A fix is available
APAR status
Closed as unreproducible.
Error description
Loop occurs following a CEMT I TAS TRAN(xxxx) request. The dump shows that CICS is at MAXTASK with 55,000+ tasks queued for TCLASS reasons. CICS trace shows that the CEMT task is looping doing EXEC CICS INQUIRE TASK commands, passing a transaction number of zeroes. The INQUIRE TASK request is issued out of module DFHEMT56. . Additional Symptom(s) Search Keyword(s): KIXREVrer UNKNOWN_TRANSACTION_NUMBER LISTNUM REALLNUM TASKIDERR
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All CICS users. * **************************************************************** * PROBLEM DESCRIPTION: CEMT INQUIRE TASK TRANSACTION command * * becomes stuck in an infinite loop if a * * large number of tasks (over 55,000) * * queued up in a CICS region due to * * TClass reasons. * **************************************************************** * RECOMMENDATION: * **************************************************************** A CICS user issues a CEMT I TASK TRANSACTION command when there are a large number of tasks (over 55,000) queued up in the CICS region due to TClass reasons. Module DFHEMT56 is used to do the inquire task action and the variable used to control the loop is defined as signed half word which means the maximum value it can hold is 32767.As a result, when the loop which is going through each task on the system exceeds 32767, the value of the variable becomes negative and therefore does not increment the task number issued by the DFHXMIQ INQUIRE TRANSACTION which remains zero.
Problem conclusion
Temporary fix
********* * HIPER * ********* FIX AVAILABLE BY PTF ONLY
Comments
DFHEIN56 and DFHEMT56 have been updated to create a variable which is a full-word version of original half-word version that is used to control the loops in the GENTASK procedure. Doing so allows the loop to iterate up to the value of LISTNUM since now both variables have the same definitions.
APAR Information
APAR number
PM41417
Reported component name
CICSTS V3 Z/OS
Reported component ID
5655M1500
Reported release
500
Status
CLOSED UR3
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2011-06-13
Closed date
2011-08-05
Last modified date
2011-12-22
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Modules/Macros
DFHEIN56 DFHEMT56
Fix information
Fixed component name
CICSTS V3 Z/OS
Fixed component ID
5655M1500
Applicable component levels
R500 PSY UK70718
UP11/08/16 P F108
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.
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Document Information
Modified date:
22 December 2011