If you are running into a ORA-07445 or ORA-00600 error something you should fix immediately happened on your Database. You should do following things before opening a TAR on Metalink:

• get the exact error-message including the things in the square brackets from the alert-log
• logon to metalink and search for the document 153788.1 that's the Error-Lookup-Tool from Oracle for these errors and open that document
• choose if it is a ORA-00600 or a ORA-07445 and enter the things in the first square brackets into the field "Error Code First Argument" and press "Lookup Error"

If you are lucky and find informations/patches (what pretty often happens -> good stuff Oracle) you can probably fix it by yourself. If not you have to open a Metalink-TAR.