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PI28079: WMQ Z/OS 7.0.1:0C4 IN CSQWVCOL AND SUBSEQUENT HANG

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABEND 5C6 - 00C511CE S=00000C17 occurred due to Admin Structure
    full:
    16:04:18.53 IEA794I SVC DUMP HAS CAPTURED: 365
    DUMPID=010 REQUESTED BY JOB (JOB1 )
    DUMP TITLE=CSQ1,ABN=5C6-00C511CE,S=00000C17,C=R3600.701.
    CFM -CSQEWUOW,M=CSQGFRCV,LOC=CSQELPLM.CSQEWUOW+00001250
    
    And then issued STOP Server command, SVCDUMP, TDUMP and CEEDUMP.
    SLIP TRAP C=0C4 with QMGR region was matched.
    16:07:45.54 IEA794I SVC DUMP HAS CAPTURED: 440
     DUMPID=012 REQUESTED BY JOB (JOB1 )
    DUMP TITLE=SLIP DUMP ID=C0C4
    16:07:57.94 IEA794I SVC DUMP HAS CAPTURED: 455
    DUMPID=013 REQUESTED BY JOB (JOB1 )
     DUMP TITLE=COMPON=WEBSPHERE Z/OS,COMPID=5655N0200,
     ISSUER=BBORMCDP,ERRNO=C9C20008
    
    After ABEND0C4, AppServer still hung. Finally AppServer was
    terminated by FORCE command. After that, tried to stop QMGR,
    but it went into hang.
    
    The codepath leads to the 0C4 in CSQWVCOL, which
    occurs due to recovery for the 5C6 abend incorrectly leaving
    the  address of an SKB in the queue manager address space set
    in the EB if   there was no previous SKB in the application
    address space associated  with the EB.
    
    
    
    
    Additional Symptom(s) Search Keyword(s):
    

Local fix

  • n/a
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 0 Modification 1 and Release 1       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend 0C4 occurs in CSQWVCOL when       *
    *                      WebSphere Application Server issues MQI *
    *                      requests using a private context, after *
    *                      an earlier attempt to commit work done  *
    *                      under the same context abended in MQ's  *
    *                      RRS prepare exit.                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Following an abend in MQ's RRS prepare exit (for example, due to
    the admin structure filling), CSQ3RRXF is called to recover from
    the abend.
    CSQ3RRXF failed to correctly restore the SKB associated with the
    context ACE, instead leaving EBSKB pointing to an SKB in the
    queue manager address space.
    The recoverable work under the context was successfully backed
    out, and WebSphere Application Server attempted to issue further
    MQI requests using the same context (for example MQBACK when
    being stopped).
    CSQMCPRH detected that EBSKB was still set, and assuming it
    pointed to a valid SKB in the application address space, did not
    allocate an SKB in the application address space. When it
    subsequently attempted to call CSQWVCOL, CSQWVCOL attempted to
    get stack storage using the SKB, however as the SKB was in the
    wrong address space this led to an attempt to access invalid
    storage and the reported 0C4.
    

Problem conclusion

  • CSQ3RRXF is changed to correctly restore EBSKB following an
    abend in MQ's RRS exits.
    010Y
    100Y
    CSQARIB
    CSQ3RRXF
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    PI28079

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    010

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2014-10-21

  • Closed date

    2014-11-26

  • Last modified date

    2015-02-03

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

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

    PI29147 UI23441 UI23442

Modules/Macros

  • CSQARIB  CSQ3RRXF
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R010 PSY UI23441

       UP15/01/16 P F501 Ž

  • R100 PSY UI23442

       UP15/01/16 P F501 Ž

Fix is available

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Document Information

Modified date:
03 February 2015