Reportservertempdb locking Bug

Hello,

WritelockSession store procedure is blocking the GetSessionData StoreProc for over 45 sec in Report server Database.
When i further investigate I found , there is some Locking in dbo.SessionLock in ReportserverTempdb Databse.
Is this something to do with session timeout of report.

This is very frequently occuring scenerio.
Is this a bug...


Thanks,
Sandeep