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[flutter_tools] Fix crash in symbolize command on stream error - #191273

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bkonyi:issue-191205
Aug 20, 2026
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[flutter_tools] Fix crash in symbolize command on stream error#191273
auto-submit[bot] merged 4 commits into
flutter:masterfrom
bkonyi:issue-191205

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@bkonyi bkonyi commented Aug 18, 2026 •
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Ensure the stream subscription in DwarfSymbolizationService.decodeWithUnits sets cancelOnError: true. When an error occurs in the stream, this automatically cancels the subscription and prevents onDone from being invoked after onError, avoiding a StateError from completing the completer a second time.

Fixes #191205

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@bkonyi
[flutter_tools] Fix crash in symbolize command on stream error
2673393 
Ensure the completer used to signal completion of symbolization is
not completed multiple times if an error occurs. Guarding the
completer calls with `isCompleted` prevents a `StateError` from
being thrown when the stream is subsequently closed after an error.

Fixes flutter#191205
@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Aug 18, 2026
@github-actions github-actions Bot added the tool Affects the "flutter" command-line tool. See also t: labels. label Aug 18, 2026
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Code Review

This pull request updates the DwarfSymbolizationService to prevent crashes during stream error handling by checking if the completer is already completed before calling complete or completeError. It also adds a regression test to verify this behavior. The review feedback suggests simplifying this implementation by using cancelOnError: true in the stream subscription, which automatically prevents subsequent events after an error.

Comment thread packages/flutter_tools/lib/src/commands/symbolize.dart Outdated
@moodstubos moodstubos mentioned this pull request Aug 18, 2026
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bkonyi requested a review from dcharkes August 20, 2026 16:27
@bkonyi bkonyi added the autosubmit Merge PR when tree becomes green via auto submit App label Aug 20, 2026
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auto-submit Bot added this pull request to the merge queue Aug 20, 2026
Merged via the queue into flutter:master with commit dcc19d4 Aug 20, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Aug 20, 2026
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auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Aug 22, 2026
@engine-flutter-autoroll
Roll Flutter from c2437523d308 to 65c9a8dc60bc (195 revisions) (#12554)
9cb9cc4 
Roll Flutter from c2437523d308 to 65c9a8dc60bc (195 revisions)

