IV19976: Probe AD031045 from adiWriteFile in a multi-instance queue manager

Fix Pack 7.1.0.1 for WebSphere MQ V7.1
WebSphere MQ V7.1 for i5/OS Fix Pack 7.1.0.1
Fix Pack 7.1.0.2 for WebSphere MQ V7.1

APAR status

• Closed as program error.

Error description

• A probe AD031045 FDC, with the first data block in the FDC
  being the value 9 (meaning EBADF), from adiWriteFile in a
  multi-instance queue manager may be encountered. Examples
  showing the data block containing the value 9 are:
  
  Example 1:
  ---------{ xcsFFST
  ....
  ffffffff6f93ba70                  00000009                ....
  ....
  
  Example 2:
  ----------{ xcsFFST
  ....
  0x406c3750                        09000000                ....
  
  The EBADF is the error return from an action (such as seek) on
  a bad file descriptor. Other FDCs may be reported from other
  locations in MQ for attempts to act on a bad file descriptor.
  
  Another possible issue that could be encountered, relating to
  this problem, would be corruption of a queue file.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This problem only affects a queue manager configured to be
  multi-instance. Then, there is a small risk of the problem being
  encountered subsequent to queue files being closed.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows)
  ****************************************************************
  PROBLEM SUMMARY:
  When a queue manager is configured as multi-instance, the
  opening and closing of queue files between multiple threads is
  not handled reliably, and there is therefore the possibility of
  file descriptor confusion between threads.
  

Problem conclusion

• The logic for handling queue files for queue managers configured
  as multi-instance, has been reworked to ensure management of
  queue files is correctly performed without confusion between
  threads.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.1
  Platform           Fix Pack 7.1.0.2
  --------           --------------------
  Windows            U200351
  AIX                U853019
  HP-UX (Itanium)    U853052
  Solaris (SPARC)    U853048
  Solaris (x86-64)   U853054
  iSeries            7.1.0.2
  Linux (x86)        U853049
  Linux (x86-64)     U853053
  Linux (zSeries)    U853050
  Linux (Power)      U853051
  
  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:

  IV12752

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WMQ AIX V7

• Fixed component ID

  5724H7221

Applicable component levels

• R710 PSY

     UP