error: ora-07445 when execute "show parameter shared" or "select * from v$parameter where name='SHAR

 hi all,

     I got a ora-03113 when I excute :show parameter shared ,and I found a ora-07445 in alert log.

here is the details:

SQL> show parameter shared
ORA-03113: end-of-file on communication channel

ORA-07445: exception encountered: core dump [__GI_strlen()+32] [SIGSEGV] [Addres
s not mapped to object] [0x000000182] [] []

But,when I excute show parameter,or select * from v$parameter,I can get the result without any error..

my oracle version is 10.2.0.2.0 ,OS is SUSE LINUX Enterprise Server 9 (x86_64).

please help me.

thanks.