Job failed with error tempdb is not available

HI All,

Backup job failed with error 'Unable to determine if the owner () of job backup_all_user_db_full has server access (reason: The log for database 'tempdb' is not available. [SQLSTATE HY000] (Error 9001)).'

I checked in errorlog

LogWriter: Operating system error 1784(The supplied user buffer is not valid for the requested operation.) encountered.                                                            Write error during log flush. Shutting down server
2014-09-09 07:46:25.90 spid52    Error: 9001, Severity: 21, State: 1
2014-09-09 07:46:25.90 spid52    The log for database 'tempdb' is not available..
2014-09-09 07:46:25.92 spid51    Error: 9001, Severity: 21, State: 1

Can anyone suggest to why it is happening