IT30721: FDC with probe ID XC130031 (Access violation/SIGSEGV) reported during client application disconnect

APAR status

• Closed as program error.

Error description

• A 'C' client application connected to a queue manager providing
  an MQSCO structure with a non-null AuthInfoRecPtr field, a value
  of zero was supplied for the AuthInfoRecCount field. When the
  application disconnected a failure data capture (FDC) record
  with probe XC130031 was produced indicating a segmentation
  violation had occurred.
  

Local fix

• Code application to provide a NULL AuthInfoRecPtr.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Any native applications that provide MQSCO SSL configuration
  options programmatically via MQCONNX are potentially affected.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A client application connected using custom SSL configuration
  options provided via an MQSCO structure, when the application
  disconnected from the queue manager a segmentation violation
  occurred in the MQDISC call, an FFST with a probe id of XC130031
  was produced.
  

Problem conclusion

• In processing of a client application disconnect, various
  resources are freed, this includes memory used to retain a copy
  of the optional MQSCO and MQAIR values provided by an
  application. The IBM MQ KnowledgeCenter states that the
  AuthInfoRecPtr field of the MQSCO is ignored if the
  AuthInfoRecCount is zero - this does not occur and can cause a
  segmentation violation and FFST during application disconnect.
  
  The logic used to cleanup MQAIR resources during application
  disconnect is corrected to use the value of AuthInfoRecCount.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.14
  v9.0 LTS   9.0.0.9
  v9.1 CD    9.1.5
  v9.1 LTS   9.1.0.5
  
  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

  IBM MQ BASE MP

• Fixed component ID

  5724H7251

Applicable component levels