ILS: ILS Service Crashes on Multi-processor Servers

• Microsoft Site Server version 2.0
• Microsoft Internet Locator Server
• Microsoft Commercial Internet System version 1.0

SYMPTOMS

If a multiprocesor computer is under load, Internet Locator Server (ILS) may randomly experience access violations.

CAUSE

The ILS database may be corrupted due to a data pointer being freed without the corresponding database entry being deleted. As a result, another thread finds the entry in the database, and tries to access the data which causes an access violation to occur.

Another problem was found when adding a user if the user already existed in the database, and certain conditions were met to re-add the user (that is, the correct password was passed in). The server reuses the same base user record. The problem occurs because data pointers are reallocated without first checking to see if the record is currently being used by another thread. As a result, the thread currently accessing the entry experiences an access violation when it attempt to read memory that has already been freed.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Site Server version 2.0.

This problem has been corrected in the latest U.S. Service Pack for Microsoft Site Server version 2.0. 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: prodmcis

Keywords          : 
Version           : WinNT:1.0,2.0
Platform          : winnt 
Issue type        : kbbug 

Last Reviewed: July 20, 1999