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

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 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