PH55167: CSQM568E CSQMDDPT DELIVERY DELAY PROCESSOR ENDED ABNORMALLY, MQRC=2069 (MQRC_SIGNAL_OUTSTANDING)

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQRC_SIGNAL_OUTSTANDING is being return on an MQGET from the
  SYSTEM.DDELAY.LOCAL.QUEUE by the delivery delay processor. QMGR
  trace and SYSTRACE showed that there was overlapping processing
  during an earlier MQGET which got a message and a message
  arriving on the queue and the signal ECB being posted. There is
  a timing window in this processing where the signal ECB is left
  in a posted state which results in a later WAIT on the ECB
  falling through immediately, leading to incorrect processing by
  the delivery delay processor.
  
  This timing window is not unique to the delivery delay
  processor and could result in MQRC_SIGNAL_OUTSTANDING being
  returned for MQGETs with MQGMO_SET_SIGNAL for other tasks.
  

Local fix

• To Disable/Enable PUT/GET properties of
  SYSTEM.DDELAY.LOCAL.QUEUE queue restarted the Delivery Delay
  Processor
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0 and                 *
  *                 Release 3 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: An MQGET from the delivery delay        *
  *                      processor fails with MQRC 2069          *
  *                      MQRC_SIGNAL_OUTSTANDING and the         *
  *                      delivery delay processor ends           *
  *                      abnormally.                             *
  ****************************************************************
  There is a timing window in MQ Signal Processing which allows an
  MQGET which got a message and a message arriving on the queue to
  post a signal ECB to overlap. The result is that a signal ECB is
  left in a posted state which results in a later WAIT on the ECB
  failing meaning a subsequent MQGET call will fail with MQRC 2069
  MQRC_SIGNAL_OUTSTANDING.
  
  This timing window is not unique to the delivery delay processor
  as it can result from MQGET calls using MQGMO_SET_SIGNAL in
  other applications.
  

Problem conclusion

• Serialisation has been added to remove the timing window to
  prevent the documented APAR symptoms from occurring.
  

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:

  UI95260 UI95261

Modules/Macros

• CSQMGET
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI95261

     UP24/02/14 P F402 ¢

• R300 PSY UI95260

     UP24/02/14 P F402 ¢

Fix is available

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