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[flutter_tools] Forcefully kill hung subprocesses 5 seconds after timeout - #187178
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This pull request introduces a 5-second fallback timer to forcefully kill a hung process during integration tests in transition_test_utils.dart, and adds a corresponding test in transition_test_utils_test.dart to verify this behavior. The review feedback points out that the newly created Timer is not cancelled if the process exits successfully on its own, which can leak resources. It is recommended to store the timer and cancel it when the process exits.
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…eout Update the `runFlutter` test runner helper inside `transition_test_utils.dart` to forcefully terminate hung subprocesses if they fail to exit within a 5-second grace period after a transition timeout occurs and the graceful shutdown character `q` is sent to `stdin`. Additionally, we store this backup `Timer` in a local variable and cancel it immediately once `process.exitCode` completes to prevent any resource leaks in subsequent test suites. Wrote a new integration test inside `transition_test_utils_test.dart` to assert and guarantee this force-kill behavior. Fixes flutter#186449
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Address Dart analysis warnings and formatting issues introduced in the force-kill implementation. - Omit obvious local variable types for `timer` in `transition_test_utils.dart` and `threwTestFailure` in `transition_test_utils_test.dart`. - Specify type for non-obvious local variable `elapsedSeconds` in `transition_test_utils_test.dart`. - Remove unused `dart:async` import in `transition_test_utils_test.dart`. - Remove unnecessary `print` statement in `transition_test_utils_test.dart`. - Increase the upper bound check for elapsed time in the test to 30 seconds to prevent flakiness on slow CI bots. Related to flutter#187178
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| // Start a timer to kill the process if it still hasn't exited after 5 seconds. | ||
| final timer = Timer(const Duration(seconds: 5), () { | ||
| debugPrint('${stamp()} (process still did not quit, killing forcefully)'); | ||
| process.kill(); |
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process.kill() sends a SIGTERM by default. Would we want to send a SIGKILL instead?
Address review comment: use ProcessSignal.sigkill when forcefully killing the subprocess to prevent leaks and ensure it terminates properly.
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autosubmit label was removed for flutter/flutter/187178, because - The status or check suite Linux tool_integration_tests_3_7 has failed. Please fix the issues identified (or deflake) before re-applying this label. |
…est_utils Add '-a' option to the '/usr/bin/xvfb-run' invocation. This automatically allocates a free server number, preventing virtual display conflicts and reducing flakiness when running integration tests concurrently on CI bots.
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…12169) Manual roll Flutter from 91939cc4db78 to dc2a8703e12b (50 revisions) Manual roll requested by bensonluk@google.com flutter/flutter@91939cc...dc2a870 2026-07-09 chris@bracken.jp [ios,macos] Update swiftc.py flags to match swiftc (flutter/flutter#189174) 2026-07-09 jesswon@google.com [AGP 9] Update Warn Version to AGP 9+ (flutter/flutter#189109) 2026-07-09 154381524+flutteractionsbot@users.noreply.github.com Sync CHANGELOG.md from stable (flutter/flutter#189203) 2026-07-09 mdebbar@google.com [web] Roll Chrome to 145 (framework) (flutter/flutter#182861) 2026-07-09 engine-flutter-autoroll@skia.org Roll Packages from 52d84d6 to 20928d5 (6 revisions) (flutter/flutter#189194) 2026-07-09 zhongliu88889@gmail.com [web] Avoid absolute positioning for base CanvasKit canvas (flutter/flutter#188337) 2026-07-09 engine-flutter-autoroll@skia.org Roll Dart SDK from cdb7217e65aa to a11fb7ed40a5 (6 revisions) (flutter/flutter#189195) 2026-07-09 matt.kosarek@canonical.com Fix dereference of nullptr in the moved-to-rect signal in the Linux embedder (flutter/flutter#189152) 2026-07-09 katelovett@google.com Fix data for design packages (flutter/flutter#189140) 2026-07-09 engine-flutter-autoroll@skia.org Roll Skia from 7b42d1251d54 to ab3a7b98c94d (2 revisions) (flutter/flutter#189181) 2026-07-09 engine-flutter-autoroll@skia.org Roll Skia from 05d9d214e0b7 to 7b42d1251d54 (2 revisions) (flutter/flutter#189175) 2026-07-09 engine-flutter-autoroll@skia.org Roll Skia