Microsoft KB Archive/138792

= TCARC.SYS Causes Trap 0xA or Hangs Windows NT =

Article ID: 138792

Article Last Modified on 10/31/2006

-

APPLIES TO


 * Microsoft Windows NT Server 3.51

-



This article was previously published under Q138792



SYMPTOMS
On symmetric multiprocessor (SMP) configurations using the Thomas Conrad Arcnet driver included with Windows NT a STOP message appears with a Trap 0x0000000A, or your system appears to hang. The following is a stack trace for one of the processors:

ChildEBP RetAddr Args to Child

fe36fef4 fbd703a8 00000000 fe4e11e8 00000001 NT!_KiTrap0E+0x25a

fe36ff90 fbd5101c fe4e11e8 fe4cf3dc fe58cfe3

NDIS!_ArcFilterDprIndicateReceive+0x253

fe36ffac fbd50d59 fbd50cd6 fe4cd024 fe4d34f8

tcarc!TcarcDpcProcessEnqueuedReceive+0x2e

fe36ffc0 fbd60805 fe4cd000 fe561420 fe561468 tcarc!_TcarcDpc+0x83

fe36ffd8 8013906a fe4cd038 fe4cd024 00000000 NDIS!_NdisMDpc+0x39



CAUSE
Both processors have code paths that try to modify the list of received packets at the same time causing the list to get corrupted.

The TCARC.SYS driver contains a list of received packets that is modified by the TcarcEnqueueReceives routine. When a packet is received in an SMP computer, the TcarcEnqueueReceives routine gets called by the TcarcIsr routine on one processor and the TcarcDpc routine on a second processor at the same time.

If the list corruption results in a non-NULL-terminated list the server does not trap but appears to hang. However, technically the server is not hung but is caught in a loop because the TcarcDpc routine continues to indicate packets in the corrupted, non-NULL-terminated, received-packets list because it never encounters a NULL.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51. This problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For information on obtaining the 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: prodnt blue screen crash wedges wedge tight loop

Keywords: kbprint KB138792

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.