DOCUMENT:Q125173 08-AUG-2001 [winnt] TITLE :Calling a 32-bit Application From WOW Causes Memory Leak PRODUCT :Microsoft Windows NT PROD/VER:3.5 OPER/SYS: KEYWORDS:kbnetwork ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 3.5 - Microsoft Windows NT Server version 3.5 ------------------------------------------------------------------------------- SYMPTOMS ======== An application that uses the 16 bit-subsystem (WOW) to call a 32-bit application repetitively will exhibit a memory leak. Memory is lost during this automated process and appears as a memory leak in Performance Monitor. This can be verified by monitoring MEMORY: Pool Paged Bytes, Pool NonPaged Bytes and Committed Bytes. Eventually the system starts to thrash for bytes to use during the process and appears to make no progress. In cases where the problem occurs on an NTFS partition, the following STOP message appears: STOP 0x4d(0x0000000B, 0x2010,0x0, 0x4594) NO_PAGES_AVAILABLE P4-0300 irql:1f SYSVER 0xf0000327 This problem does not occur when calling a 16-bit application from the 16- bit subsystem. WORKAROUND ========== To avoid this problem, call only 16-bit applications from a 16-bit subsystem. STATUS ====== Microsoft has confirmed this to be a problem in Windows NT Workstation and Windows NT Server version 3.5. This problem was corrected in the latest U.S. Service Pack for Windows NT version 3.5. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K Additional query words: prodnt blue trap vdm fatal ====================================================================== Keywords : kbnetwork Technology : kbWinNTsearch kbWinNTWsearch kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTSsearch kbWinNTS350 kbWinNTS350search Version : 3.5 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.