A fix is available
APAR status
Closed as program error.
Error description
Customer got: DFHSM0001 An abend (code 0C4/AKEA) has occurred at offset X'0C6A' in module DFHSMGF The dump shows two tasks being attached at the same time. .Kernel Error data: Err_Num Err_Time KE_NUM Task Error Type Err_Code Module 00000025 16:33:05 03F9 86465 PROGRAM CHECK 0C4/AKEA DFHAPXM 00000026 16:33:05 00BF 86466 PROGRAM CHECK 0C4/AKEA DFHSMGF .Kernel summary data: KE_NUM Status TCA_Addr Tran# Tran ID DS_TASK KE_KTCB Error 03F9 Not Running 1E9C5100 86466 CSXM 55023B00 4B293000 *YES* 00BF ***Running** 1E9C5100 86466 CSXM 54FDD380 1E751200 *YES* .Application data: Tran Tran Orig TCA TWA EIB SEIB EIS EIUS No ID Tran Addr Addr Addr Addr Addr Addr 86466 £5QH £5QH 1E9C5100 00000000 20710100 1E9C5488 1E9C5388 20710008 86466 CSXM CSXM 1E9C5100 00000000 20710100 1E9C5488 1E9C5388 20710008
Local fix
NA
Problem summary
**************************************************************** * USERS AFFECTED: All CICS Users. * **************************************************************** * PROBLEM DESCRIPTION: Two tasks attaching at the same time * * obtain the same TCA address. * **************************************************************** A Liberty Task is running on a T8 TCB and requires a transaction environment. This causes XMAT BUILD_TRANSACTION to be called to attach the transaction. This task obtains the XMATTLCK to serialise attach processing. At the same time another task requires a transaction environment to continue processing (for example the output of the US0200 message for a user timing out). This second task calls DFHXMXE GET_TXN_ENVIRONMENT which does not obtain XMATTLCK. This means two tasks can potentially obtain the same TCA address and this can lead to failures later in processing.
Problem conclusion
DFHXMXE has been updated to obtain and release the XMATTLCK around the call to get_non_xm_resources.
Temporary fix
Comments
APAR Information
APAR number
PH36206
Reported component name
CICS TS Z/OS V5
Reported component ID
5655Y0400
Reported release
200
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-04-12
Closed date
2021-06-11
Last modified date
2021-07-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI75864
Modules/Macros
DFHXMXE
Fix information
Fixed component name
CICS TS Z/OS V5
Fixed component ID
5655Y0400
Applicable component levels
R200 PSY UI75864
UP21/06/15 P F106
Fix is available
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[{"Type":"MASTER","Line of Business":{"code":"LOB35","label":"Mainframe SW"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSGMGV","label":"CICS Transaction Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions"}]
Document Information
Modified date:
03 July 2021