WPF crashing by Environment.FailFast

Question

I am working on WPF application built for Kiosk (Touch Screen). We build Virtual Keyboard for ourselves.

There is one screen we list some items (max of 4 items) using DataGrid control which has a TextBox. The virtual keyboard shows on focus (thats how it built).

When we make selecting different items randomly, the application crashes without reaching the generic exception handler. This issue is repeatable on Touch screen, but not in regular screens. The event log shows the below,

Application: CashNGo.WPF.exe
Framework Version: v4.0.30319
Description: The application requested process termination through System.Environment.FailFast(string
message).
Message: Unrecoverable system error.
Stack:
   at System.Environment.FailFast(System.String)
   at MS.Internal.Invariant.FailFast(System.String, System.String)
   at MS.Internal.Invariant.Assert(Boolean, System.String)
   at System.Windows.Documents.TextStore.VerifyTextStoreConsistency()
   at System.Windows.Documents.TextStore.GrantLock()
   at System.Windows.Documents.TextStore.GrantLockWorker(LockFlags)
   at System.Windows.Documents.TextStore.RequestLock(LockFlags, Int32 ByRef)
   at MS.Win32.UnsafeNativeMethods+ITextStoreACPSink.OnSelectionChange()
   at System.Windows.Documents.TextStore.OnSelectionChanged()
   at System.Windows.Documents.TextSelection.System.Windows.Documents.ITextRange.NotifyChanged(Boolean,
Boolean)
   at System.Windows.Documents.TextRangeBase.EndChange(System.Windows.Documents.ITextRange,
Boolean, Boolean)
   at System.Windows.Documents.TextSelection.System.Windows.Documents.ITextRange.Select(System.Windows.Documents.ITextPointer,
System.Windows.Documents.ITextPointer)
   at System.Windows.Controls.TextBox.Select(Int32, Int32)
   at System.Windows.Controls.TextBox.set_CaretIndex(Int32)
   at Common.Controls.SoftKeyboard.<.cctor>b__1c(System.Windows.Controls.TextBox)
   at System.Windows.Input.DelegateCommand`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089]].Execute(System.__Canon)
   at Common.Controls.SoftKeyboard+<>c__DisplayClass5.<SoftKeyboardFocus_Changed>b__0()
   at System.Windows.Threading.Dispatcher.Invoke(System.Action, System.Windows.Threading.DispatcherPriority,
System.Threading.CancellationToken, System.TimeSpan)
   at System.Windows.Threading.Dispatcher.Invoke(System.Action, System.Windows.Threading.DispatcherPriority)
   at Common.Extensions+<>c__DisplayClass1.<DelayedInvoke>b__0(System.Object, System.EventArgs)
   at System.Windows.Threading.DispatcherTimer.FireTick(System.Object)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object,
Int32)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate,
System.Object, Int32, System.Delegate)
  at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback,
System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback,
System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback,
System.Object)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean
ByRef)
   at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object,
Int32)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate,
System.Object, Int32, System.Delegate)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority,
System.TimeSpan, System.Delegate, System.Object, Int32)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
   at System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(System.Object)
   at System.Windows.Application.RunInternal(System.Windows.Window)
   at System.Windows.Application.Run(System.Windows.Window)
   at System.Windows.Application.Run()
   at CashNGo.WPF.App.Main()

I did some search and found http://social.msdn.microsoft.com/Forums/vstudio/en-US/dfbd2526-8953-4ce8-97c2-43246fd251c0/wpf-framework-crashing-on-setting-foxus-in-textbox?forum=wpf which is exactly the same exception.

Any suggestion would be helpful.

Answer 1

Disabling the Windows service fixed the issue in my case too. On my Windows 8.1 Pro the service is called "Touch Keyboard and Handwriting Panel Service"

Answer 2

Turn off a windows service called.

Tablet PC Input Service