[PR #6147] [CLOSED] [client] protect Manager.server access under m.lock #27634

New Issue

saavagebueno · 2026-08-05T07:08:59-04:00

saavagebueno commented

2026-08-05 07:08:59 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/6147
Author: @riccardomanfrin
Created: 5/15/2026
Status: ❌ Closed

Base: main ← Head: fix/rosenpass_server_lock

📝 Commits (1)

2624b2c Apply code rabbit suggestions

📊 Changes

1 file changed (+15 additions, -8 deletions)

View changed files

📝 client/internal/rosenpass/manager.go (+15 -8)

📄 Description

Describe your changes

Protect Manager.server in client/internal/rosenpass/manager.go with the
existing m.lock. Reads and writes of m.server on the Run and Close
paths previously ran without the lock, while peer worker callbacks
(OnConnected → addPeer, OnDisconnected → removePeer) accessed the
same field under m.lock. This left a data race between peer worker
goroutines and engine shutdown:

addPeer nil-checks m.server and then calls m.server.AddPeer(...).
Without locking on the Close side, another goroutine running Close()
could zero m.server between the check and the call, turning the
defensive nil-guard into a nil-pointer panic.
Run() publishing m.server and a concurrent Close() zeroing it
also raced.

Run() now takes m.lock only to publish the new *rp.Server, then
invokes the lib's server.Run() on a local variable so the lock is not
held during it. Close() detaches m.server under the lock and calls
server.Close() on the local variable, so a slow shutdown does not block
other Manager methods waiting on m.lock.

Verified with go test -race ./client/internal/rosenpass/....

Issue ticket number and link

Surfaced during CodeRabbit review of PR
https://github.com/netbirdio/netbird/pull/6136. The race is pre-existing
(present since the original Rosenpass integration in commit 5de4acf2f,
PR #1153) but worth fixing alongside the other Rosenpass concurrency work
(#4341 nil-guard). No separate public issue.

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)

Internal concurrency fix. The public NetBird CLI / API surface,
configuration options, and Rosenpass feature behavior are unchanged: the
lock prevents a nil-pointer panic under a shutdown-vs-peer-callback race
without altering any observable flow.

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

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

N/A

Summary by CodeRabbit

Bug Fixes
- Enhanced server lifecycle management for improved reliability and thread safety during startup and shutdown sequences.
- Improved error logging during server cleanup operations.

_{🔄 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/6147 **Author:** [@riccardomanfrin](https://github.com/riccardomanfrin) **Created:** 5/15/2026 **Status:** ❌ Closed **Base:** `main` ← **Head:** `fix/rosenpass_server_lock` --- ### 📝 Commits (1) - [`2624b2c`](https://github.com/netbirdio/netbird/commit/2624b2cccfc532188897d172f32b42975575cd3c) Apply code rabbit suggestions ### 📊 Changes **1 file changed** (+15 additions, -8 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/rosenpass/manager.go` (+15 -8) </details> ### 📄 Description ## Describe your changes Protect `Manager.server` in `client/internal/rosenpass/manager.go` with the existing `m.lock`. Reads and writes of `m.server` on the `Run` and `Close` paths previously ran without the lock, while peer worker callbacks (`OnConnected` → `addPeer`, `OnDisconnected` → `removePeer`) accessed the same field under `m.lock`. This left a data race between peer worker goroutines and engine shutdown: - `addPeer` nil-checks `m.server` and then calls `m.server.AddPeer(...)`. Without locking on the `Close` side, another goroutine running `Close()` could zero `m.server` between the check and the call, turning the defensive nil-guard into a nil-pointer panic. - `Run()` publishing `m.server` and a concurrent `Close()` zeroing it also raced. `Run()` now takes `m.lock` only to publish the new `*rp.Server`, then invokes the lib's `server.Run()` on a local variable so the lock is not held during it. `Close()` detaches `m.server` under the lock and calls `server.Close()` on the local variable, so a slow shutdown does not block other Manager methods waiting on `m.lock`. Verified with `go test -race ./client/internal/rosenpass/...`. ## Issue ticket number and link Surfaced during CodeRabbit review of PR https://github.com/netbirdio/netbird/pull/6136. The race is pre-existing (present since the original Rosenpass integration in commit `5de4acf2f`, PR #1153) but worth fixing alongside the other Rosenpass concurrency work (#4341 nil-guard). No separate public issue. ## 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) Internal concurrency fix. The public NetBird CLI / API surface, configuration options, and Rosenpass feature behavior are unchanged: the lock prevents a nil-pointer panic under a shutdown-vs-peer-callback race without altering any observable flow. ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: N/A  ## Summary by CodeRabbit * **Bug Fixes** * Enhanced server lifecycle management for improved reliability and thread safety during startup and shutdown sequences. * Improved error logging during server cleanup operations.  [![Review Change Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/netbirdio/netbird/pull/6147)   --- <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 07:08:59 -04:00

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Reference: DYNR/netbird#27634