VM crash: DirectoryWatchHandle::Stop() is invoked after handle is released

[aam]

From Dart-Code/Dart-Code#2814 Dart vm runtime crashes when FileSystemWatcher broadcastController onCancel is invoked, that calls unwatchPath, that calls DirectoryWatchHandler::Stop for the DirectoryWatchHandle that seems to be already released(its ref_count is 0, monitor_ is 0):

 	[Inline Frame] dart.exe!dart::bin::MonitorLocker::MonitorLocker(dart::bin::Monitor * monitor) Line 33
 	dart.exe!dart::bin::DirectoryWatchHandle::Stop() Line 427
>	dart.exe!dart::NativeEntry::AutoScopeNativeCallWrapperNoStackCheck(_Dart_NativeArguments * args, void(*)(_Dart_NativeArguments *) func) Line 218

[vytautas-pranskunas-]

watching

[aam]

https://dart-review.googlesource.com/c/sdk/+/169601 with potential fix

[szerner]

https://dart-review.googlesource.com/c/sdk/+/169601 with potential fix

Based on some Windows crash dumps that I was able to share with @aam he sent me an experimental dart SDK with this fix for testing purposes.

And I didn't note a single crash and "Dart Analyzer has terminated" messages during some hours of flutter development today. So this issue seems to be on a good way to be solved.

[tudor07]

I still have this issue

Flutter 1.22.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 8874f21e79 (5 days ago) • 2020-10-29 14:14:35 -0700
Engine • revision a1440ca392
Tools • Dart 2.10.3

[szerner]

I still have this issue

Flutter 1.22.3 • channel stable • https://github.com/flutter/flutter.git
...

The fix mentioned here

https://dart-review.googlesource.com/c/sdk/+/169601 with potential fix

is not yet part of any current flutter channel, not even dev. So we'll have to wait until one of the flutter releases is bundled with at least dart sdk 2.12.0-8.0.dev, which seems to be the first to contain it (follow the link to the fix and then click on 'INCLUDED IN').