Extended event status change

Hi 

Please see my Extended event script to capture the deadlock details

CREATE EVENT SESSION [Monito_DeadLock]
ON SERVER
ADD EVENT sqlserver.lock_deadlock
(
     ACTION 
     (
                                sqlserver.client_app_name, 
                                sqlserver.client_hostname, 
                                sqlserver.database_id, 
                                sqlserver.nt_username, 
                                sqlserver.plan_handle, 
                                sqlserver.session_id, 
                                sqlserver.session_nt_username, 
                                sqlserver.sql_text, 
                                sqlserver.tsql_stack
                )
)
ADD TARGET package0.asynchronous_file_target
(
     SET filename='c:\DeadLock\lk.xet', max_file_size=25, 
     max_rollover_files=25, metadatafile='c:\DeadLock\lk.xem'
)

Script creates the event session successfully, but the following script runs for ever , Its showing wait type as XE_SERVICES_MUTEX. 

alter event session [Monitor_DeadLock] on server state=start

After restarting the SSMS when I checked the status, its showing as Running?. If I try to stop the session 

alter event session [Monitor_DeadLock] on server state=stop

same thing happens. But the ALTER command get blocked by another session. Blocked by session showing XE_SERVICES_MUTEX  wait and command its executing  "alter event session [Monitor_DeadLock] on server state=start "

blocked session showing wait as LCK_M_SCH_M  

What is wrong..?

Server details

SQL Server 2008 r2 Sp2 64 bit

vt

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