ORA-07445: exception encountered

What is the significance of the error ORA-7445?

[oracle@dbtest ~]$ oerr ora 7445
07445, 00000, "exception encountered: core dump [%s] [%s] [%s] [%s] [%s] [%s]"
// *Cause: An OS exception occurred which should result in the creation of a core file.  This is an internal error.
// *Action: Contact your customer support representative.

An ORA-7445 error is raised by an Oracle server process when it has received a fatal signal from the operating system.

ORA-7445 errors are likely caused by OS problems rather than an Oracle problem.

An ORA-7445 is a generic error, and can occur anywhere in the Oracle code.  

Before contacting the customer support, Read the following MOS notes to understand better on the error ORA-7445

Customer Introduction to ORA-7445 Errors (Doc ID 211909.1)

ORA-7445 [kgghash] (Doc ID 310172.1)

ORA-600/ORA-7445/ORA-700 Error Look-up Tool (Doc ID 153788.1)