PI26972: WMQ V710 - THE QMGR ABENDS WITH 5C6-00C510AB AFTER A DYNAMIC ALLOCATION HANG PROBLEM.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The QMGR ABENDs with 5C6-00C510AB after a dynamic allocation
  hang problem outside of MQ.
  
   A GRS display showed one TCB waiting for the SYSZTIOT ENQ,
  which was held by another TCB that was in dynamic allocation for
  archive log data set.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Connections to CF structures using SMDS *
  *                      hang if log archiving is in progress    *
  *                      and the archive tape system is          *
  *                      unavailable.                            *
  *                      Applications attempting to open shared  *
  *                      queues on affected structures will hang *
  *                      during MQOPEN processing.               *
  *                      If XCF requires a response from the     *
  *                      queue manager while the structure task  *
  *                      is hung, it may terminate the task      *
  *                      S026, resulting in abnormal queue       *
  *                      manager termination with reason code    *
  *                      00C510AB                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During structure connection processing, the structure task will
  attempt to connect to the SMDS for the structure, and requires
  the SYSZTIOT ENQ in order to do so.
  During log offload processing it is possible for the allocation
  of the archive log dataset to suspend while holding the SYSZTIOT
  ENQ due to the necessary tape subsystems being unavailable.
  In this situation the structure task will suspend until the
  log archive processing releases the ENQ, and consequently
  delaying applications attempting to use shared queues on the
  structure.
  If the structure task is required to respond to an XCF event,
  it will be unable to do so until the ENQ is released and
  processing resumed, which can lead to XCF detecting a connector
  hang and abending the task S026-08118001 or S026-08118002 and
  can lead to abnormal queue manager termination.
  

Problem conclusion

• When connecting to the SMDS for a structure, CSQEDSI3 will
  attempt dynamic allocation of the SMDS conditionally on the
  SYSZTIOT ENQ being available.
  If the ENQ is unavailable after several retries have been
  made CSQE222E will be issued to report the failure, and the
  SMDSCONN will be changed to STATUS(ALLOCFAIL) AVAIL(ERROR).
  
  Applications attempting to put or get large messages on the
  SMDS will fail with MQRC_DATA_SET_NOT_AVAILABLE (MQRC 2561)
  until the ENQ is released and the SMDS connection is
  successfully made.
  
  Additional Keywords: MQSMDS/K
  
  Topic zm_E222E in the knowledge centre is updated:
  WebSphere MQ
   Reference
    Messages
     Coupling Facility manager messages (CSQE...)
      CSQE222E: Dynamic allocation of SMDS(qmgr-name)...
  
  The 'System programmer response' section has the following
  additional information added:
  "When the reason code is '02540000', indicating that the
  allocation failed due to a required ENQ being unavailable,
  the queue manager will automatically retry the allocation
  request on subsequent attempts to access the SMDS."
  100Y
  CSQEDSB2
  CSQEDSC1
  CSQEDSC3
  CSQEDSI1
  CSQEDSI3
  CSQEMPUT
  CSQIMGES
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  PI32780 UI25106

Modules/Macros

• CSQEDSB2 CSQEDSC1 CSQEDSC3 CSQEDSI1 CSQEDSI3 CSQEMPUT CSQIMGES
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI25106

     UP15/03/04 P F503 ¢

Fix is available

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