SNA Server Appears to Be Offline After MNGAGENT AV

The information in this article applies to:

• Microsoft SNA Server, versions 3.0 and 3.0 Service Pack 1 (SP1)

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

Keywords          : prodsna snamanager snaserverservice kbfix3.00.sp2 kbnetwork
Version           : 3.0
Platform          : WINDOWS
Solution Type     : kbfix