flutter/flutter@c243752...65c9a8d

2026-08-22 engine-flutter-autoroll@skia.org Roll ICU from d578f2e8b7bd to 8cc91d9b6ab9 (1 revision) (flutter/flutter#191542)
2026-08-22 engine-flutter-autoroll@skia.org Roll Skia from 666a9b3d5cf0 to ad2106c0bb64 (3 revisions) (flutter/flutter#191527)
2026-08-22 engine-flutter-autoroll@skia.org Roll Fuchsia Test Scripts from KaOq3EE4qJ9fnaaaK... to 0iCv10IlKfiilEBOU... (flutter/flutter#191524)
2026-08-22 bkonyi@google.com [flutter_tools] Add tests for negative lookahead regex in test runner and batch entrypoints (flutter/flutter#191438)
2026-08-22 engine-flutter-autoroll@skia.org Roll Skia from 0c37868737fa to 666a9b3d5cf0 (2 revisions) (flutter/flutter#191518)
2026-08-21 10456171+caroqliu@users.noreply.github.com Revert "[input] Migrate fuchsia.ui.pointerinjector to TouchSource (#190855) (flutter/flutter#191509)
2026-08-21 30870216+gaaclarke@users.noreply.github.com Fixes windows gallery benchmarks by forcing mobile layout (flutter/flutter#191507)
2026-08-21 bkonyi@google.com [flutter_tools] Restrict WebAssetServer source resolution to source map extensions (flutter/flutter#191501)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from f6900c5b8439 to 0c37868737fa (2 revisions) (flutter/flutter#191504)
2026-08-21 bkonyi@google.com Refactor `FlutterDevice.connect` and VM service discovery (flutter/flutter#191221)
2026-08-21 bkonyi@google.com [flutter_tools] Fix crash when migrating flow-style exclude lists in analysis_options.yaml (flutter/flutter#191269)
2026-08-21 269567208+reidbaker-agent@users.noreply.github.com [rules] Add packages/flutter_tools/gradle/AGENTS.md rules (flutter/flutter#191486)
2026-08-21 kevmoo@users.noreply.github.com [flutter_tools] refactor CLI argument architecture with typed option descriptors and bundles (PoC) (flutter/flutter#191018)
2026-08-21 bkonyi@google.com tools: Extract Dart SDK to temp directory before moving to final location (flutter/flutter#191263)
2026-08-21 1961493+harryterkelsen@users.noreply.github.com [web] Move CanvasKit fragment shader classes to canvaskit/fragment_shader.dart (flutter/flutter#191451)
2026-08-21 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from GCQlmt6h-esJsNubS... to ic6GjOSn-KN508XyK... (flutter/flutter#191485)
2026-08-21 bkonyi@google.com [Widget Preview] Isolate PageStorage scope in widget preview group expansion tile (flutter/flutter#191378)
2026-08-21 bkonyi@google.com [flutter_tools] Deprecate --build and --no-build flags on flutter run (flutter/flutter#191358)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from 70988bed1b3b to f6900c5b8439 (2 revisions) (flutter/flutter#191481)
2026-08-21 engine-flutter-autoroll@skia.org Roll Packages from 1785501 to 252bb33 (6 revisions) (flutter/flutter#191480)
2026-08-21 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 20IJas24bZiNmCZTK... to GCQlmt6h-esJsNubS... (flutter/flutter#191415)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from 2ba6971bd0d1 to 70988bed1b3b (2 revisions) (flutter/flutter#191476)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from 1d5f72537ba6 to 2ba6971bd0d1 (2 revisions) (flutter/flutter#191473)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from 2c25efd2e369 to 1d5f72537ba6 (1 revision) (flutter/flutter#191472)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from 09b1b810850a to 2c25efd2e369 (9 revisions) (flutter/flutter#191470)
2026-08-21 flar@google.com [Impeller] fix position of cached single glyph text shadows (flutter/flutter#191325)
2026-08-21 engine-flutter-autoroll@skia.org Roll Skia from abdf8821f313 to 09b1b810850a (15 revisions) (flutter/flutter#191458)
2026-08-21 me@bnsaed.com Document that programmatic TextEditingController changes do not run input formatters (flutter/flutter#190166)
2026-08-21 30870216+gaaclarke@users.noreply.github.com Adds new gallery benchmarks to windows (skia and impeller) (flutter/flutter#191454)
2026-08-21 chris@bracken.jp iOS: Deprecate FlutterEngine.isGpuDisabled (flutter/flutter#191393)
2026-08-21 154381524+flutteractionsbot@users.noreply.github.com Revert: [web] Unskip decoration image lerp tests (flutter/flutter#191462)
2026-08-20 awolff@google.com android_hardware_smoke_test: Improve reliability (flutter/flutter#191374)
2026-08-20 77467499+wilyan09007@users.noreply.github.com Don't size or offset the Android platform view before it is laid out (flutter/flutter#190895)
2026-08-20 15619084+vashworth@users.noreply.github.com [iOS][add2app] Skip building SwiftPM plugins when generating CocoaPods artifacts (flutter/flutter#190736)
2026-08-20 33794642+FelixMittermeier@users.noreply.github.com Optimize JSONMessageCodec UTF-8 conversion (flutter/flutter#190529)
2026-08-20 bkonyi@google.com [FML] Replace deprecated wstring_convert with Win32 APIs (flutter/flutter#191394)
2026-08-20 victorsanniay@gmail.com SliverFillRemaining extends beyond viewport size when fillOverscroll is true (flutter/flutter#191236)
2026-08-20 bkonyi@google.com [flutter_tools] Update argParser usageLineLength when --wrap-column is passed (flutter/flutter#191264)
2026-08-20 bkonyi@google.com [flutter_tools] Fix UNC path resolution in depfile parsing on Windows (flutter/flutter#191265)
2026-08-20 1961493+harryterkelsen@users.noreply.github.com [web] Unskip decoration image lerp tests (flutter/flutter#191426)
2026-08-20 bkonyi@google.com Do not inject 'type' and 'method' into service extension responses (flutter/flutter#190946)
2026-08-20 bkonyi@google.com [flutter_tools] Fix crash in symbolize command on stream error (flutter/flutter#191273)
2026-08-20 bkonyi@google.com [flutter_tools] Prevent deletion of shared native asset hooks outputs as stale (flutter/flutter#191272)
2026-08-20 bkonyi@google.com [flutter_tools] Support package wildcard assets in app pubspec (flutter/flutter#191266)
2026-08-20 108678139+manu-sncf@users.noreply.github.com Add SliverClipRect and SliverClipRRect (flutter/flutter#179003)
2026-08-20 bkonyi@google.com [flutter_tools] Implement Diagnostics extension slice and doctor integration (flutter/flutter#191162)
...
@bkonyi bkonyi added the cp: stable cherry pick this pull request to stable release candidate branch label Aug 24, 2026
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@dcharkes dcharkes dcharkes approved these changes
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Crash while reading an obfuscated stack trace > flutter symbolize > Bad state: Future already completed

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