ORA-07445: Exception Encountered: Core Dump [skgxplookupasno()+68]
Last updated on NOVEMBER 28, 2016
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 to 184.108.40.206 [Release 11.2]
Information in this document applies to any platform.
ORA-07445: exception encountered: core dump [skgxplookupasno()+68] [SIGSEGV] [ADDR:0x484] [PC:0xFFFFFFFF7D4ADDF0] [Address not mapped to object] 
You find one or all of the following function codes in the 'Call Stack' section of the trace files:
skgxplookupasno skgxpdocon skgxpiwait skgxpwaiti skgxpwait
This can be triggered by an instance restart or a change to a node in a RAC environment. HOWEVER, other triggers are possible.
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