)
- Fixed build failures on RHEL 8.x and older kernels (4.18) where thread_info struct lacks the cpu field
- Introduced BPF CO-RE compatibility checks allowing single binary to work across kernel versions
- Made BPF compilation verbose for easier debugging (Derek Barbosa)

Test Infrastructure

This release includes extensive test infrastructure (97 commits):
- 21 comprehensive tests covering all stalld functionality
- Matrix testing across backends (sched_debug, queue_track) and threading modes
- Automated test discovery and helper library
- Configurable starvation generator for controlled testing

Test Validation

Full test suite executed on x86_64 and aarch64 architectures :
- x86_64 (Fedora 42, VM): sched_debug backend 100% pass rate (19/19 tests)
- aarch64 (RHEL 10, bare metal): sched_debug backend 100% pass rate (19/19 tests)

Minor test timing issues observed with queue_track backend in VM
environments (2-4% failure rate) attributed to virtualization and/or architectural timing artifacts. Core functionality verified across both platforms.

Download

- https://git.kernel.org/pub/scm/utils/stalld/stalld.git
- https://gitlab.com/rt-linux-tools/stalld
- https://github.com/clrkwllms/stalld

git tag: v1.25.1

Contributors

- Wander Lairson Costa
- Clark Williams
- Derek Barbosa

Full release notes: doc/RELEASE_NOTES_v1.25.1.md

Best regards,
Clark Williams

The United States Coast Guard
Ruining Natural Selection since 1790