Microsoft KB Archive/180053

= SNA Server Access Violation in Function S1pimcrc =

Article ID: 180053

Article Last Modified on 9/22/2005

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APPLIES TO


 * Microsoft SNA Server 2.11 Service Pack 2
 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 2
 * Microsoft SNA Server 3.0 Service Pack 3
 * Microsoft SNA Server 4.0

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This article was previously published under Q180053



SYMPTOMS
The SNA Server service (Snaservr.exe) may fail unexpectedly with an access violation. When the problem occurs, all users connecting through SNA Server will lose their host sessions and the SNA Server service will no longer be running. The Windows NT application event log should indicate an Event 624, logged by SNA Server. Also, the following entry will be logged in the \Drwtsn32.log file, indicating an access violation in function "s1pimcrc":   Application exception occurred: App: snaservr.exe () Exception number: c0000005 (access violation)

[...]

State Dump for Thread Id 0x8c

eax=00000000 ebx=002bff62 ecx=000056f1 edx=04000400 esi=00cc4480 edi=00000000 eip=00426412 esp=002bff28 ebp=00000000 iopl=0 nv up ei pl nz ac po nc   cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00000216

function: s1pimcrc 004263f0 56              push    esi 004263f1 33c0            xor     eax,eax 004263f3 a0aa6f4800      mov     al,[sncurrnt (00486faa)] ds:00486faa=4a 004263f8 8d0440          lea     eax,[eax+eax*2]  ds:00000000=???????? 004263fb c1e002          shl     eax,0x2 004263fe 0fbf888ef64800  movsx  ecx,word ptr [eax+0x48f68e] ds:0048f68e=0000

00426405 8bb084f64800    mov     esi,[eax+0x48f684]     ds:0048f684=00000000 0042640b 8b048d7c3f4a00                ds:000056f1=???????? mov    eax,[s1seccb+0x1335c (004a3f7c)+ecx*4] FAULT ->00426412 80781701   cmp     byte ptr [eax+0x17],0x1 ds:005de922=??


 * > Stack Back Trace <*

FramePtr ReturnAd Param#1 Param#2  Param#3  Param#4  Function Name 00000000 00000000 00000000 00000000 00000000 00000000 snaservr!s1pimcrc 00000010 00000000 00000000 00000000 00000000 00000000 snaservr!



CAUSE
In one instance, the SNA Server failed to check if an LU6.2 control block was valid when receiving a message from a client machine.



STATUS
Microsoft has confirmed this to be a problem in SNA Server versions 2.11 SP2, 3.0, 3.0 SP1, 3.0 SP2 and 4.0.

This problem was corrected in the latest SNA Server versions 3.0 and 4.0 U.S. Service Packs. For information on obtaining these Service Packs, 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 KB180053

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