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IT17408: endmqm -i leads MQ to crash and reports FDC with probe ID XC130031

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APAR status

  • Closed as program error.

Error description

  • An IBM MQ queue manager terminates abrubtly when endmqm -i is
    issued. The following Failure Data Capture (FDC) record is
    generated:
    
    FDC summary:
    
    ...
    | Probe Id          :- XC130031
          |
    | Application Name  :- MQM
    |
    | Component         :- xehExceptionHandler
    |
    | SCCS Info         :-
    F:\build\slot1\p800_P\src\lib\cs\pc\winnt\amqxerrn.c,  |
    ...
    | Major Errorcode   :- xecF_E_UNEXPECTED_SYSTEM_RC
    ...
    | Comment1          :- Access Violation at address...
    ...
    MQM Function Stack
    ccxResponder
    rrxResponder
    ccxReceiveThreadFn
    cciProcessOne
    cciProcessUserData
    cciProcessAsyncRcv
    rriServerAsyncRcv
    rstReceiveMessageRequest
    rstCheckForOneMessage
    rstHandleMsgExpansion
    xcsFFST
    
    
    From the FDC the following waiter structure can be seen.
    
    hAsyncWaiter
           {
             Self:                 02::05::05-18155840
             Active                FALSE
             Status:               20800872
             Options:
    MQGMO_FAIL_IF_QUIESCING|MQGMO_SYNCPOINT|MQGMO_PROPERTIES_FORCE_M
    QRFH2
             SetTime:              2016-09-22 06:20:47.819
             DataLength            4096
    Page 29 of 41
             ReturnableLength      0
             hBuffer:              9612 : 0x0000000004A4AC60 :
    01::02::02-01678432
             InitialPropertyOption: None
             PropLength:           0
             WaiterConnId:         1293
             UsingAsync:           TRUE
             QueueChecked:         TRUE
             MasterWaiter:         02::05::05-18154944
             MasterWaiter->Active: FALSE
    

Local fix

  • Use endmqm -c (equivalent to endmqm with no flags) to gracefully
    quiesce the queue manager.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    All MQ users who issue endmqm -i against a running queue manager
    which has waiting getters inside an asynchronous consume
    operation.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A logic error when handling the immediate shutdown request could
    cause the queue manager to access an invalid memory address,
    which would terminate the queue manager process.
    

Problem conclusion

  • The MQ queue manager logic has been updated to avoid the
    termination in this case.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.6
    v9.0 LTS   9.0.0.1
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT17408

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-10-07

  • Closed date

    2016-11-18

  • Last modified date

    2019-08-05

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

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

Fix information

  • Fixed component name

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
05 August 2019