How to resolve ORA-48128 during export

Applicable to Oracle 19.3 and onwards.

The following error may occur when you export data using Data Pump

Parameter file:

userid=system/mypasswd
directory=DATA_PUMP_DIR
logfile=exp_sales.log
dumpfile=klm.dmp
exclude=statistics
job_name=exp_klm
schemas=KLM
flashback_time=systimestamp

Execute the export:

expdp parfile=expdp.par

Result:

RA-39126: Worker unexpected fatal error in KUPW$WORKER.CREATE_OBJECT_ROWS [USER]
USER:"GRDA_TEST"
ORA-39155: error expanding dump file name "/data1/export/klm.dmp"
ORA-48128: opening of a symbolic link is disallowed

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 105
ORA-06512: at "SYS.KUPW$WORKER", line 12630
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 105
ORA-06512: at "SYS.KUPF$FILE", line 9793
ORA-06512: at "SYS.KUPF$FILE_INT", line 1211
ORA-06512: at "SYS.KUPF$FILE", line 9734
ORA-06512: at "SYS.KUPW$WORKER", line 11341

----- PL/SQL Call Stack -----
  object      line  object
  handle    number  name
0xcf98d208     33543  package body SYS.KUPW$WORKER.WRITE_ERROR_INFORMATION
0xcf98d208     12651  package body SYS.KUPW$WORKER.DETERMINE_FATAL_ERROR
0xcf98d208     11612  package body SYS.KUPW$WORKER.CREATE_OBJECT_ROWS
0xcf98d208     15278  package body SYS.KUPW$WORKER.FETCH_XML_OBJECTS
0xcf98d208      3917  package body SYS.KUPW$WORKER.UNLOAD_METADATA
0xcf98d208     13746  package body SYS.KUPW$WORKER.DISPATCH_WORK_ITEMS
0xcf98d208      2439  package body SYS.KUPW$WORKER.MAIN
0xcf996200         2  anonymous block

KUPW: Object row index into parse items is: 1
KUPW: Parse item count is: 4
KUPW: In function CHECK_FOR_REMAP_NETWORK
KUPW: Nothing to remap
KUPW: In procedure BUILD_OBJECT_STRINGS - non-base info
KUPW: In procedure BUILD_SUBNAME_LIST with USER:KLM.KLM
KUPW: In function NEXT_PO_NUMBER
KUPW: PO number assigned: 13
KUPF$FILE.WRITE_LOB
KUPW: In procedure DETERMINE_FATAL_ERROR with ORA-39155: error expanding dump file name "/data1/export/klm.dmp"
ORA-06512: at "SYS.KUPF$FILE", line 9793
ORA-48128: opening of a symbolic link is disallowed
ORA-06512: at "SYS.KUPF$FILE_INT", line 1211
ORA-06512: at "SYS.KUPF$FILE", line 9734

Job "SYSTEM"."EXP_KLM" stopped due to fatal error at Wed Sep 22 08:42:49 2021 elapsed 0 00:00:04

Reason: bug

Solution:
Outlined in Doc ID 2654167.1 "Customer RecommendedDataPump Export (EXPDP) Fails Due to ORA-39155 ORA-48128":

ALTER SYSTEM  SET "_disable_directory_link_check" =true  SCOPE=SPFILE;
shutdown immediate
startup