While upgrading from 19.11 to 19.12, you may encounter an ORA-7445 [__intel_ssse3_rep_memcpy()+10816] [SIGSEGV] error.
This is likely to occur during or after DB startup but before “datapatch -verbose”, if there are RMAN RESTORE jobs running in the environment being patched.
Oracle recommends that you apply interim “one-off Patch 33144001” to prevent this problem in the below RU/RURs:
DB RU 19.12.0.0.210720
DB RUR 19.11.1.0.210720