Errors When Performance Monitoring SNA Server
ID: Q169488
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The information in this article applies to:
-
Microsoft SNA Server, versions 3.0, 3.0 SP1
SYMPTOMS
When you initially activate Windows NT Server Performance Monitor to
collect SNA Server performance data, the following errors may occur:
- Perfmon.exe may encounter an access violation.
- If SNA Server is running on Windows NT Server 3.51, a Winlogon.exe
access violation may occur, leading to a STOP 0x0000001E error.
- If SNA Server is running on Windows NT Server 4.0, the following event
may be logged in the Windows NT application event log:
Event ID: 1013
Source: Perflib
Description:
The collect procedure in Extensible Counter DLL
"C:\SNA\system\snaperf.dll" for the "SnaServr" service returned a
buffer that was larger than the space allocated and may have
corrupted the application's heap. This DLL should be disabled or
removed from the system until the problem has been corrected to
prevent further corruption. The application accessing this
performance data should be restarted. The Performance data returned
by counter DLL will be not be returned in Perf Data Block. Overflow
size is data DWORD 0.
- If SNA Server is running on Windows NT 4.0, a winlogon.exe access
violation may occur, which would cause the following log entry in the
<ntroot>\drwtsn32.log file:
Application exception occurred:
App: exe\winlogon.dbg (<process ID>)
Exception number: c0000005 (access violation)
[...]
function: RtlAllocateHeap
[...]
FAULT ->77f64654 0fb716 movzx edx,word ptr [esi]
CAUSE
The SNA Server performance monitoring collection routine returns a Buffer
Size greater than the Perfmon buffer pointer allocated. The data
collection routines AddNodeCounters and AddRTMCounters write data to the
buffer, but fail to decrement the remaining byte count, which results
in the buffer write operation going past the end of the buffer.
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
With the fix, the code has been modified to decrement the remaining byte
count for the Node and RTM counter collections.
Additional query words:
crash blue
Keywords : kbnetwork snaserverservice kbfix3.00.sp2
Version : WINDOWS:3.0,3.0 SP1
Platform : WINDOWS
Issue type : kbbug