SNA 4.0 SP2 May Cause Trap in Function RamWrite or CheckInboundQ

• Microsoft SNA Server, version 4.0SP2

SYMPTOMS

An application exception (trap) may occur at some point after installing Service Pack 2 for SNA Server 4.0. The function reporting the problem has been seen in either function RamWrite or function CheckInboundQ.

If you have Dr. Watson (Drwtsn32.exe) configured as the default debugger, a Drwtsn32.log file will be created in the [NTROOT] directory.

In addition to the Dr. Watson, a Snadump.log file will be created in the [SNAROOT\traces] directory. Both an event 4097 and 624 will get created in the application log of the Event Viewer with this occurs.

Drwtsn32.log example showing an exception in function RamWrite:

Application exception occurred:
        App: exe\snalink.dbg (pid=pid #)
        When: 3/16/1999 @ 14:45:28.559
        Exception number: c0000005 (access violation)
[..]
[..]
State Dump for Thread Id [Thread Id]

eax=85a3a2a8 ebx=6726acf0 ecx=b2c0b7e8 edx=00000001 esi=9706fb1c edi=00000002
eip=6722d085 esp=00bcfcbc ebp=00bcfcdc iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00000246


function: RamWrite
        6722d062 895004           mov     [eax+0x4],edx          ds:86ca8cae=8b045089
        6722d065 8b0b             mov     ecx,[ebx]              ds:6726acf0=01010054
        6722d067 8b35c8ac2667     mov     esi,[BmD (6726acc8)]   ds:6726acc8=01010000
        6722d06d 8b4128           mov     eax,[ecx+0x28]         ds:b3e7a1ee=3328418b
        6722d070 33c9             xor     ecx,ecx
        6722d072 894df8           mov     [ebp-0x8],ecx          ss:01e3e6e2=????????
        6722d075 894d10           mov     [ebp+0x10],ecx         ss:01e3e6e2=????????
        6722d078 8d0cc0           lea     ecx,[eax+eax*8]        ds:85a3a2a8=????????
        6722d07b 8945f4           mov     [ebp-0xc],eax          ss:01e3e6e2=????????
        6722d07e 8db4cedc3b0000   lea     esi,[esi+ecx*8+0x3bdc] ds:b2c0f3c4=????????
FAULT ->6722d085 395610           cmp     [esi+0x10],edx         ds:982de522=???????? 

Application exception occurred:
        App: exe\mngagent.dbg (pid=pid #)
        When: 11/3/1998 @ 7:28:50.734
        Exception number: c0000005 (access violation)
[..]
[..]
State Dump for Thread Id [Thread Id]

eax=00000000 ebx=00000000 ecx=033fffb0 edx=033fffa8 esi=77f1c67a edi=77f674e0
eip=67226860 esp=033fff5c ebp=033fff64 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00000246


function: CheckInboundQ
        67226850 55               push    ebp
        67226851 8bec             mov     ebp,esp
        67226853 51               push    ecx
        67226854 a1d85c2667       mov  eax,[BmD+0x10 (67265cd8)] ds:67265cd8=00000000
        67226859 56               push    esi
        6722685a 8945fc           mov     [ebp-0x4],eax          ss:0460e96a=????????
        6722685d 8b45fc           mov     eax,[ebp-0x4]          ss:0460e96a=????????
FAULT ->67226860 f0ff00           lock    inc dword ptr [eax]    ds:00000000=???????? 

CAUSE

This problem was due to a regression in the Snadmod.dll introduced in Service Pack 2.

RESOLUTION

To resolve this problem, obtain the latest service pack for SNA Server version 4.0. For additional information, please see the following article in the Microsoft Knowledge Base:

Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack

STATUS

Microsoft has confirmed this to be a problem in SNA Server 4.0 SP2. This problem was first corrected in SNA Server version 4.0 Service Pack 3.

Additional query words:

Keywords : sna4sp3fix
Version : WINDOWS:4.0SP2
Platform : WINDOWS
Issue type : kbbug