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Q169490: SNA Server Appears to Be Offline After MNGAGENT AV

Article: Q169490
Product(s): Microsoft SNA Server
Version(s): WINDOWS:3.0,3.0 SP1
Operating System(s): 
Keyword(s): kbnetwork
Last Modified: 13-JUN-2001

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The information in this article applies to:

- Microsoft SNA Server, versions 3.0, 3.0 SP1 
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SYMPTOMS
========

The access violation shown below may occur unexpectedly in the MNGAGENT process
running on an SNA Server computer. This will cause Manager to display the SNA
Server as offline, although the server may still be running properly. An
<Ntroot>\Drwtsn32.log entry may be created as follows:

  

  Application exception occurred:
     App: mngagent.DBG (<process id>)
     Exception number: c0000005 (access violation)

  function: CShrMemList::CShrMemList
  FAULT ->6098c555 ff4004           inc     dword ptr [eax+0x4]
  ds:0068e922=????????

CAUSE
=====

Under certain timing conditions, a Manage object is deleted while it is still
being used by another thread, leading to an access violation.

STATUS
======

Microsoft has confirmed this to be a problem in SNA Server version 3.0 and 3.0
Service Pack 1. This problem was corrected in the latest SNA Server version 3.0
U.S. Service Pack. For information on obtaining this Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):

  S E R V P A C K


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

When this access violation occurs, the stack back trace may look like the
following:

  *----> Stack Back Trace <----*

  FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
  0131fdac 60983c9c 00000000 00000001 0036d460 0036e370
     mngbase!CShrMemList::CShrMemList
  0131fdd0 01002dfe 0131fe2c 00008019 0d540018 0d552df8
     mngbase!CManage::GetUseCount
  0131fdf8 01003522 002e17e0 0036d460 0d540018 0000000a
     mngagent!CStdAgentProxy::SendCreate
  0131fe2c 0100cc0a 00000c96 0d549618 609829d0 003723c0
     mngagent!CStdAgentProxy::SendPendingUse
  0131fe64 01001e9c 00000000 0d549618 00372400 0036d7e0
     mngagent!CAgtPxyRecExchange::SendModifyUse
  0131fe8c 6098b267 0131fe9c 00000002 003723c0 00000c96
     mngagent!CStdAgentProxy::OnModify
  0131fea8 01008c95 61490c40 00000000 0121ffb8 77fa1773
     mngbase!CNotifyQueue::Dispatch
  0131ffb8 77f46c2e 0121ffb8 61490c40 00000000 0121ffb8
     mngagent!DoAgentProxy
  61490c40 1274c085 7401f883 02f8831a 01b85a74 c2000000
     kernel32!BaseThreadStart

Additional query words:

======================================================================
Keywords          : kbnetwork 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ300SP1
Version           : WINDOWS:3.0,3.0 SP1
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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