SQL> alter table INFRA.TBL_XXX drop partition PART_25;
ERROR at line 1:
ORA-00600: internal error code, arguments: [kcfrbd_3], , , , , , , 
If the datafile with number 239 belong to the active UNDO tablespace, then try to reduce the size of this datafile. And then increase to its original size if you like. If you can not reduce the size of this datafile; then create a new UNDO tablespace, switch to this new UNDO tbalespace and then drop the old one.
This should fix the problem.
If not; as a workaround you can first move and then drop the partition.