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Sessions Intermittently Crash with ORA-7445[ksmem_free()+50] in the Alert Log (Doc ID 2411612.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

In a shared server environment, sessions intermittently crash with ORA-7445[ksmem_free()+50] errors in the alert log:

ORA-07445: exception encountered: core dump [ksmem_free()+50] [SIGSEGV] [ADDR:0x7F80422C1FF8] [PC:0xC617C02] [Address not mapped to object] []

 

The Call Stack Trace in the associated incident trace file shows:

ksmem_free <- ssMemFree <- naetrm <- naectrm <- nadisc <- nsnadisc <- nsclose <- nsdisc <- kmddsl <- kmderr <- kmd_recv_buf <- kmdu2s <- kmdmai <- kmmrdp <- opirip

 

Cause

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