Exception capturing CPU profile of Dart analysis server

DanTup commented 1 day ago

I hit this error while trying to do some CPU profiling of the analysis server. I don't know if I'll be able to repro, but I thought I should record it here before I lose it.

The steps I followed:

Open my flutter_counter test app in VS Code
Run the Preferences: Open Workspace Settings (JSON) command from the command palette Add "dart.analyzerVmServicePort": 8855 (port number is not important but you'll need it further down) and Save A toast notification should appear in the bottom right warning you that the analysis servers VM Service is enabled
Wait for all initial analysis to complete (No "Analyzing..." or spinners on status bar)
Open a file and find a location to type in
Run the Dart: Open DevTools in Browser command from the palette
In DevTools, enter http://localhost:8855/ (using the port number from above) and click Connect
Navigate to the CPU Profiler tab
Click "Enable Profiler"
Click "Start recording"
Switch back to VS Code and type in the editor to reproduce the poor performance
Click "Stop recording"
At this point, it just got stuck on "Fetching CPU samples" forever

Chrome dev tools console has this:

js_util_patch.dart:81 getDartDevelopmentServiceVersion: (-32601) Method not found
cAU @ js_util_patch.dart:81Understand this warningAI
:9100/api/serveAvailableExtensions?packageRootUri=org-dartlang-sdk%3A%2F%2F%2Fsdk%2Flib%2F_internal%2Fvm:1 

       Failed to load resource: the server responded with a status of 500 (Internal Server Error)Understand this errorAI
js_util_patch.dart:81 HttpRequest api/serveAvailableExtensions failed status = 500, responseText = {"error":"Invalid argument (must be a file:// URI String): \"org-dartlang-sdk:///sdk/lib/_internal/vm\"","logs":["ExtensionsManager.serveAvailableExtensions for rootPathFileUri: org-dartlang-sdk:///sdk/lib/_internal/vm","ExtensionsManager.serveAvailableExtensions adding extensions for app root."]}
cAU @ js_util_patch.dart:81Understand this warningAI
js_util_patch.dart:81 Could not time async operation "cpuProfileProcessingTime" because an exception was thrown:
TypeError: Instance of 'minified:yY': type 'minified:yY' is not a subtype of type 'minified:fC?'

    at Object.p (http://127.0.0.1:9100/main.dart.js:3623:19)
    at Object.c52 (http://127.0.0.1:9100/main.dart.js:4445:18)
    at p2.cvF [as a] (http://127.0.0.1:9100/main.dart.js:4444:3)
    at am5.cgh (http://127.0.0.1:9100/main.dart.js:47598:10)
    at Object.ah (http://127.0.0.1:9100/main.dart.js:47455:15)
    at aM8.$1 (http://127.0.0.1:9100/main.dart.js:91925:14)
    at F.d9 (http://127.0.0.1:9100/main.dart.js:59451:23)
    at aT.u (http://127.0.0.1:9100/main.dart.js:59431:16)
    at Object.c_M (http://127.0.0.1:9100/main.dart.js:6377:17)
    at Object.H (http://127.0.0.1:9100/main.dart.js:6370:15)
cAU @ js_util_patch.dart:81Understand this warningAI
core_patch.dart:279 Uncaught Error: TypeError: Instance of 'minified:yY': type 'minified:yY' is not a subtype of type 'minified:fC?'
    at Object.p (js_helper.dart:1209:19)
    at Object.c52 (rti.dart:1405:3)
    at p2.cvF [as a] (rti.dart:1395:3)
    at am5.cgh (vm_service.dart:3219:5)
    at Object.ah (vm_service.dart:69:14)
    at aM8.$1 (vm_service_private_extensions.dart:899:12)
    at F.d9 (iterable.dart:435:29)
    at aT.u (iterable.dart:364:5)
    at Object.c_M (core_patch.dart:367:5)
    at Object.H (core_patch.dart:348:39)Understand this errorAI
js_util_patch.dart:81 [zoneGuarded]: TypeError: Instance of 'minified:yY': type 'minified:yY' is not a subtype of type 'minified:fC?'
org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/js_helper.dart 1209:19                  wrapException
org-dartlang-sdk:///dart-sdk/lib/_internal/js_shared/lib/rti.dart 1405:3                          _failedAsCheck
org-dartlang-sdk:///dart-sdk/lib/_internal/js_shared/lib/rti.dart 1395:3                          _generalNullableAsCheckImplementation
../../../../../../rc/tmp65uzhjoh/hosted/pub.dev/vm_service-14.3.0/lib/src/vm_service.dart 3219:5  CodeRef._fromJson
../../../../../../rc/tmp65uzhjoh/hosted/pub.dev/vm_service-14.3.0/lib/src/vm_service.dart 69:14   createServiceObject
../../../lib/src/screens/vm_developer/vm_service_private_extensions.dart 899:12                   ProfileCode._fromJson
org-dartlang-sdk:///dart-sdk/lib/internal/iterable.dart 435:29                                    MappedListIterable.elementAt
org-dartlang-sdk:///dart-sdk/lib/internal/iterable.dart 364:5                                     ListIterator.moveNext
org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/core_patch.dart 367:5                   List._of
org-dartlang-sdk:///dart-sdk/lib/_internal/js_runtime/lib/core_patch.dart 348:39                  List.of

Flutter SDK: 3.27.0-0.1.pre Dart version: 3.6.0-334.3.beta

DanTup commented 1 day ago

I tried again and reproduced the same issue. Switching to Flutter stable the issue went away, so this could be a regression (FYI @kenzieschmoll).

kenzieschmoll commented 1 day ago

Are you able to get a stack trace that is not minified? What version of DevTools is this using?

flutter / devtools

Exception capturing CPU profile of Dart analysis server #8567