How to troubleshoot “SQL Server is terminating because of fatal exception c06d007e”

Case 1, with Dump generated Issue definition: ======== Customer have SQL 2008/2012/2014 running on the same server, and then applied the SP4 for SQL Server 2012 in Windows update. But after this customer saw some issue from application side, then you rollback the update. And then Customer applied the SP3 for SQL Server 2012, but after that the SQL Server service can’t startup with following message and dump generated. Customer also tried to repair SQL Server many times, it doesn’t work. 2018-02-22 18:31:43.52 Server      Error: 17311, Severity: 16, State: 1. 2018-02-22 18:31:43.52 Server      SQL Server is terminating because of fatal