Dblink to Dameng from Oracle got error: [unixODBC][Driver Manager]Can't open lib '/opt/dmdbms/bin/libdodbc.so' : file not found {01000} - oracle

Question

I tried to use a dblink I created in Oracle to access a Dameng database and this error poped up. I tried to isql to Dameng database before, and I could connect to Dameng with isql.
Here is my /etc/odbc.ini:
[dm8]
Driver = DM8 ODBC DRIVER
Description = DM ODBC DSND
SERVER = 10.10.10.73
UID = SYSDBA
PWD = SYSDBA
TCP_PORT = 5236
Here is my /etc/odbcinst.ini file:
[DM8 ODBC DRIVER]
Description = ODBC DRIVER FOR DM8
Driver = /opt/dmdbms/bin/libdodbc.so
threading = 0
I was able to connect to Dameng database via isql successfully.
But when after I set up related Oracle configurations, and connect from Oracle, the error poped up.
Here are some related configurations:
ORACLE_HOME/hs/admin/initdm8.ora:
HS_FDS_CONNECT_INFO = dm8
HS_FDS_TRACE_LEVEL = debug
HS_FDS_SHAREABLE_NAME = /usr/lib64/libodbc.so
#HS_FDS_SHAREABLE_NAME = /usr/lib/libodbc.so
HS_FDS_SUPPORT_STATISTICS=FALSE
#HS_LANGUAGE="SIMPLIFIED CHINESE_CHINA.ZHS16GBK"
HS_LANGUAGE="AMERICAN_AMERICA.ZHS16GBK"
HS_NLS_NCHAR=UCS2
For ORACLE_HOME/network/admin/listener.ora, I added SID_DESC in existing SID_LIST:
(SID_DESC =
(PROGRAM = dg4odbc)
(ORACLE_HOME = /u01/app/oracle/product/19.0.3/dbhome_1)
(SID_NAME = dm8)
(ENVS="LD_LIBRARY_PATH=/u01/app/oracle/product/19.0.3/dbhome_1/lib:/opt/dmdbms/bin")
)
For ORACLE_HOME/network/admin/tnsnames.ora, added:
dm8 =
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP) (HOST=ylzcs) (PORT=1521)
)
(CONNECT_DATA=
(SID=dm8)
)
(HS=OK)
)
The dblink was created and used in PL/SQL:
drop database link dblink_DM8;
create database link dblink_DM8 connect to "SYSDBA" identified by "SYSDBA" using 'dm8';
select * from v$version#dblink_DM8;
I have searched lots of web pages and encountered many assumptions, but they usually do not match my situation:
Assumption: this libdodbc.so file doesn't exist. Answer: the file does exists at that location.
Assumption: Oracle's install user doesn't have access to this file. Answer: the install user oracle was used to install Dameng database, which is the same user used to install Oracle, so libdodbc.so belongs to oracle.
Assumption: You didn't set up LD_LIBRARY_PATH environment variable. Answer: I did set it up in .bash/profile, and the content of LD_LIBRARY_PATH is :/opt/dmdbms/bin:/opt/dmdbms/bin
Assumption: libdodbc.so has some dependent files missing. Answer: there are no not found entries:
[root#ylzcs log]# ldd /opt/dmdbms/bin/libdodbc.so
linux-vdso.so.1 => (0x00007ffd317fd000)
libdmdpi.so => /opt/dmdbms/bin/libdmdpi.so (0x00007f5852901000)
libdmfldr.so => /opt/dmdbms/bin/libdmfldr.so (0x00007f5851ca1000)
libdmelog.so => /opt/dmdbms/bin/libdmelog.so (0x00007f5851a99000)
libdmutl.so => /opt/dmdbms/bin/libdmutl.so (0x00007f5851884000)
libdmclientlex.so => /opt/dmdbms/bin/libdmclientlex.so (0x00007f585164f000)
libdmos.so => /opt/dmdbms/bin/libdmos.so (0x00007f5851420000)
libdmcvt.so => /opt/dmdbms/bin/libdmcvt.so (0x00007f5850d3f000)
libdmstrt.so => /opt/dmdbms/bin/libdmstrt.so (0x00007f5850b29000)
librt.so.1 => /lib64/librt.so.1 (0x00007f5850915000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f58506f9000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f58504f4000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f58501ed000)
libm.so.6 => /lib64/libm.so.6 (0x00007f584feeb000)
libc.so.6 => /lib64/libc.so.6 (0x00007f584fb1d000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f584f907000)
libdmmem.so => /opt/dmdbms/bin/libdmmem.so (0x00007f584f6f5000)
libdmcalc.so => /opt/dmdbms/bin/libdmcalc.so (0x00007f584f474000)
/lib64/ld-linux-x86-64.so.2 (0x0000562c35c01000)
Assumption: libdodbc.so is not compatible with the system. Answer: both the driver and the system are x86_64.
Could there be any other reasons? Any help would be greatly appreciated!