Segmentation fault

Linux and Unix-Like Linux
1

Hi,
on a linux Red HAT(with Oracle DB 9.2.0.7) I have following error :

RMAN> delete obsolete;

RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 2
using channel ORA_DISK_1
Segmentation fault
What does it mean ? And the solution ?
Many thanks.