from 542c8bdd7f4f to 05d9d214e0b7 (4 revisions) (flutter/flutter#189169) 2026-07-09 97480502+b-luk@users.noreply.github.com UberSDF rect handling for thin (line-like) rectangles (flutter/flutter#188821) 2026-07-09 engine-flutter-autoroll@skia.org Roll Skia from dd572c07f63c to 542c8bdd7f4f (4 revisions) (flutter/flutter#189160) 2026-07-09 markzipan@google.com [flutter_tools] Fix hot restart for WASM web builds (flutter/flutter#187898) 2026-07-08 robert.ancell@canonical.com Split FlViewRenderer into OpenGL and software backends (flutter/flutter#188824) 2026-07-08 awolff@google.com Promote android_hardware_smoke_tests out of bringup in CI (flutter/flutter#189081) 2026-07-08 engine-flutter-autoroll@skia.org Roll Skia from 8df24be66531 to dd572c07f63c (4 revisions) (flutter/flutter#189150) 2026-07-08 matt.kosarek@canonical.com Expose LinuxWindowRegistrar on _window_linux.dart in order to better support out of tree LinuxWindowingOwners (flutter/flutter#188917) 2026-07-08 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#189149) 2026-07-08 codefu@google.com fix(ci): harden some workflows (flutter/flutter#189087) 2026-07-08 engine-flutter-autoroll@skia.org Roll Skia from 51a62da33da0 to 8df24be66531 (1 revision) (flutter/flutter#189139) 2026-07-08 iinozemtsev@google.com Roll Dart SDK to Dart 3.13 beta3 (flutter/flutter#189122) 2026-07-08 digvijaysinghiam@gmail.com [flutter_tools] Don't crash on non-UTF-8 plugin pubspec.yaml (flutter/flutter#188976) 2026-07-08 bkonyi@google.com [flutter_tools] Watch transitive #include headers for FragmentProgram hot reload (flutter/flutter#187945) 2026-07-08 engine-flutter-autoroll@skia.org Roll Skia from 040d9f55de00 to 51a62da33da0 (1 revision) (flutter/flutter#189135) 2026-07-08 engine-flutter-autoroll@skia.org Roll Packages from 92525f5 to 52d84d6 (7 revisions) (flutter/flutter#189134) 2026-07-08 bkonyi@google.com [flutter_tools] Forcefully kill hung subprocesses 5 seconds after timeout (flutter/flutter#187178) 2026-07-08 malo.allee@gmail.com Expose the app's build name and number as compile-time constants (flutter/flutter#187935) 2026-07-08 engine-flutter-autoroll@skia.org Roll Skia from 1ff92f879815 to 040d9f55de00 (1 revision) (flutter/flutter#189131) 2026-07-08 engine-flutter-autoroll@skia.org Roll Skia from 6137414bef5c to 1ff92f879815 (6 revisions) (flutter/flutter#189126) 2026-07-08 brackenavaron@gmail.com [test cross imports] More test/rendering + flutter_test/test fixes (flutter/flutter#188954) 2026-07-08 112751483+shivanshu877@users.noreply.github.com engine: explain why each candidate build was skipped in Flutter web loader (flutter/flutter#186254) 2026-07-08 chris@bracken.jp vscode: add missing unicode.h (flutter/flutter#189102) 2026-07-08 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 7RjQJBW3m-3Jl-7jr... to QcRFUtvCw2EobfJ8s... (flutter/flutter#189104) 2026-07-08 engine-flutter-autoroll@skia.org Roll Skia from 075fbe4778d9 to 6137414bef5c (10 revisions) (flutter/flutter#189106) 2026-07-08 112751483+shivanshu877@users.noreply.github.com engine: warn on WASM load failure when not crossOriginIsolated (flutter/flutter#186252) 2026-07-08 engine-flutter-autoroll@skia.org Roll Dart SDK from c9bccc09e733 to db2155f56bf3 (2 revisions) (flutter/flutter#189105) 2026-07-08 bkonyi@google.com [flutter_tools] Prevent interactive device selection in machine mode (flutter/flutter#188267) 2026-07-08 bkonyi@google.com [flutter_tools] Fix wireless ADB device discovery when serial contains spaces (flutter/flutter#187943) 2026-07-07 zhongliu88889@gmail.com [web] Fix grouped autofill on iOS Chrome (flutter/flutter#187459) 2026-07-07 rmolivares@renzo-olivares.dev Fix TextSelectionOverlay crash when layout is degenerate (flutter/flutter#188672) 2026-07-07 87962825+kyungilcho@users.noreply.github.com [flutter_tools] Provision Android NDK in the main Gradle invocation (flutter/flutter#186337) 2026-07-07 awolff@google.com Android_hardware_smoke_test: Migrate to AGP 9 (flutter/flutter#189082) ...
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This PR resolves indefinite hangs inside
runFlutteron Windows. In its timeout handler, after sending the graceful shutdown characterq, we start a 5-secondTimerthat forcefully kills the process viaprocess.kill()if it fails to exit.Additionally, we store this backup
Timerin a local variable and cancel it immediately onceprocess.exitCodecompletes to prevent any resource/timer leaks in subsequent test suites.Wrote a new integration test inside
transition_test_utils_test.dartto assert and guarantee this force-kill behavior.Fixes #186449