Errors while Changing the Database to Mutli User Mode from Single user mode in SQL Server 2012

Question

Hi,
Good Afternoon :).  Need your help in resolving one of the issue with SQL Server 2012.
Today, we kept one of the database in the Single User mode and wanted to bring back to Multi User mode.  But we are getting the below error.  There are no user sessions connected to this database which are blocking each other.  I see multiple
SYSTEM sessions are in blocked state.  The blocking is not cleared even affter restarting the SQL services.
Verified the SQL Server Errorlog and couldnt get much useful information to troubleshoot the issue.
pasted the information from the sys.sysprocesses as well for your kind reference.
Msg 1205, Level 13, State 68, Line 1
Transaction (Process ID 55) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
Msg 5069, Level 16, State 1, Line 1
ALTER DATABASE statement failed.
spid
kpid
blocked
waittype
waittime
dbid
login_time
status
cmd
18
1004
36
0x0005
144
5
4/9/2014 13:13
background                    
TASK MANAGER    
35
1796
36
0x0005
35
5
4/9/2014 13:34
background                    
TASK MANAGER    
36
2464
37
0x0005
363
5
4/9/2014 13:34
background                    
TASK MANAGER    
37
5100
36
0x0005
254
5
4/9/2014 13:04
background                    
TASK MANAGER    

Answer 1

Clearly 36 and 37 are causing deadlock.
see
https://www.simple-talk.com/sql/database-administration/handling-deadlocks-in-sql-server/
http://www.mssqltips.com/sqlservertip/1036/finding-and-troubleshooting-sql-server-deadlocks/
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