ORACLE instance started.
Total System Global Area 100663296 bytes
Fixed Size 1217884 bytes
Variable Size 88083108 bytes
Database Buffers 8388608 bytes
Redo Buffers 2973696 bytes
ORA-01102: cannot mount database in EXCLUSIVE mode
Are you by chance using Data Guard or a physical standby database?
In any case, Oracle Metalink Note 1034037.6 may be of assistance if you have access to Oracle Support and Metalink.
I would try to shutdown the instance cleanly and check that no background processes owned by oracle are running. Then I would check for current open semaphores are running that are owned by oracle.
You can use ipcs and ipcrm to do this. Then try to startup the instance again.
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