Set LOCK_TIMEOUT

SET LOCK_TIMEOUT 1000 when APPLY sys.dm_exec_query_statistics_xml to prevent mutex issues.  Set GitHub BrentOzarULTD#3210

Author: sqlslinger

sp_BlitzFirst.sql

@@ -2293,8 +2293,9 @@ If one of them is a lead blocker, consider killing that query.'' AS HowToStopit,
 				  CROSS APPLY sys.dm_exec_query_plan(r.plan_handle) AS qp ';
 
 				IF EXISTS (SELECT * FROM sys.all_objects WHERE name = 'dm_exec_query_statistics_xml')
-					SET @StringToExecute = @StringToExecute + N' OUTER APPLY sys.dm_exec_query_statistics_xml(s.session_id) qs_live ';
-				  
+				/* GitHub #3210 */
+					SET @StringToExecute = N'
+                   SET LOCK_TIMEOUT 1000 ' + @StringToExecute + N' OUTER APPLY sys.dm_exec_query_statistics_xml(s.session_id) qs_live ';
 
 				SET @StringToExecute = @StringToExecute + N';