Query Via DBLINK Fails With Ora-07445: Exception Encountered: Core Dump [Qkaqkn()+4744] [Sigsegv]
(Doc ID 1130973.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124.0 and later
Information in this document applies to any platform.
*** Checked for relevance 29-Sept-2012 ****
After upgrading from 11.1 to 11.2 a query which used to run successfully via dblink to another instance now fails with:
ORA-07445: exception encountered: core dump [qkaqkn()+4744] [SIGSEGV] [ADDR:0x20] [PC:0x1600076] [Address not mapped to object] 
The remote instance shows no errors.
The stack contains some or all of the following functions:
qkaqkn <- qkadrv <- qkadrv <- opitca <- kksFullTypeCheck <- rpiswu2 <- kksLoadChild <- kxsGetRuntimeLock <- kksfbc <- kkspsc0 <= kksParseCusor <- opiosq0 <- kpooprx <- kpoal8 <- opiodr
From the trace of the failed process the process state has the information:
last wait for 'SQL*Net message from dblink'
Upgraded from 126.96.36.199 to 188.8.131.52
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