We had this problem last night on a linux server running red hat with DB2 v7.2 with db2level output below as well:
[db2inst1@tofrdw03 db2inst1]$ db2level
DB21085I Instance "db2inst1" uses DB2 code release "SQL07025" with level
identifier "03060105" and informational tokens "DB2 v7.1.0.68", "s020616" and
"U484487".
Starting a full database backup.
2003-11-25-04.32.14.126036 Instance:db2inst1 Node:000
PID:1690(db2agent (DAY2PROD)) Appid:*LOCAL.db2inst1.031125093214
database_utilities buildAppTblsp Probe:20 Database

AY2PROD
DiagData
00f8 ffff 0a00 0000 0600 0000 .øÿÿ........
2003-11-25-04.32.14.223052 Instance:db2inst1 Node:000
PID:1690(db2agent (DAY2PROD)) Appid:*LOCAL.db2inst1.031125093214
database_utilities buildAppTblsp Probe:20 Database

AY2PROD
00f8 ffff 0a00 0000 0600 0000 .øÿÿ........
2003-11-25-04.32.14.411932 Instance:db2inst1 Node:000
PID:1690(db2agent (DAY2PROD)) Appid:*LOCAL.db2inst1.031125093214
database_utilities sqlubcka Probe:0 Database

AY2PROD
Backup terminated.
If anyone has any ideas that would be appreciated
thanks
Mark