DOCUMENT:Q190087  07-AUG-1998  [vbwin]
TITLE   :BUG: Stop a Running Project From Immediate Window Crashes IDE
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:5.0
OPER/SYS:WINDOWS
KEYWORDS:

======================================================================
---------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Visual Basic Learning, Professional, and Enterprise Editions
   for Windows, version 5.0
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SYMPTOMS
========

In a Visual Basic project, attempting to create and show a large number of
modal forms and then stopping the application from running in the IDE will
either shut down Visual Basic 5.0 automatically or crash it and generate
the following message:

   VB5 caused a stack fault in module KERNEL32.DLL at 0137:bff725c5.

The crash occurs when you go into break mode, use the Immediate window, and
then stop the application in IDE.

This error does not occur if the application is run as a compiled EXE.

CAUSE
=====

Too many modal forms in a Visual Basic project will cause Visual Basic to
check numerous system message loops and go into an infinite loop, thus
creating a stack overflow. This may occur due to a low stack space as
numerous copies of a form are currently loaded modally.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products
listed at the beginning of this article. We are researching this
bug and will post new information here in the Microsoft Knowledge
Base as it becomes available.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Open a new Standard EXE project in Visual Basic. Form1 is created by
   Default.

2. Add a CommandButton (Command1) on Form1.

3. Paste the following code in Form1's code module:

      Private Sub Command1_Click()
         Dim x As Form1
         Set x = New Form1
         x.Show vbModal
      End Sub

4. Press the F5 key to run the project. Click Command1 39 times to create
   40 modal forms.

5. Press the CTRL+BREAK key combination to pause the project.

6. Press the CTRL+G key combination to bring up the Immediate window.

7. Type ? 1 in the Immediate window, and press the ENTER key.

8. Stop the project from running by clicking the Stop button on the
   toolbar.

   Note that while Visual Basic is closing all the modal forms, it
   eventually crashes and either shuts down or generates the following
   error message:

      VB5 caused a stack fault in module KERNEL32.DLL at 0137:bff725c5

Additional query words: kbDSupport kbVBp500bug kbIDE kbVBp kbdss
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Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbbug

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Copyright Microsoft Corporation 1998.