IT18909: MQ 7.5 32-BIT CLIENT APPLICATION HANGS OR CREATES FDC WHEN USINGAN MQ v9 CCDT FILE

APAR status

• Closed as program error.

Error description

• MQ 7.5 32-bit client application either hangs or causes an FDC
  to be created when using a CCDT
  file from MQ v9.
  
  If a hang occurs then trace of the client may show this call
  repeated in the trace file:
  
   --}! rrxGetFirstChannelDef rc=rrcW_TRUNCATED
  
  An FDC may be seen which is similar to this:
  
  | Probe Id          :- RM696020
  | Major Errorcode   :- rrcE_FILE_CORRUPT
  | Minor Errorcode   :- OK
  | Probe Type        :- MSGAMQ9517
  | Probe Severity    :- 2
  | Probe Description :- AMQ9517: File damaged.
  | FDCSequenceNumber :- 0
  | Arith1            :- 2078 (0x81e)
  | Arith2            :- 1946 (0x79a)
  |
  +---------------------------------------------------------------
  --------------+
  
  MQM Function Stack
  MQCONN
  MQCONN
  reqDoConnect
  reqNameListFromCCDT
  rrxGetFirstChannelDef
  rriConvertChannel
  xcsFFST
  

Local fix

• Use a CCDT from a queue manager that is older than MQ v9
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of IBM MQ v7.5 32-bit clients who wish to use a CCDT
  generated on a v9 queue manager may be affected by this issue.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  APAR IT11547 introduced the ability to use a CCDT file on an MQ
  client, even if the CCDT file had been created on a later
  version of MQ.  If a 32-bit MQ client tries to use a CCDT
  generated on an IBM MQ v9 server then it may hang or create an
  FDC due an incorrect length calculation.
  

Problem conclusion

• The length calculation which caused the problem was corrected in
  the MQ client logic.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.5       7.5.0.8
  
  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 BASE MULTIP

• Fixed component ID

  5724H7241

Applicable component levels