IBM Support

IT32247: A queue manager became unresponsive when an access violation in lcsFNCLinkAdd caused the AMQZLAA0 process to abnormally end

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APAR status

  • Closed as program error.

Error description

  • Applications can no longer connect to the queue manager, and
    multiple FDCs were generated with the first containing the
    following information:
    
    Probe Id     :- XC130031
    Component     :- xehExceptionHandler
    Process Name   :- C:\Program Files\IBM\WebSphere
    MQ\bin64\amqzlaa0.exe
    
    Last ObjectName  :- SYSTEM.CLUSTER.TRANSMIT.QUEUE
    Major Errorcode  :- xecF_E_UNEXPECTED_SYSTEM_RC
    Probe Description :- AMQ6109: An internal WebSphere MQ error
    has occurred.
    Comment1     :- Access Violation at address 000000000000062C
    when reading
    
    Stack trace:
    
    Module!Function+Offset [File Name # Line+Offset @ Address]
    
    : amqadh2!lcsFNCLinkAdd+0x376
    : amqknl2!kqiOpenQueue+0x9c9
    : amqknl2!kqiOpenIt+0x5f4
    : amqknl2!kpiMQPUT1+0x60c
    : amqzai2!zsqMQPUT1+0x808
    : amqzai2!zlaMQPUT1+0x927
    : amqzai2!zlaProcessMQIRequest+0x1148
    : amqzlaa0!zlaProcessMessage+0x351
    : amqzlaa0!zlaMainThread+0x910
    : amqxcs2!ThreadMain+0x2c9
    
    
    Following the first FDC, these FDCs were also generated:
    
    ZL043050
    zlaMainThread
    amqzlaa0
    xecF_E_UNEXPECTED_RC
    Unknown(7F)
    
    ZL043105
    zlaMainThread
    amqzlaa0
    STOP
    
    XC589165
    xihCSThreadClear
    amqzlaa0
    xecS_E_BLOCK_NOT_FREE
    
    XC307100
    xlsRequestMutex
    amqzlaa0 4216 24149
    xecL_W_LONG_LOCK_WAIT
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users that observe an unresponsive queue manager and have found
    an access violation (often address 62C)  reported in an FDC,
    specifically from lcsFncLinkAdd.
    
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    An internal routine was unable to acquire a pointer for an
    unknown reason. The invalid pointer resulted in a memory access
    violation.
    

Problem conclusion

  • The root cause of the problem was not discovered from the
    information available and this APAR delivers preventative code
    and diagnostic enhancements. If the error condition is observed,
    it will be logged and the invalid pointer will not be used.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.16
    v9.0 LTS   9.0.0.11
    v9.1 CD    TBC.
    v9.1 LTS   9.1.0.7
    
    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

    IT32247

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-03-20

  • Closed date

    2020-07-10

  • Last modified date

    2020-07-10

  • 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

    IBM MQ BASE MP

  • Fixed component ID

    5724H7251

Applicable component levels

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

Document Information

Modified date:
11 July 2020