Microsoft KB Archive/176188

= SNA Link Access Violation in ibmx25!os_wtime =

Article ID: 176188

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 Q176188





SYMPTOMS
The SNA Link Service (snalink.exe) may fail with an access violation in ibmx25!os_wtime when the X.25 link to the host is down for an extended period of time. Also, an Event ID 320 with an error code of 0xc0000023 (STATUS_BUFFER_TOO_SMALL) may be logged in the Windows NT Event Viewer Application log.

The failure may be recorded in the \DRWTSN32.LOG file as follows:

  Application exception occurred: App: exe\snalink.DBG (pid=120) When: 9/24/1997 @ 17:26:12.627 Exception number: c0000005 (access violation)

[...]

State Dump for Thread Id 0x7f

eax=00000000 ebx=00000000 ecx=00000000 edx=67274840 esi=00000000 edi=007e0148 eip=007d75ab esp=0119ff4c ebp=000000ff iopl=0   nv up ei pl zr na po nc   cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 efl=00000246

function: os_wtime 007d75a0 6a01            push    0x1 007d75a2 e859fdffff      call    os_ftask (007d7300) 007d75a7 8b4c2404        mov     ecx,[esp+0x4] ss:024ae953=???????? FAULT ->007d75ab c70003000000    mov     dword ptr [eax],0x3 ds:00000000=???????? 007d75b1 894808          mov     [eax+0x8],ecx ds:0130ea06=???????? 007d75b4 c20400          ret     0x4 007d75b7 cc              int     3 007d75b8 cc              int     3 007d75b9 cc              int     3 007d75ba cc              int     3 007d75bb cc              int     3 007d75bc cc              int     3 007d75bd cc              int     3 007d75be cc              int     3 007d75bf cc              int     3

*> Stack Back Trace <*

FramePtr ReturnAd Param#1 Param#2  Param#3  Param#4  Function Name 000000ff 00000000 00000000 00000000 00000000 00000000 ibmx25!os_wtime (FPO: [1,0,0]) 000000ff 00000000 00000000 00000000 00000000 00000000 snalink!



CAUSE
The Event 320 error indicates that the device driver is unable to transmit a frame for the X.25 link service because its transmission buffers are full. The access violation occurs when the link service tries to recover after this error.



STATUS
Microsoft has confirmed this to be a problem in SNA Server versions 3.0, 3.0 Service Pack 1 (SP1), and 3.0 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: snalink x.25

Keywords: kbbug kbfix kbqfe kbhotfixserver KB176188

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