Microsoft KB Archive/169490

= SNA Server Appears to Be Offline After MNGAGENT AV =

Article ID: 169490

Article Last Modified on 6/24/2004

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APPLIES TO


 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 4

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This article was previously published under Q169490





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 \Drwtsn32.log entry may be created as follows:

  Application exception occurred: App: mngagent.DBG 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: kbbug kbfix kbnetwork KB169490

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