I got an error during an TXK patch in a 12.2 EBS instance.
This happened while executing file xdotmgen.ldt.
Error: FAILED: file xdotmgen.ldt on worker 1 for product fnd username APPS.
Uploading from the data file
Uploading from staging tables Error during uploading. ORA-00600: internal error code, arguments: , [0x13C88677A0], , , , , , , , , , 
After looking at MOS Note Id 1953472.1, it turns out to be due to a couple of invalid objects in the database.
The solution worked and were able to continue with the ADOP cycle.
ALTER PACKAGE APPS.FND_EXECUTABLES_PKG COMPILE BODY;
ALTER PACKAGE APPS.FND_SEED_STAGE_UTIL COMPILE BODY;