A good advice from Alejandro...
The last weeks I was involved on installing Patch 10.2.0.3 on 4 RAC environments.
Two of them were 32 bits and the other two, 64 bits.
On 32 bits the patch install went fine, on 64 bits after installing rpm Binutils the install worked fine also.
3 out of 4 environments started to work without problem after patch set 10.2.0.3.
But one of them started to suffer from ORA-00600: internal error code, arguments: [kcbz_check_objd_typ_3], , , , , , ,  that triggered instance crashes with error 447.
Check it out...