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PH00007: MQ Z/OS: ABN=5C6-00C5101A IN CSQEBMON

A fix is available

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APAR status

  • Closed as program error.

Error description

  • DUMP TITLE=CSQ1,ABN=5C6-00C5101A,U=SYSOPR,
    -CSQEBMON,M=CSQGFRCV,LOC=CSQELPLM.CSQEBMON
    
    *CSQV086E QUEUE MANAGER ABNORMAL TERMINATION REASON=00E50702
    
    IEF450I CSQ1MSTR CSQ1MSTR - ABEND=S6C6 U0000 REASON=00E50702
    
    The problem occurs due to the SCB associated with an application
    queue being deleted by termination checkpoint processing at the
    same time as list transition processing is attempting to
    locate and use the SCB.
    
    
    Additional Keywords:
    CSQV086E ABEND 5C6 ABEND5C6 00C5101A 00E50702
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0 and Release 1       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend code 5C6-00C5101A occurs in       *
    *                      module CSQEBMON after CF failure,       *
    *                      followed by abnormal QMGR termination.  *
    ****************************************************************
    The problem occurs during a very specific timing window &
    circumstance, involving both shared queues and triggering.
    
    The SCB associated with an application queue is being deleted,
    whilst at the same time as list transition processing attempts
    to locate and use this same SCB.
    
    This can occur during the following:
    CF Failure,
    STOP QMGR MODE(FORCE)
    

Problem conclusion

  • Extra latch and condition logic enabled at the call to the
    module where the problem ABEND was noted. This is to remove the
    particular window of time where processing could remove the SCB
    that list transition processing would be seeking out.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH00007

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-07-03

  • Closed date

    2019-10-31

  • Last modified date

    2019-12-11

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

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

    UI66190 UI66191 PH20205

Modules/Macros

  • CSQMLTR0
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI66190

       UP19/11/27 P F911 ¢

  • R100 PSY UI66191

       UP19/11/27 P F911 ¢

Fix is available

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Document Information

Modified date:
11 December 2019