A fix is available
APAR status
Closed as program error.
Error description
Your CICS region hangs with two tasks in a deadly embrace. One task owns the XMLOCK but wants the DUSYSDMP lock, while another task owns the DUSYSDMP lock but wants the XMLOCK. Neither task can proceed. Often these are a CEMT transaction and the CICS TCP task, tranid CSTP. Other tasks will eventually backup behind this deadly embrace, and may cause other symptoms as well. In some instances, the CPSM MAS agent tasks may issue a message similar to this: . EYUCT0105E Transport Services control block shortage has occurred. . This is because the CPSM MAS agent tasks in the region can not run as they are also stuck behind the deadly embrace. This is not a CPSM problem, but rather CPSM is a victim here. . These are the same symptoms as PH58961 - but the cause is different.
Local fix
Cycle CICS
Problem summary
**************************************************************** * USERS AFFECTED: All CICS users. * **************************************************************** * PROBLEM DESCRIPTION: CEMT or EXEC CICS SET SYDUMPCODE * * can cause CICS to stall with two * * tasks in a deadly embrace. * **************************************************************** A CICS task is processing CEMT or EXEC CICS SET SYDUMPCODE when another task causes a message to be issued. CICS suffers a locking problem between the two tasks. Each task contends for the XMLOCK and DUSYSDMP locks. The CICS tasks stall in SUSPENDs for the locks. If a dump is taken then it will show two tasks in a deadlock. One of then will have issued a SET SYDUMPCODE command.
Problem conclusion
CICS SET SYDUMPCODE processing has been changed to prevent the need for the XMLOCK to be used.
Temporary fix
Comments
APAR Information
APAR number
PH61201
Reported component name
CICS TS Z/OS V6
Reported component ID
5655YA100
Reported release
400
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2024-05-02
Closed date
2024-07-24
Last modified date
2024-08-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI97768 UI97769
Modules/Macros
DFHMEIN
Fix information
Fixed component name
CICS TS Z/OS V6
Fixed component ID
5655YA100
Applicable component levels
Fix is available
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Document Information
Modified date:
01 August 2024