A fix is available
APAR status
Closed as program error.
Error description
The QTXA section is used in both IFCID2 and IFCID3. PI93817 added a number of fields to the QTXA section. However, they are only populated for IFCID2. These newly added fields should be ignored in IFCID 3 and should all be zero. However, in some cases the QTXA section in IFCID3 is not initialized properly before usage, making that it is possible for these fields to contain some residual (garbage) info.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All Db2 for z/OS users invoking IFCID 3 * * distributed threads. * **************************************************************** * PROBLEM DESCRIPTION: * * IFCID3 section 5 which is mapped by * * QTXA contains new fields after offset * * 88 that were not properly initialized * * resulting in dirty data. * **************************************************************** * RECOMMENDATION: * * Apply corrective PTF when available. * **************************************************************** The QTXA macro was expanded when IRLM secondary latch contention counters were enhanced. This macro is shared by both IFCID002 and IFCID003, but the new fields are currently only applicable to IFCID 2. IFCID 3 processing did not clear out the unused fields resulting in dirty data in section 5.
Problem conclusion
Db2 has been modified to initialize the new fields in QTXA for IFCID3 so that only zeros will display.
Temporary fix
Comments
APAR Information
APAR number
PH06754
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
B10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-01-02
Closed date
2019-02-22
Last modified date
2019-04-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI61450 UI61451
Modules/Macros
DSNWVCSP DSNWVAPR DSNWVCST DSNWVZIT DSNB1TAD DSNWAACT DSNWVZSA DSNWZDG2 DSNX8SMF DSNTXACT DSNDQTXA DSNWAAPI DSNWARDS DSNWACDF DSNTLRST DSNWVSMT DSNTLRAC DSNWAFRR DSNXTAD DSNTXSTB DSNWVZPS
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEPEK","label":"Db2 for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.0","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.0","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
02 April 2019