PI52073: A LOGICAL GROUP FLAG HAS BEEN SET DUE TO RSTCHECKFORONEMESSAGE IN THE CHIN ISSUING AN MQGET WITH A 'DIRTY' V2 MQMD.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A logical group flag has been set due to rstCheckForOneMessage
  in the CHIN issuing an MQGET with a 'dirty' V2 MQMD.
  The problem occurs when the last byte of MQMD MQMD.MsgFlags
  has a residual value with either the x10 or x08 bit set.
  The MQMD.MsgFlags are copied by CSQMGGRV into an internal
  MDE, and this internal MDE is used by CSQMGET at the
  end of MQGET processing to see if MQGS_LAST_MSG_IN_GROUP
  or MQGS_MSG_IN_GROUP needs to be set.
  ..
  Additional Symptom(s) Search Keyword(s):
  
  +0060 FFFFFFFF 00000000 00000000 00000000 | ................ |
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: An MQGET may return incorrect flags in  *
  *                      the returned GMO, when the message      *
  *                      retrieved is not representative of the  *
  *                      flags, when MsgFlags are set in the MD  *
  *                      or MDE passed to the MQGET call.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When a MQGET call is made, the MQMD or MQMDE passed with the
  call is used for later processing. When the MsgFlags field is
  set, such as MQMF_MSG_IN_GROUP or MQMF_LAST_MSG_IN_GROUP, these
  may be kept during the MQGET processing. With these fields set,
  the GMO returned with MQGET call can have GroupStatus field set
  to a value showing the message returned is a member of a group
  or last message in a group, even when the message retrieved is
  not in a message group.
  
  This problem is caused by the MQMDE passed in (or extracted from
  the MD) being used during the internal get from the specified
  queue. Some of the flags, which control the status flags
  returned in the MQGMO, are not cleared, resulting in the later
  processing of the MQGET setting the GMO flags, possibly
  incorrectly if the message retrieved does not represent this
  status.
  

Problem conclusion

• The processing for an MQGET in this circumstance has been
  altered to ensure the MD is valid and clean prior to the setting
  the GMO.GroupStatus, to ensure the correct output is returned.
  100Y
  CSQMGET
  CSQMGGRV
  

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:

  PI55568 UI34768

Modules/Macros

• CSQMGET  CSQMGGRV
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI34768

     UP16/03/03 P F603

Fix is available

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