After applying the fix provided in the Knowledge Base article 2515286 on your SQL server, if you run a XQuery, you will notice the query encounters errors and the following messages are reported in the SQL Server Error log:
2011-05-30 07:31:36.60 spid76 Using 'dbghelp.dll' version '4.0.5'
2011-05-30 07:31:36.64 spid76 ***Stack Dump being sent to C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG\SQLDump0006.txt
2011-05-30 07:31:36.64 spid76 SqlDumpExceptionHandler: Process 76 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.
2011-05-30 07:31:36.64 spid76 * *******************************************************************************
2011-05-30 07:31:36.64 spid76 *
2011-05-30 07:31:36.64 spid76 * BEGIN STACK DUMP:
2011-05-30 07:31:36.64 spid76 * 05/30/11 07:31:36 spid 76
2011-05-30 07:31:36.64 spid76 *
2011-05-30 07:31:36.64 spid76 *
2011-05-30 07:31:36.64 spid76 * Exception Address = 01003CA2 Module(sqlservr+00003CA2)
2011-05-30 07:31:36.64 spid76 * Exception Code = c0000005 EXCEPTION_ACCESS_VIOLATION
2011-05-30 07:31:36.64 spid76 * Access Violation occurred writing address 010201A0
2011-05-30 07:31:39.10 Server Error: 17310, Severity: 20, State: 1.
2011-05-30 07:31:39.10 Server A user request from the session with SPID 76 generated a fatal exception. SQL Server is terminating this session. Contact Product Support Services with the dump produced in the log directory.
2011-05-30 07:31:36.60 spid76 Using 'dbghelp.dll' version '4.0.5'
2011-05-30 07:31:36.64 spid76 ***Stack Dump being sent to C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG\SQLDump0006.txt
2011-05-30 07:31:36.64 spid76 SqlDumpExceptionHandler: Process 76 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.
2011-05-30 07:31:36.64 spid76 * *******************************************************************************
2011-05-30 07:31:36.64 spid76 *
2011-05-30 07:31:36.64 spid76 * BEGIN STACK DUMP:
2011-05-30 07:31:36.64 spid76 * 05/30/11 07:31:36 spid 76
2011-05-30 07:31:36.64 spid76 *
2011-05-30 07:31:36.64 spid76 *
2011-05-30 07:31:36.64 spid76 * Exception Address = 01003CA2 Module(sqlservr+00003CA2)
2011-05-30 07:31:36.64 spid76 * Exception Code = c0000005 EXCEPTION_ACCESS_VIOLATION
2011-05-30 07:31:36.64 spid76 * Access Violation occurred writing address 010201A0
2011-05-30 07:31:39.10 Server Error: 17310, Severity: 20, State: 1.
2011-05-30 07:31:39.10 Server A user request from the session with SPID 76 generated a fatal exception. SQL Server is terminating this session. Contact Product Support Services with the dump produced in the log directory.