ran accross the ORA-00600: internal error code, arguments: error

got the following error from alert log
Tue Oct 14 01:21:43 2008
Errors in file /opt/app/oracle/admin/RPTS/bdump/rpts2_mmon_7106.trc:
ORA-00600: internal error code, arguments: [ktte_append_file_info-1], [11], [11], [11], [11], [], [], []
Tue Oct 14 01:21:45 2008
Trace dumping is performing id=[cdmp_20081014012145]
Tue Oct 14 01:26:59 2008
Restarting dead background process MMON
MMON started with pid=98, OS id=10278
Tue Oct 14 01:27:03 2008
Errors in file /opt/app/oracle/admin/RPTS/bdump/rpts2_mmon_10278.trc:
ORA-00600: internal error code, arguments: [ktte_append_file_info-1], [11], [11], [11], [11], [], [], []
Tue Oct 14 01:27:06 2008
Trace dumping is performing id=[cdmp_20081014012706]
.
view the filesystem with df command.
I find there are two filesystem lost.
on the node 2
qfs1                 10463232 6603904 3859328    64%    /oraredo1
qfs2                 10463232 7667456 2795776    74%    /oraredo2
qfs3                 10463232 4521344 5941888    44%    /oraredo3
qfs4                 209686528 168134676 41551852    81%    /oradata1
qfs5                 209686528 183883244 25803284    88%    /oradata2
qfs6                 209686528 176236448 33450080    85%    /oradata3
qfs7                 209686528 177217520 32469008    85%    /oradata4
qfs8                 1073709056 611645372 462063684    57%    /orabackup
qfs9                 209686528 91208760 118477768    44%    /oraarchive
qfs10                1026048  309892  716156    31%    /cluster_files.
on the node 1.
qfs1                 10463232 6603904 3859328    64%    /oraredo1
qfs2                 10463232 7667456 2795776    74%    /oraredo2
qfs3                 10463232 4521344 5941888    44%    /oraredo3
qfs4                 209686528 168134676 41551852    81%    /oradata1
qfs9                 209686528 90046456 119640072    43%    /oraarchive
qfs8                 1073709056 591258688 482450368    56%    /orabackup
qfs7                 209686528 177217520 32469008    85%    /oradata4
qfs6                 209686528 176236448 33450080    85%    /oradata3
qfs10                1026048  309892  716156    31%    /cluster_files
qfs5                 209686528 183883244 25803284    88%    /oradata2
/dev/md/dsk/d97      1021735    4636  955795     1%    /global/.devices/node@3
qfs11                209686528 4198500 205488028     3%    /oradata5
qfs12                209686528 101256816 108429712    49%    /orabackup2
/dev/md/dsk/d95      1021735    3880  956551     1%    /global/.devices/node@2