DB2 FOR LUW / DB2FORLUW / A50 - DB2

When queries are executed with a high degree of parallelism
while accessing column based tables, a rare timing hole may
result in memory corruption, causing DB2 to abend.

While the trapping function stack may vary, the most common
function stack observed is :
diagnoseMemoryCorruptionAndCrash__13SQLO_MEM_POOLFUlCPCcCb
sqloDiagnoseFreeBlockFailure__FP8SMemFBlkCb
sqlofmblkEx
freeMem__Q3_7ibm_cde8services4HeapFCPCcCUlPv
freeHeap__Q3_7ibm_cde8services15ManagedHeapBaseFv
__dt__Q3_7ibm_cde8services15ManagedHeapBaseFv
__dt__Q3_7ibm_cde8services11ManagedHeapXTUcSP0_Fv
__dt__Q3_7ibm_cde5query14QueryResourcesFv
__dt__Q3_7ibm_cde5query9SchedulerFv
cleanAndDeleteScheduler__Q3_7ibm_cde5query9SchedulerFPQ3_7ibm_cd
e5query9Scheduler

****************************************************************
* USERS AFFECTED:                                              *
* Systems processing columnar data.                            *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Issue is addressed in APAR IT26816 in version 11.1.          *
* Upgrade to Version 11.1 Mod 3 Fix Pack 3 or higher           *
****************************************************************

reducing the maximum or default degree of parallelism will tend
to avoid the problem, eg. to 4

not known / see Local fix

forerunner  : IT23941 
follow-up : 

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

31.10.2018
04.06.2019
04.06.2019