Microsoft KB Archive/178253

= SNA Server Access Violation in function s1pcsgm. =

Article ID: 178253

Article Last Modified on 9/22/2005

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APPLIES TO


 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 2

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This article was previously published under Q178253



SYMPTOMS
If one or more SNA Server connections are configured with "Supports Dynamic Remote APPC LU Definition", the SNA Server may encounter an unexpected access violation. This will cause the following symptoms:  The SNA Server service will end, coinciding with the following event logged to the Windows NT application event log:

Event ID: 624

Source: SNA Server

Description: Creating dump file SNADUMP.LOG for SNASERVR.EXE.

 The following log entry will be created in the \drwtsn32.log file, indicating an access violation in snaservr.exe, in function s1pcsgm:

  Application exception occurred: App: snaservr.DBG () Exception number: c0000005 (access violation)

State Dump for Thread Id 0x8d

eax=00f50000 ebx=00000207 ecx=00000000 edx=00000009 esi=00e40000 edi=00000000 eip=002b7879 esp=00e4fe98 ebp=001d0008 iopl=0 nv up ei pl nz na po nc  cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000 efl=00000206

function: s1pcsgm 002b7860 668b4c2404      mov     cx,[esp+0x4]  ss:0149e7bc=???? 002b7865 56              push    esi 002b7866 6633f6          xor     si,si 002b7869 57              push    edi 002b786a 0fbfc1          movsx   eax,cx 002b786d 8d0440          lea     eax,[eax+eax*2] ds:00f50000=01110100 002b7870 c1e003          shl     eax,0x3 002b7873 0305a8043400    add     eax,[sct (003404a8)] ds:003404a8=00f50000 FAULT ->002b7879 8a50ea          mov     dl,[eax-0x16] ds:0159e922=??


 * > Stack Back Trace <*

FramePtr ReturnAd Param#1 Param#2  Param#3  Param#4  Function Name 00e4fe9c 002b232a 00000000 00e4feca 001defe0 001dbbb0 snaservr!s1pcsgm 00e4ff04 002b9ff1 00000000 00000000 00010018 00000000 snaservr!s1pcprlu 00e4ff54 002ba58f 000000ff 00000004 0000003d 00000000 snaservr!s1practs 00e4ff68 002d8bcc 0030d042 0000001e 00e4ffec 00143248 snaservr!s1prmrcv 00e4ff6c 0030d042 0000001e 00e4ffec 00143248 00000002 snaservr!s1pgdisp 00e4ff88 0030d7f5 009811c0 00000002 00143248 77fac8a0 snaservr!sbpsched 00e4ff8c 009811c0 00000002 00143248 77fac8a0 00143240 snaservr!sbpgmain 00e4ffa8 77e3167a 00000002 00143248 77e50000 77f46c2e snasvc!ServiceMainFunction





CAUSE
The SNA Server was attempting to access an invalid array element which caused the access violation.



WORKAROUND
Obtain the hotfix described below, or reconfigure the connection so that it no longer supports dynamic definition of Remote APPC LU's.



STATUS
Microsoft has confirmed this to be a problem in SNA Server version 3.0 (including SP1 and SP2).

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

Keywords: kbbug kbfix kbqfe kbhotfixserver KB178253

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