PH65143: ABN= 5C6-00E7000F,C=MQ900.940.CHIN ,LOC=CSQXJST .CSQXBADF+OFFSET

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After migrate to MQ 9.4 CHIN ended abnormally with the
  following messages:
  
  CSV025I PROGRAM CONTROLLED MODULE CSFPPRF  NOT ACCESSED, USER
  UNAUTHORIZED
  
  ...
  
  CSQX005E CSQXJST Channel initiator failed to start
  
  The following dump was recorded:
  
  ABN= 5C6-00E7000F,C=MQ900.940.CHIN           ,LOC=CSQXJST
  .CSQXBADF+offset
  
  
  The abend occurred when CHIN initialisation in xrnEntropyReadZ
  tried to call ICSF callable service CSFPPRF. The LOAD of this
  module failed at startup due to the CHIN user not being
  authorised, per the message in the CHIN joblog:
  
  CSV025I PROGRAM CONTROLLED MODULE CSFPPRF  NOT ACCESSED, USER
  UNAUTHORIZED
  
  The intent is that if we can't call CSFPPRF then we fall back
  on another method for getting random numbers. The problem in
  this case is that when CSQXLMOD loaded the module, it didn't
  overwrite the address of the 'bad function code' module
  (CSQXBADF) in the function table for CSFPPRF.
  
  Possibly before the migration, message CSQX571E with reason
  00000806 was issued at CHIN startup.
  
  The logic which loads CHIN modules was changed between V920 and
  V940.
  

Local fix

• Correct the authorisation problem with CSFPPRF.
  
  Or
  
  Set a TUNING parm before the CHIN starts up:
  
  /cpf RECOVER QMGR(TUNE ChinEntropyAlg 2)
  
  Setting this tuning parm to this value results in
  xrnEntropyReadZ not trying to call CSFPPRF and instead straight
  away falls back on the other method for getting random numbers.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 4 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: The Channel Initator fails to start     *
  *                      with abend code 5C6-00E7000F.           *
  ****************************************************************
  During the startup of the Channel Initator, the function CSFPPRF
  failed to load leaving its internal reference to the bad
  fallback address 'CSQXBADF'. When the Channel Initator later
  attempts to call CSFPPRF, it calls the bad function code
  'CSQXBADF' and causes the 5C6-00E7000F abend.
  

Problem conclusion

• The code has been updated so that if CSFPPRF fails to load
  during Channel initator startup, CSQXBADF will not be called
  when attempting to use CSFPPRF.
  
  Any authorisation problems seen with CSFPPRF should still be
  corrected.
  

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:

  UO03863

Modules/Macros

• CMQXRAND
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R400 PSY UO03863

     UP25/07/12 P F507

Fix is available

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