SNA Server Access Violation in function s1pcsgm.

• Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2

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 <ntroot>\drwtsn32.log file, indicating an access violation in snaservr.exe, in function s1pcsgm:

  
     Application exception occurred:
          App: snaservr.DBG (<process ID>)
          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

Additional query words:

Keywords : prodsna kbbug3.00 kbbug3.00.sp2 kbfix3.00.sp3 kbbug3.00.sp1 snaserverservice
Version : WINDOWS:3.0,3.0 SP1,3.0 SP2
Platform : WINDOWS
Issue type : kbbug