Leak Tracking is flaky #126259
Description
I've seen the failure given below in a couple of places locally and on CI. It doesn't reproduce on re-runs, though. It appears to be a flake, which we need to fix.
03:58 +5097 ~2: /b/s/w/ir/x/w/flutter/packages/flutter/test/material/about_test.dart: ListView of license entries is primary (variant: TargetPlatform.linux)
══╡ EXCEPTION CAUGHT BY FOUNDATION LIBRARY ╞════════════════════════════════════════════════════════
The following ArgumentError was thrown MemoryAllocations while dispatching notifications for
SingleChildRenderObjectElement:
Invalid argument (object): Cannot be a string, number, boolean, record, null, Pointer, Struct or
Union: 704053939
When the exception was thrown, this was the stack:
#0 checkValidWeakTarget (dart:_internal-patch/internal_patch.dart:220:5)
#1 Expando.[] (dart:core-patch/expando_patch.dart:31:5)
#2 FinalizerBase.detach (dart:_internal-patch/internal_patch.dart:335:32)
#3 ObjectTracker._checkForDuplicate (package:leak_tracker/src/leak_tracking/_object_tracker.dart:219:16)
#4 ObjectTracker.startTracking (package:leak_tracker/src/leak_tracking/_object_tracker.dart:51:9)
#5 dispatchObjectEvent (package:leak_tracker/src/leak_tracking/_dispatcher.dart:40:19)
#6 dispatchObjectEvent.<anonymous closure> (package:leak_tracker/src/leak_tracking/leak_tracker.dart:91:16)
#7 dispatchObjectEvent (package:leak_tracker/src/leak_tracking/leak_tracker.dart:94:4)
#8 _withFlutterLeakTracking.flutterEventToLeakTracker (file:///b/s/w/ir/x/w/flutter/packages/flutter/test/foundation/leak_tracking.dart:109:12)
#9 MemoryAllocations.dispatchObjectEvent (package:flutter/src/foundation/memory_allocations.dart:238:23)
#10 MemoryAllocations.dispatchObjectCreated (package:flutter/src/foundation/memory_allocations.dart:272:5)
#11 new Element (package:flutter/src/widgets/framework.dart:3267:34)
#12 new RenderObjectElement (package:flutter/src/widgets/framework.dart)
#13 new SingleChildRenderObjectElement (package:flutter/src/widgets/framework.dart)
#14 SingleChildRenderObjectWidget.createElement (package:flutter/src/widgets/framework.dart:1837:53)
... Normal element mounting (81 frames)
#95 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3971:16)
#96 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6570:36)
#97 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6582:32)
... Normal element mounting (349 frames)
#446 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3971:16)
#447 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6570:36)
#448 Element.updateChild (package:flutter/src/widgets/framework.dart:3708:18)
#449 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:6153:32)
#450 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6595:17)
#451 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#452 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#453 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5251:11)
#454 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#455 StatefulElement.update (package:flutter/src/widgets/framework.dart:5274:5)
#456 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#457 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#458 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#459 ProxyElement.update (package:flutter/src/widgets/framework.dart:5417:5)
#460 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#461 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#462 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#463 ProxyElement.update (package:flutter/src/widgets/framework.dart:5417:5)
#464 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#465 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#466 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#467 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5251:11)
#468 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#469 StatefulElement.update (package:flutter/src/widgets/framework.dart:5274:5)
#470 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#471 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#472 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#473 ProxyElement.update (package:flutter/src/widgets/framework.dart:5417:5)
#474 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:107:11)
#475 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#476 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#477 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5251:11)
#478 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#479 StatefulElement.update (package:flutter/src/widgets/framework.dart:5274:5)
#480 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#481 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#482 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5251:11)
#483 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#484 StatefulElement.update (package:flutter/src/widgets/framework.dart:5274:5)
#485 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#486 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6442:14)
#487 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#488 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6442:14)
#489 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#490 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#491 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#492 ProxyElement.update (package:flutter/src/widgets/framework.dart:5417:5)
#493 Element.updateChild (package:flutter/src/widgets/framework.dart:3686:15)
#494 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5111:16)
#495 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5251:11)
#496 Element.rebuild (package:flutter/src/widgets/framework.dart:4805:7)
#497 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2780:19)
#498 AutomatedTestWidgetsFlutterBinding.drawFrame (package:flutter_test/src/binding.dart:1394:19)
#499 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:358:5)
#500 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1290:15)
#501 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1220:9)
#502 AutomatedTestWidgetsFlutterBinding.pump.<anonymous closure> (package:flutter_test/src/binding.dart:1244:9)
#505 TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:68:41)
#506 AutomatedTestWidgetsFlutterBinding.pump (package:flutter_test/src/binding.dart:1230:27)
#507 WidgetTester.pumpAndSettle.<anonymous closure> (package:flutter_test/src/widget_tester.dart:702:23)
#510 TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:68:41)
#511 WidgetTester.pumpAndSettle (package:flutter_test/src/widget_tester.dart:695:27)
#512 main.<anonymous closure> (file:///b/s/w/ir/x/w/flutter/packages/flutter/test/material/about_test.dart:954:18)
<asynchronous suspension>
<asynchronous suspension>
(elided 5 frames from dart:async and package:stack_trace)
The SingleChildRenderObjectElement sending notification was:
Align
════════════════════════════════════════════════════════════════════════════════════════════════════
03:58 +5097 ~2 -1: /b/s/w/ir/x/w/flutter/packages/flutter/test/material/about_test.dart: ListView of license entries is primary (variant: TargetPlatform.linux) [E]
Test failed. See exception logs above.
The test description was: ListView of license entries is primary (variant: TargetPlatform.linux)
Source if the stack trace: https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8781676622559016513/+/u/run_test.dart_for_framework_tests_shard_and_subshard_libraries/test_stdout