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PI14206: QR TCB STUCK IN A WAIT OUT OF DFHKETA ON THE KCB_KE_LOCK

A fix is available

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APAR status

  • Closed as program error.

Error description

  • QR TCB is stuck in a wait out of DFHKETA on the KCB_KE_LOCK.
    The CO TCB is the owner of that lock but is simply in a normal
    no-work wait out of DFHDSDS3.  Lots of CWXN tasks are
    dispatchable on the QR TCB but the QR TCB is stuck in the wait
    out of DFHKETA
    
    
    
    
    
    Additional Symptom(s) Search Keyword(s): KIXREVDWZ
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: CICS hangs when CO TCB fails to unlock  *
    *                      the CICS kernel lock                    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A RACF change is made in the system and then an ENF notification
    comes into CICS. CICS runs a system task on the CO TCB to handle
    the ENF event because DFHSIT parameter SUBTSKS=1 is set. After
    this system task completes, the CO TCB obtains a kernel lock
    to first release the task back to the system, and then do an
    unlock.  Just before the unlock, a pointer that CO TCB will use
    is changed because of a new system task being attached on the QR
    TCB which results in an unlock failure.  Later all CICS TCBs
    wait indefinitely for the kernel lock and CICS begins to hang.
    

Problem conclusion

  • DFHKERN and DFHKEMT have been changed to avoid the unlock
    failure when detaching tasks.
    

Temporary fix

  •             *********
                * HIPER *
                *********
    FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PI14206

  • Reported component name

    CICS TS Z/OS V4

  • Reported component ID

    5655S9700

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-03-21

  • Closed date

    2014-06-15

  • Last modified date

    2014-09-08

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PI15695 UI19017 PI25251

Modules/Macros

  • DFHKERN  DFHKETA
    

Fix information

  • Fixed component name

    CICS TS Z/OS V4

  • Fixed component ID

    5655S9700

Applicable component levels

  • R700 PSY UI19017

       UP14/07/04 P F407 ½

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:
08 September 2014