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Status Delivered
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on Dec 16, 2022

RELATED IDEAS

Occurrences of "false errors DFHAP1301".

Case TS008672927 has the details of the issue. A summary follows:
There is an automation that cancels tasks that have reached established resource usage limits and, if they are accessing DB2, they suffer AD2R abend, however in some cases the DFHAP1301 error occurs. This occasional situation happens when the LE recovery process (abend U0999, due to task cancellation) takes longer than usual and causes a new abend, AICA, detected by CICS, generating a new abend U0999. This combination causes the LE to return to CICS a return code indicating the corruption of LE blocks (DFHAP1301).
According to the CICS and LE Labs, the products are performing according to the design, however there is the possibility of opening an enhancement request to review this process. A factor that can contribute to reduce the potential of this scenario is to change the TRACE option in the TERMTHDACT parameter by MSG, avoiding the consumption of time in the generation of trace in the occurrences of LE abends. The customer asked to open an enhancement request to avoid this "misinterpretation" of error AP1301 by CICS.

Idea priority Low
  • Guest
    Reply
    |     Apr 12, 2024
    The message explanation has been enhanced in CICS TS 6.2 which has been announced and will GA June 14th 2024.

    See Announcement letter https://www.ibm.com/docs/en/announcements/AD24-0164
  • Guest
    Reply
    |     Jan 10, 2023
    CICS Development: CICS and LE are working as designed when LE detects a loop. However the explanation of message DFHAP1301 is incorrect in that it does not exaplain the message is produced when LE detects a loop. We will change change the Explanation and User Response of message DFHAP1301 from "Language Environment has issued a Return Code 8 indicating its control blocks are corrupted" to "Language Environment has issued a Return Code 8 indicating either that its control blocks are corrupted or that it has detected a loop" and "Investigate the cause of the corruption of the Language Environment control blocks" to "Investigate the cause of the corruption of the Language Environment control blocks or loop" respectively.
  • Guest
    Reply
    |     Jan 4, 2023

    Hello. Thanks for your update.

    Actually, customer is changing the option to TERMTHDACT(MSG) and we believe it will avoid the problem. However, as this situation seems to be a "misinterpretaion of error AP1301" by CICS and it was considered in the case TS008672927 as a good candidate for a future enhancement, customer decided to suggest the possibility of review.

  • Guest
    Reply
    |     Jan 4, 2023
    CICS Development: We already document that use of TERMTHDACT(TRACE) is not good in a production environment. See https://www.ibm.com/docs/en/SSGMCP_5.4.0/tuning/dfht3f1.html. I will paste the contents below:

    "Minimizing the time Language Environment spends writing dump output to transient data queue CESE

    The Language Environment® runtime option TERMTHDACT controls the type and amount of diagnostic output produced by Language Environment for an unhandled error.

    Using TERMTHDACT(DUMP), TERMTHDACT(TRACE), TERMTHDACT(UADUMP), or TERMTHDACT(UATRACE) can create a significant overhead in a production environment. These settings can cause large amounts of traceback and Language Environment dump data to be written to the CESE transient data queue.

    If a traceback or CEEDUMP is not needed by the application environment, use TERMTHDACT(MSG) to eliminate the performance overhead of writing formatted CEEDUMPs to the CICS® transient data queue CESE. If the traceback or CEEDUMP is required by the application, specify the CICSDDS option of TERMTHDACT to direct the Language Environment diagnostic output to the CICS dump data set, rather than to the CESE transient data queue."

    So has the customer tried using TERMTHDACT(TRACE,CICSDDS) to avoid thjis problem?

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