ORA-00600, ORA-07445 and ORA-00020 errors and related bugs in 12c (12.2.0.1)

(Satishbabu Gunukula) I have come across below error recently in 12c (12.2.0.1). It first started with ORA-00600 followed by ORA-07445 and ORA-00020. The ORA-00600, ORA-07445 looks like real culprit and which lead to ORA-00020 error.

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