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Select from x$ksmmem View Fails with ORA-07445 [qerfxGCol] Errors after Upgrading to 12c (Doc ID 2161005.1)

Last updated on FEBRUARY 15, 2019

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.


The alert log and the incident trace file report the following error:

ORA-07445: exception encountered: core dump [qerfxGCol()+2184] [SIGSEGV] [ADDR:0x7000000003D0900] [PC:0x105F51508] [Address not mapped to object]

The current sql in the trace file shows a simple Query involving x$ksmmem:

select * from x$ksmmem

The failing functions and the call stack in the trace file shows functions like:

... qerfxGCol  qerfxFetch  opifch2  kpoal8  opiodr  ttcpip  opitsk  opiino  opiodr  opidrv  sou2o  opimai_real  ssthrdmain  main  start ..... 


The database has been upgraded to 12c


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