FIX: GPF/UAE with Huge Array Size as Multiple of 64K Bytes (98990)

The information in this article applies to:

Microsoft Visual Basic Standard Edition for Windows 2.0
Microsoft Visual Basic Professional Edition for Windows 2.0

This article was previously published under Q98990

SYMPTOMS

A general protection (GP) fault or Unrecoverable Application Error (UAE) may result when you define a huge array using DIM, REDIM, or GLOBAL and specify a size that's a multiple of 64K.

CAUSE

Huge arrays that cause a GP fault or UAE are a(n), where n is 4094 + 4095*i for i = 1 to 7 (assuming 16-byte element sizes). The problem occurs when the array plus its overhead fills a space of 128K and each increment of 64K exactly.

WORKAROUND

To work around the problem, add or subtract one element in the array.

STATUS

Microsoft has confirmed this to be a bug in Microsoft Visual Basic version 2.0 for Windows. This bug was corrected in Microsoft Visual Basic version 3.0 for Windows.

MORE INFORMATION

Steps to Reproduce the Problem

Start Visual Basic, or if Visual Basic is already running, choose New Project from the File menu (ALT, F, N).

Add the following code to the Form_Click event procedure of Form1:

   Form_Click ()
       ReDim A(32759) As Variant
   End Sub

From the Run menu, choose Start (ALT, R, S).

At this point, a GP fault or UAE occurs. The GP fault address is 0001:0CA2.

Modification Type:	Major	Last Reviewed:	10/30/2003
Keywords:	kbbug kbfix KB98990