ORA-00600 ktfbhget:objdchk_kcbgcur_3 when trying to plug PDB back to 12.1.0.2

Those days, when trying to connect a 19c PDB back to a 12.1.0.2 CDB, I was receiving a strange ORA-00600 error:

SQL> alter pluggable database PDB12C open;
alter pluggable database PDB12C open
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [ktfbhget:objdchk_kcbgcur_3], [4294967295], [13], [0], [0], [0], [], [], [], [], [], []

In my environment, the only difference is that I was moving from a Local Undo model back to Shared Undo (in 12.1.0.2, the Local Undo was yet not available).

After researching a bit, I found this bug 21388707 (LNX64-12C-UD:ENABLE LOCAL UNDO, PLUG 12.1 NONCDB INTO 12.2CDB FAILED).

Once I had it applied, I could plug and open my PDB without any issues.

If you plan to fallback from 19c, I recommend reading this MOS note that will show all the patches that are required: Oracle 19c - How to Downgrade a 19c Multitenent Database (CDB) or Non CDB Database to Previous Release (Doc ID 2548962.1)

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