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PM91497: WMQ Z/OS 7.1.0: QUEUE MANAGER IN QUEUE SHARING GROUP ABENDS S026 REASON=08118001 CONNECTOR HANG

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Queue manager in a Queue Sharing Group abends s026
    dump title
    ABEND S026,REASON=08118001 CONNECTOR HANG:
    CONNAME=CSQExxxxyyyyyy,JOBNAME=ssidMSTR
    due to a deadly embrace between a DISPLAY QSTATUS command being
    processed (PCF command from the MQ Explorer) at the same time as
    structure recovery is taking place.
    .
    Additional keywords:
    CSQM1DQQ CSQISREC
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ Version 7          *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: After a DISPLAY QSTATUS command was     *
    *                      issued immediately after a CF structure *
    *                      loss of connection recovery was         *
    *                      complete an abend 026-08118001 is       *
    *                      detected indicating a queue manager     *
    *                      hang condition.                         *
    *                                                              *
    *                      In certain circumstances the S026 abend *
    *                      could result in abend S30D-00000000 and *
    *                      queue manager termination               *
    *                      S6C6-00E50054.                          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The hang condition is caused by a deadly embrace between the
    processing of the DISPLAY QSTATUS command and the CF structure
    task reconnecting to a shared queue for the first time after the
    structure has been recovered following a loss of connection.
    

Problem conclusion

  • The reconnect logic to a CF structure has been modified to
    execute the process that caused the deadly embrace
    asynchronously in another thread avoiding the DISPLAY QSTATUS
    waiting while holding a latch restricting access to the resource
    that caused the hang.
    100Y
    CSQECONN
    CSQEKATM
    CSQMKATM
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PM91497

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2013-06-20

  • Closed date

    2013-07-10

  • Last modified date

    2013-09-03

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

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

    UK95705

Modules/Macros

  • CSQECONN CSQEKATM CSQMKATM
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UK95705

       UP13/08/23 P F308 Ž

Fix is available

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Document Information

Modified date:
03 September 2013