IBM Support

IT18218: AMQP listener service crashes following an error in acquiring subpool lock: probeid XY324103

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APAR status

  • Closed as program error.

Error description

  • After applying  a Linux kernel update and
    a restart of the queue manager, the AMQP listener
    process is unable to acquire the subpool lock.
    
    FDCs generated shows:
      Probe Id         :- XY324103
      Component        :- xstGetSubpoolsLock
      .
      Comment1         :- '22 - Invalid argument' from semop
      and
      Comment1         :- '43 - Identifier removed' from semop
    .
    .
      Probe Id         :- XC130003
      Component        :- xehExceptionHandler
      Major Errorcode  :- STOP
      Probe Type       :- HALT6109
      Arith1           :- 11 (0xb)
      Comment1         :- SIGSEGV: address not mapped(0xc)
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using AMQP Listener Service.
    
    
    Platforms affected:
    Linux on x86-64
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The AMQP listener service did not correctly handle the case
    where a operating system shared-memory semaphore was removed
    outside the control of MQ. The failure to handle this scenario
    resulted in an illegal memory access, which terminated the
    listener process.
    

Problem conclusion

  • The code is modified such that the error in obtaining the
    subpool lock is handled and the AMQP Listener thread ends
    gracefully.
    
    It is not expected that MQ's shared memory resources will be
    removed outside of MQ's control. Users should refrain from
    attempting to perform such removal. Any unexpected removal of
    MQ's shared memory resources should be investigated by the
    operating system administrator.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.7
    v9.0 CD    9.0.2
    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

    IT18218

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-12-02

  • Closed date

    2017-01-17

  • Last modified date

    2017-06-01

  • 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

  • R800 PSY

       UP

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Document Information

Modified date:
01 June 2017