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MMON Slave Process Reports ORA-7445 [kglic0]/[kksIterCursorStat] Error, Plus Database Hangs (Doc ID 1487720.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Information in this document applies to any platform.


When the MMON_SLAVE is attempting to perform an "Auto-Flush Slave Action", one of the following errors may occur:

ORA-07445: exception encountered: core dump [kglic0()+1075] [SIGSEGV] [ADDR:0x18] [PC:0x90F1CFF] [Address not mapped to object] []

- OR -

ORA-07445: exception encountered: core dump [kksIterCursorStat()+596] [SIGSEGV] [ADDR:0x17] [PC:0x5562FEC] [Address not mapped to object] []

Subsequently, the following message can be reported in the Alert log:

PMON failed to acquire latch...

The Call Stack in the MMON_SLAVE trace file at the time of the error shows the following Oracle functions:

... kksIterCursorStat kewrrtsq_rank_topsql kewrbtsq_build_topsql kewrftsq_flush_topsql kewrft_flush_table kewrftec_flush_table_ehdlcx kewrfat_flush_all_tables kewrfos_flush_onesnap kewrfsc_flush_snapshot_c kewrafs_auto_flush_slave...

In the case of the ORA-7445 [kglic0] error, the "kksIterCursorStat" function is preceded by the "kglic0" function in the Call Stack:

... kglic0 kksIterCursorStat kewrrtsq_rank_topsql kewrbtsq_build_topsql kewrftsq_flush_topsql ...

During this time, a database hang may be experienced.





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