[PR #6871] [MERGED] [client] Fix flaky Test_ConnectPeers busy-loop handshake wait #29982

New Issue

saavagebueno · 2026-08-05T08:09:36-04:00

saavagebueno commented

2026-08-05 08:09:36 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/6871
Author: @riccardomanfrin
Created: 7/23/2026
Status: ✅ Merged
Merged: 7/23/2026
Merged by: @riccardomanfrin

Base: main ← Head: fix/connect-peers-flaky-test

📝 Commits (1)

b0b9aae [client] Fix flaky Test_ConnectPeers busy-loop handshake wait

📊 Changes

1 file changed (+13 additions, -7 deletions)

View changed files

📝 client/iface/iface_test.go (+13 -7)

📄 Description

Describe your changes

Test_ConnectPeers in client/iface is flaky in CI, timing out with
waiting for peer handshake timeout after 30s.

The wait loop polled getPeer() in a tight busy-loop with no sleep
(a select with a default branch), pegging a CPU core. The peers run
userspace WireGuard (stdnet transport), so the spin starved the
wireguard-go goroutines that actually process the handshake, making the
30s wait flaky under CI load.

Poll on a 500ms ticker instead so the CPU is yielded between checks, and
check the handshake state before waiting. Same logic, no busy-spin.

Issue ticket number and link

N/A — CI flakiness fix.

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)
This change does not modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature

Documentation

Documentation is not needed for this change (test-only fix)

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}

Summary by CodeRabbit

Tests
- Improved peer connection test waiting behavior to avoid busy spinning.
- Added a timeout and periodic checks, with clearer failure handling when a handshake does not complete.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/6871 **Author:** [@riccardomanfrin](https://github.com/riccardomanfrin) **Created:** 7/23/2026 **Status:** ✅ Merged **Merged:** 7/23/2026 **Merged by:** [@riccardomanfrin](https://github.com/riccardomanfrin) **Base:** `main` ← **Head:** `fix/connect-peers-flaky-test` --- ### 📝 Commits (1) - [`b0b9aae`](https://github.com/netbirdio/netbird/commit/b0b9aaedc0cbb54af88ecf27716e999de253de89) [client] Fix flaky Test_ConnectPeers busy-loop handshake wait ### 📊 Changes **1 file changed** (+13 additions, -7 deletions) <details> <summary>View changed files</summary> 📝 `client/iface/iface_test.go` (+13 -7) </details> ### 📄 Description ## Describe your changes `Test_ConnectPeers` in `client/iface` is flaky in CI, timing out with `waiting for peer handshake timeout after 30s`. The wait loop polled `getPeer()` in a tight busy-loop with no sleep (a `select` with a `default` branch), pegging a CPU core. The peers run userspace WireGuard (stdnet transport), so the spin starved the wireguard-go goroutines that actually process the handshake, making the 30s wait flaky under CI load. Poll on a 500ms ticker instead so the CPU is yielded between checks, and check the handshake state before waiting. Same logic, no busy-spin. ## Issue ticket number and link N/A — CI flakiness fix. ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) - [x] This change does **not** modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature ## Documentation - [x] Documentation is **not needed** for this change (test-only fix)  --- <a href="https://app.blacksmith.sh/netbirdio/codesmith/netbird/pr/6871"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-light-v2.svg"><img alt="View with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"></picture></a> <a href="https://backend.blacksmith.sh/track/enable-autofix?expires=1787405146&installation_model_id=427504&pr_number=6871&repository=netbirdio%2Fnetbird&return_to=https%3A%2F%2Fgithub.com%2Fnetbirdio%2Fnetbird%2Fpull%2F6871&signature=a68daf1747583280b5d1d083c6b45ade4c0d441a38fd25ab9a2ca01f87511ad9"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-light.svg"><img alt="Autofix with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"></picture></a> <sup>Need help on this PR? Tag <code>@codesmith-bot</code> with what you need. Autofix is disabled.</sup>    ## Summary by CodeRabbit * **Tests** * Improved peer connection test waiting behavior to avoid busy spinning. * Added a timeout and periodic checks, with clearer failure handling when a handshake does not complete.  --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 08:09:36 -04:00

saavagebueno closed this issue

2026-08-05 08:09:36 -04:00

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Reference: DYNR/netbird#29982