IC74941: Client application generates FDC file with Probe ID XC130031 after being denied access by a server-side security exit.

WebSphere MQ V7.0 Fix Pack 7.0.1.6
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.6

APAR status

• Closed as program error.

Error description

• A WebSphere MQ V7 Client application receives a memory
  exception and then terminates after being denied access to a
  queue manager by a server-side security exit.
  
  The client also has a security exit defined.
  
  A FDC file is written by the application process, showing:
  
  Probe Id   XC130031
  Component  xehExceptionHandler.
  
  It will also show similar information to this:
  
  MQM Function Stack
  MQCONN
  trmzstMQCONNX
  reqDoConnect
  reqConnectChl
  reqFreeSess
  rriFreeSess
  rriTermExits
  xcsFFST
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of WebSphere MQ client application programs, where there
  is a client-side security exit.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows)
  ****************************************************************
  PROBLEM SUMMARY:
  A client connection can be ended early in its life, for example
  during the security exchange that takes place between security
  exits.
  
  There is a situation where this can happen during startup of a
  channel that is in principle eligible for sharing
  conversations, but is the first such channel. In this situation,
  the full initialization of WebSphere MQ's internal
  client state has not taken place.
  
  In this situation, the early ending of the channel leads to a
  code path being taken to clean up WebSphere MQ's internal
  client state relating to a client-side security exit. In doing
  this, a pointer is de-referenced, but the pointer is null.
  

Problem conclusion

• WebSphere MQ code has been corrected to avoid de-referencing a
  null pointer in the case described above.
  
  A workaround for this problem is to set SHARECNV(0) on the
  channel definition being used.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.6
  --------           --------------------
  Windows            U200328
  AIX                U840698
  HP-UX (PA-RISC)    U841555
  HP-UX (Itanium)    U841560
  Solaris (SPARC)    U841556
  Solaris (x86-64)   U841562
  iSeries            tbc_p700_0_1_6
  Linux (x86)        U841557
  Linux (x86-64)     U841561
  Linux (zSeries)    U841558
  Linux (Power)      U841559
  
  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 WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R701 PSY

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