[PR #6039] [client] release Status.mux before invoking notifier callbacks #28949

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saavagebueno · 2026-08-05T08:07:11-04:00

saavagebueno commented

2026-08-05 08:07:11 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/6039

State: closed
Merged: Yes

Describe your changes

The Status recorder used to fire notifier callbacks while holding d.mux:

notifyPeerListChanged / notifyPeerStateChangeListeners ran from inside the locked section of every Update*/AddPeerStateRoute/etc.
notifyAddressChanged ran from UpdateLocalPeerState and CleanLocalPeerState while d.mux was held.
onConnectionChanged was registered with a defer above defer d.mux.Unlock, so it executed before the mutex was released in the Mark*Connected/ Disconnected helpers.
notifyPeerStateChangeListeners did a blocking channel send under d.mux, so a slow subscriber stalled every other d.mux holder.

A listener that re-enters the recorder (e.g. calls GetFullStatus from within a callback) deadlocks against d.mux, and any callback that takes longer than expected stalls every other state query for its duration.

Capture the values needed for notification under the lock, release d.mux, then call the notifier. Build per-peer router-state snapshots inside the lock and dispatch them via dispatchRouterPeers afterwards. The router-peer channel send stays blocking, but now happens outside d.mux so a slow consumer cannot stall any other d.mux holder, and no peer state transitions are silently dropped.

The notifier itself is unchanged: its internal state was already protected by its own locks, and the field d.notifier is set once in NewRecorder and never reassigned, so reading it without d.mux is safe.

Also fix a pre-existing race in Test_notifier_RemoveListener / Test_notifier_SetListener: setListener spawns a goroutine that writes listener.peers, but the tests read listener.peers without waiting for it.

Issue ticket number and link

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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)

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

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Summary by CodeRabbit

Tests
- Enhanced peer notification test synchronization to ensure proper callback execution ordering.
Refactor
- Improved peer state change notification handling for more efficient lock management.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/6039 **State:** closed **Merged:** Yes --- ## Describe your changes The Status recorder used to fire notifier callbacks while holding d.mux: - notifyPeerListChanged / notifyPeerStateChangeListeners ran from inside the locked section of every Update*/AddPeerStateRoute/etc. - notifyAddressChanged ran from UpdateLocalPeerState and CleanLocalPeerState while d.mux was held. - onConnectionChanged was registered with a defer above defer d.mux.Unlock, so it executed before the mutex was released in the Mark*Connected/ Disconnected helpers. - notifyPeerStateChangeListeners did a blocking channel send under d.mux, so a slow subscriber stalled every other d.mux holder. A listener that re-enters the recorder (e.g. calls GetFullStatus from within a callback) deadlocks against d.mux, and any callback that takes longer than expected stalls every other state query for its duration. Capture the values needed for notification under the lock, release d.mux, then call the notifier. Build per-peer router-state snapshots inside the lock and dispatch them via dispatchRouterPeers afterwards. The router-peer channel send stays blocking, but now happens outside d.mux so a slow consumer cannot stall any other d.mux holder, and no peer state transitions are silently dropped. The notifier itself is unchanged: its internal state was already protected by its own locks, and the field d.notifier is set once in NewRecorder and never reassigned, so reading it without d.mux is safe. Also fix a pre-existing race in Test_notifier_RemoveListener / Test_notifier_SetListener: setListener spawns a goroutine that writes listener.peers, but the tests read listener.peers without waiting for it. ## 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 * **Tests** * Enhanced peer notification test synchronization to ensure proper callback execution ordering. * **Refactor** * Improved peer state change notification handling for more efficient lock management.

saavagebueno added the pull-request label 2026-08-05 08:07:11 -04:00

saavagebueno closed this issue

2026-08-05 08:07:11 -04:00

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Reference: DYNR/netbird#28949