IT39514: Application crashes due to sigsegv when connecting to default queue manager

APAR status

• Closed as program error.

Error description

• Connection to a default queue manager by a client application
  fails and crashes with sigsegv
  .
  | Probe Id          :- XC130031
  | Application Name  :- MQM
  | Component         :- xehExceptionHandler
  | Major Errorcode   :- xecF_E_UNEXPECTED_SYSTEM_RC
  | Minor Errorcode   :- OK
  | Probe Type        :- MSGAMQ6119
  | Probe Severity    :- 1
  | Probe Description :- AMQ6109S: An internal IBM MQ error has
    occurred.
  | FDCSequenceNumber :- 0
  | Comment1          :- Access Violation at address 00000000
      when reading
  
  An Unhandled Exception detected in process 10010, on thread
  0x34E4.
  Type: EXCEPTION_ACCESS_VIOLATION (C0000005).
  Address: 0023:6057B1C0.
  The thread could not read from memory address 0x00000000.
  
  MQM Function Stack
  MQCONNX
  zswGetEntryPointsByName
  MQCONNX
  trmzstMQCONNX
  zstMQCONNX
  zstMQConnect
  zutObtainDefaultQMName
  xcsBrowseIniCallback
  xcsBrowseFileCallback
  zutDefQMCallback
  xcsFFST
  

Local fix

• A blank line after the "DefaultQueueManager:" stanza line of the
  mqs.ini file is the trigger condition for the issue
  issue. Ensure there is no blank line after the
  "DefaultQueueManager:" stanza to avoid the sigsegv.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users connecting to a default queue manager
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A programming error meant that an invalid variable access was
  made when reading default queue manager name from mqs.ini file
  

Problem conclusion

• The MQ code has been corrected to prevent the incorrect variable
  access when reading default queue manager name from mqs.ini file
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.6
  v9.x CD    9.3.0.0
  
  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

  MQ BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels