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Fix CheckedContinuation double-resume in waitForConnectionReady

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The 'resumed' guard flag was set inside a dispatched MainActor Task rather than
synchronously in the connection state handler. Two states arriving in quick
succession (e.g. .ready then .failed) could both pass the guard before either
Task ran, resuming the continuation twice and trapping. Claim the continuation
synchronously on the serial queue before dispatching the side effects.

Fixes a SIGTRAP seen in TestFlight build 261.
This commit is contained in:
Arkadiusz Fal
2026-05-12 22:32:13 +02:00
parent ec5ac944c4
commit 2ed0dc72be
1 changed files with 15 additions and 8 deletions
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23
Yattee/Services/RemoteControl/LocalNetworkService.swift
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@@ -1211,7 +1211,19 @@ final class LocalNetworkService {
let state = ResumedState()
connection.stateUpdateHandler = { [weak self] connectionState in
// Claim the continuation synchronously here. `stateUpdateHandler`
// runs on the serial `queue`, so this test-and-set is atomic.
// Previously `state.resumed = true` was set inside the dispatched
// MainActor Task, so two states arriving in quick succession (e.g.
// .ready then .failed) could both pass the guard before either Task
// ran, resuming the continuation twice and trapping.
let isTerminal: Bool
switch connectionState {
case .ready, .failed, .cancelled: isTerminal = true
default: isTerminal = false
}
guard !state.resumed else { return }
if isTerminal { state.resumed = true }
Task { @MainActor [weak self] in
let elapsed = Int(Date().timeIntervalSince(startTime) * 1000)
@@ -1227,25 +1239,20 @@ final class LocalNetworkService {
self?.rcLog("CONNECT", "[\(device.name)] State: waiting - \(error.localizedDescription) (\(elapsed)ms)", isWarning: true)
case .ready:
state.resumed = true
self?.connectedPeers.insert(device.id)
self?.recentlySeenDevices[device.id] = Date()
self?.rcLog("CONNECT", "[\(device.name)] State: READY (\(elapsed)ms)", details: "connectedPeers=\(self?.connectedPeers.count ?? 0)")
continuation.resume()
case .failed(let error):
state.resumed = true
self?.connections.removeValue(forKey: device.id)
self?.rcLog("CONNECT", "[\(device.name)] State: FAILED - \(error.localizedDescription) (\(elapsed)ms)", isError: true)
continuation.resume(throwing: error)
case .cancelled:
if !state.resumed {
state.resumed = true
self?.connections.removeValue(forKey: device.id)
self?.rcLog("CONNECT", "[\(device.name)] State: cancelled (\(elapsed)ms)", isWarning: true)
continuation.resume(throwing: CancellationError())
}
self?.connections.removeValue(forKey: device.id)
self?.rcLog("CONNECT", "[\(device.name)] State: cancelled (\(elapsed)ms)", isWarning: true)
continuation.resume(throwing: CancellationError())
@unknown default:
self?.rcDebug("CONNECT", "[\(device.name)] State: unknown (\(elapsed)ms)")