mdns attach is broken on latest master #45468
Description
Flutter crash report; please file at https://github.com/flutter/flutter/issues.
command
flutter --no-color attach --machine --device-id=1b6eae756ec0f26f3134b3d0c03f7932a8be1a61 lib/main.dart
exception
NoSuchMethodError: NoSuchMethodError: The getter 'path' was called on null.
Receiver: null
Tried calling: path
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 VMService._connect (package:flutter_tools/src/vmservice.dart:325:80)
#2 VMService.connect (package:flutter_tools/src/vmservice.dart:315:21)
#3 FlutterDevice.connect.<anonymous closure> (package:flutter_tools/src/resident_runner.dart:175:35)
#4 _rootRunUnary (dart:async/zone.dart:1134:38)
#5 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#6 _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
#7 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:338:11)
#8 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:265:7)
#9 _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:377:20)
#10 _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:252:5)
#11 _AsBroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:476:11)
#12 _rootRunUnary (dart:async/zone.dart:1138:13)
#13 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#14 _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
#15 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:338:11)
#16 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:265:7)
#17 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:766:19)
#18 _StreamController._add (dart:async/stream_controller.dart:642:7)
#19 new Stream.fromFuture.<anonymous closure> (dart:async/stream.dart:174:18)
#20 _rootRunUnary (dart:async/zone.dart:1134:38)
#21 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#22 _FutureListener.handleValue (dart:async/future_impl.dart:139:18)
#23 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:680:45)
#24 Future._propagateToListeners (dart:async/future_impl.dart:709:32)
#25 Future._completeWithValue (dart:async/future_impl.dart:524:5)
#26 _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:32:15)
#27 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:290:13)
#28 MDnsObservatoryDiscovery.getObservatoryUri (package:flutter_tools/src/mdns_discovery.dart)
<asynchronous suspension>
#29 AttachCommand._attachToDevice (package:flutter_tools/src/commands/attach.dart:238:47)
<asynchronous suspension>
#30 AttachCommand.runCommand.<anonymous closure> (package:flutter_tools/src/commands/attach.dart:177:19)
#31 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:146:29)
#32 _rootRun (dart:async/zone.dart:1126:13)
#33 _CustomZone.run (dart:async/zone.dart:1023:19)
#34 _runZoned (dart:async/zone.dart:1518:10)
#35 runZoned (dart:async/zone.dart:1465:12)
#36 AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
#37 AttachCommand.runCommand (package:flutter_tools/src/commands/attach.dart:176:19)
<asynchronous suspension>
#38 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:615:18)
#39 _asyncThenWrapperHelper.<anonymous closure> (dart:async-patch/async_patch.dart:73:64)
#40 _rootRunUnary (dart:async/zone.dart:1134:38)
#41 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#42 _FutureListener.handleValue (dart:async/future_impl.dart:139:18)
#43 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:680:45)
#44 Future._propagateToListeners (dart:async/future_impl.dart:709:32)
#45 Future._completeWithValue (dart:async/future_impl.dart:524:5)
#46 Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:554:7)
#47 _rootRun (dart:async/zone.dart:1126:13)
#48 _CustomZone.run (dart:async/zone.dart:1023:19)
#49 _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#50 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23)
#51 _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#52 _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#53 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#54 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:175:5)
flutter doctor
[✓] Flutter (Channel master, v1.12.11-pre.8, on Mac OS X 10.14.5 18F132, locale zh-Hans-CN)
• Flutter version 1.12.11-pre.8 at /Users/apple/Library/flutter
• Framework revision f40dbf8ca0 (10 hours ago), 2019-11-23 01:02:54 -0500
• Engine revision d1cac77d5a
• Dart version 2.7.0
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /Users/apple/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• ANDROID_HOME = /Users/apple/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.0, Build version 11A420a
• CocoaPods version 1.8.4
[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 41.0.2
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[✓] IntelliJ IDEA Ultimate Edition (version 2019.2.1)
• IntelliJ at /Applications/IntelliJ IDEA.app
• Flutter plugin version 40.2.3
• Dart plugin version 192.7359
[✓] Connected device (2 available)
• “apple”的 iPhone • 1b6eae756ec0f26f3134b3d0c03f7932a8be1a61 • ios • iOS 12.4.2
• iPhone 8 • D2483163-94BA-4A1C-9EB8-26964C81824C • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-0 (simulator)
! Doctor found issues in 1 category.