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Watcher list disappeared

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
30/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
visualbasic
Domain
desktop, operating-systems

Research direction

Start with CompactGUI.Core.Analyser.AnalyseFolder and follow the call path through GetAnalysedFilesAsync, Watcher.Analyse, ParseWatchers, and RunWatcher. Reproduce the failure around the reported .NET 9.0.11 update and determine how the missing System.Linq.Parallel assembly affects watcher processing. Done means the crash is handled or prevented and the watcher list is not lost.

Written by the indexing model from the issue text.

Description

I used it for 20 days, someday the entire watcher list disappeared. I found this crash in Event Viewer:

Application: CompactGUI.exe
CoreCLR Version: 9.0.1025.47515
.NET Version: 9.0.10
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException: 
File name: 'System.Linq.Parallel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at CompactGUI.Core.Analyser.AnalyseFolder(CancellationToken cancellationToken)
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
   at CompactGUI.Core.Analyser.AnalyseFolder(CancellationToken cancellationToken)
   at CompactGUI.Core.Analyser.GetAnalysedFilesAsync(CancellationToken token)
   at CompactGUI.Watcher.Watcher.Analyse(String folder, Boolean checkDiskModified, CancellationToken cToken)
   at CompactGUI.Watcher.Watcher.ParseWatchers(Boolean ParseAll, CancellationToken cToken)
   at CompactGUI.Watcher.Watcher.RunWatcher(Boolean runAll, CancellationToken cToken)
   at CompactGUI.Watcher.Watcher.OnSystemIdle()
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---w
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at CompactGUI.Application.Main()

Time of the crash coincides with a Windows update 2025-11 .NET 9.0.11 Update for x64 Client (KB5071067). This suggests the update mechanism is not secure enough to not break apps. However, the watcher list being lost suggests another bug.

Windows 11 24H2 26100.7171
4.0 beta6

Dominant language
Visual Basic .NET
Stars
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Forks
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Avg merge
3d 18h
Merged PRs (30d)
7

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