ORA-7445 dump in Kcbw_init_datachunk and Kcbs_dump_adv_state (Doc ID 2163445.1)

Last updated on JUNE 06, 2019

Applies to:

Symptoms

Instance crash with MMAN dumping with the below 2 errors:

ORA-07445: exception encountered: core dump [kcbs_dump_adv_state()+944] [SIGSEGV] [ADDR:0xAEFFFFFFEC] [PC:0x1065A2390] [Address not mapped to object] []
ORA-07445: exception encountered: core dump [kcbw_init_datachunk()+1124] [SIGSEGV] [ADDR:0xB38F000001C3

After this the startup is ok.

Call stack similar to:

kcbw_resize_init_granule <- kcbw_consume_granule <- kmgs_process_request_deferred
<- kmgs_process_reques <- kmgsdrv <- ksbcti <- ksbabs <- ksbrdp
<- opirip <- opidrv <- sou2o <- opimai_real <- ssthrdmain
<- main

Incident trace file contains information on the auto-tuned SGA pool sizes and pre-defined pool sizes in the section:

 --------- GC Source: [Non_Default_Kernel_Parameters] --------

Eg:

[0004]: __shared_pool_size=3221225472  ---------------> auto-tuned ~ 3GB
[0004]: __large_pool_size=33554432--------------------> auto-tuned
[0004]: __java_pool_size=33554432---------------------> auto-tuned
[0004]: __streams_pool_size=33554432-----------------> auto-tuned
[0004]: __sga_target=9797894144----------------------> auto-tuned
[0004]: __db_cache_size=5301600256------------------> auto-tuned ~ 6GB

[0004]: shared_pool_size=0-------------------------------> predefined = 0MB
[0004]: memory_target=15032385536-------------------> predefined
[0004]: memory_max_target=15032385536--------------> predefined
[0004]: db_cache_size=637534208----------------------->predefined ~ 600MB

...

Cause

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