[PR #4974] [ios] iOS client start hanging on reconnection #21724

New Issue

saavagebueno · 2026-08-05T05:08:52-04:00

saavagebueno commented

2026-08-05 05:08:52 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/4974
Author: @doromaraujo
Created: 12/19/2025
Status: 🔄 Open

Base: main ← Head: bug/ios-hanging-reconection

📝 Commits (6)

72e1fe7 Add extra logs to engine and dns manager
0e9cddf Execute PopulateNetbirdConfig in a go routine
5a91664 Improve PopulateNetbirdConfig goroutine with retry logic
ee9166d Remove outdated success log message
76c63d0 Track PopulateNetbirdConfig goroutine with e.shutdownWg
691a905 Change log.Debug in goroutine for log.Info

📊 Changes

2 files changed (+77 additions, -3 deletions)

View changed files

📝 client/internal/dns/mgmt/mgmt.go (+5 -0)
📝 client/internal/engine.go (+72 -3)

📄 Description

Describe your changes

This PR adds executes the PopulateNetbirdConfig() call in engine's Start() in a go routine with retrying mechanism.

It also adds breadcrumb logs along Start()'s function calls.

Reasoning for it is that Go’s DNS lookups on macOS/iOS can hang when a network change interferes with the system resolver’s operation.

Issue ticket number and link

Stack

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)

By submitting this pull request, you confirm that you have read and agree to the terms of the Contributor License Agreement.

Documentation

Select exactly one:

I added/updated documentation for this change
Documentation is not needed for this change (explain why)

Docs PR URL (required if "docs added" is checked)

Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/__

Summary by CodeRabbit

Bug Fixes
- Improved DNS cache population reliability with automatic retries (exponential backoff and jitter) and cancellation support to reduce startup failures.
Chores
- Enhanced observability with expanded runtime logging across startup and configuration flows for better traceability and debugging.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

_{🔄 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/4974 **Author:** [@doromaraujo](https://github.com/doromaraujo) **Created:** 12/19/2025 **Status:** 🔄 Open **Base:** `main` ← **Head:** `bug/ios-hanging-reconection` --- ### 📝 Commits (6) - [`72e1fe7`](https://github.com/netbirdio/netbird/commit/72e1fe7b483442428fd4baaa3aaf624db5f397e8) Add extra logs to engine and dns manager - [`0e9cddf`](https://github.com/netbirdio/netbird/commit/0e9cddf2e878edbe1bd1f68e2ff0673ae4d008ed) Execute PopulateNetbirdConfig in a go routine - [`5a91664`](https://github.com/netbirdio/netbird/commit/5a916641160d77e053de806d64330777d5f5f714) Improve PopulateNetbirdConfig goroutine with retry logic - [`ee9166d`](https://github.com/netbirdio/netbird/commit/ee9166d771f5e86c634e3ad8b22e6e4bcd1e8709) Remove outdated success log message - [`76c63d0`](https://github.com/netbirdio/netbird/commit/76c63d0dd26a777f6b3be5e684a15c7a05b84f6d) Track PopulateNetbirdConfig goroutine with e.shutdownWg - [`691a905`](https://github.com/netbirdio/netbird/commit/691a90516df4dc029a00a61f0d60dbefda708c40) Change log.Debug in goroutine for log.Info ### 📊 Changes **2 files changed** (+77 additions, -3 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/dns/mgmt/mgmt.go` (+5 -0) 📝 `client/internal/engine.go` (+72 -3) </details> ### 📄 Description ## Describe your changes This PR adds executes the PopulateNetbirdConfig() call in engine's Start() in a go routine with retrying mechanism. It also adds breadcrumb logs along Start()'s function calls. Reasoning for it is that Go’s DNS lookups on macOS/iOS can hang when a network change interferes with the system resolver’s operation. ## Issue ticket number and link ## Stack  ### 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) > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [X] Documentation is **not needed** for this change (explain why) ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__  ## Summary by CodeRabbit * **Bug Fixes** * Improved DNS cache population reliability with automatic retries (exponential backoff and jitter) and cancellation support to reduce startup failures. * **Chores** * Enhanced observability with expanded runtime logging across startup and configuration flows for better traceability and debugging. <sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>  --- <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 05:08:52 -04:00

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Reference: DYNR/netbird#21724