DOCUMENT:Q248498 08-MAY-2002 [sna] TITLE :Win32 CPIC Application May Stop Unexpectedly PRODUCT :Microsoft SNA Server PROD/VER::4.0,4.0 SP1,4.0 SP2,4.0 SP3 OPER/SYS: KEYWORDS:kbSNA400sp4fix kbSNA400PreSP4fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 - Microsoft Host Integration Server 2000 ------------------------------------------------------------------------------- SYMPTOMS ======== If a Win32 CPIC application is supporting multiple conversations using non-blocking mode, the application may stop unexpectedly while issuing a new CMINIT (Initialize_Conversation). CAUSE ===== Under certain circumstances, the Win32 CPIC and APPC libraries can get into a deadlock condition. Note that the CPIC library (Wcpic32.dll) communicates through the APPC library (Wappc32.dll). The deadlock can occur under the following circumstances: - When CMINIT issues a TP_STARTED while holding an internal CPIC critical section. If another APPC verb completes asynchronously while the TP_STARTED is running, the CPIC application may deadlock. - When the CPIC library calls into WinAPPCCancelConversation() while holding the internal CPIC critical section. The thread that makes this call immediately blocks while trying to obtain the APPC critical section, which is held by the APPC callback thread, which is waiting for CPIC lock. RESOLUTION ========== To resolve this problem, obtain the latest service pack for SNA Server 4.0. For additional information, please see the following article in the Microsoft Knowledge Base: Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack Host Integration Server 2000: A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. This fix may receive additional testing at a later time, to further ensure product quality. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Host Integration Server (HIS) 2000 Service Pack that contains this fix. To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this fix should have the following file attributes or later: +------------------------------------+ | File name | Date | Time | +------------------------------------+ | Wcpic32.dll | 01/02/2001 | 10:06am | +------------------------------------+ NOTE: Because of file dependencies, the most recent fix that contains the above files may also contain additional files. STATUS ====== Microsoft has confirmed this to be a problem in Microsoft SNA Server version 4.0, 4.0 SP1, 4.0 SP2 and 4.0 SP3. This problem was first corrected in SNA Server 4.0 Service Pack 4. Microsoft has confirmed this to be a problem in Microsoft Host Integration Server 2000. Additional query words: ====================================================================== Keywords : kbSNA400sp4fix kbSNA400PreSP4fix Technology : kbAudDeveloper kbSNAServSearch kbHostIntegServ2000 kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 Version : :4.0,4.0 SP1,4.0 SP2,4.0 SP3 Issue type : kbbug Solution Type : kbfix ============================================================================= 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 2002.