PI23099: REPEATED CONNECTING / DISCONNECTING SUBSEQUENTLY ISSUE CSQE222E SMDS CFSTRUCT DYNAMIC ALLOCATION FAILED RC 4, RS 04100000

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Joblog shows repeated connections/disconnections occurring to
  structure LARGE prior to the allocation failure.
  Each time the structure is connected, CSQE241I is issued to
  report SMDS has STATUS(ACTIVE) for the structure, and on each
  disconnect it is issued to report SMDS has STATUS(EMPTY):
  CSQE005I !CSQ1 CSQECONN Structure LARGE connected as
  CSQEMQGPCSQL06, version=CCD78C1FD02BAA83 000633B3
  CSQE241I !CSQ1 CSQEDSG2 SMDS(CSQL) CFSTRUCT(LARGE)
  now has STATUS(ACTIVE)
  CSQE241I !CSQ1 CSQEDSG2 SMDS(CSQL) CFSTRUCT(LARGE)
  now has STATUS(EMPTY)
  IXL016I CONNECTOR CSQEMQGPCSQL06 TO STRUCTURE MQGPLARGE
  DISCONNECTING JOB CSQ1MSTR ASID 03B6 REQUESTED DISCONNECT
  REASON=NORMAL.
  CSQE006I !CSQ1 CSQECLOS Structure LARGE connection
  name CSQEMQGPCSQL06 disconnected
  
  However, on the last disconnect before the error there is no
  CSQE241I for STATUS(EMPTY), which suggests the code for
  disconnecting the SMDS datasets is not being executed.
  
  Looking at the CSQE006I messages reporting the structure
  disconnection, I can see that it is normally being issued by
  CSQECLOS, however the final disconnection is issued by
  CSQEOPEN. This suggests an error was detected during open
  processing, but after it had already established a connection
  to the structure.
  
  Looking at the codepath where CSQEOPEN disconnects from the
  structure I can see that it does not make the expected calls
  to disconnect the SMDS datasets, which would explain both the
  lack of CSQE242I message with STATUS(EMPTY) and the
  subsequent allocation failure due to the datasets still being
  in use.
  
   This APAR is raised so CSQEOPEN can be corrected to
  disconnect the SMDS datasets in this situation.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: When the queue manager connects to a CF *
  *                      structure using SMDS, it fails and      *
  *                      message "IKJ56246I DATA SET DSN NOT     *
  *                      ALLOCATED, FILE IN USE".                *
  *                      Messages CSQE222E, CSQE246I and         *
  *                      CSQE247I are also issued, and the SMDS  *
  *                      dataset is set into STATUS(ALLOCFAIL)   *
  *                      and AVAIL(ERROR).                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During a CSQEOPEN call for a structure, CSQECONN is called to
  connect to the structure. CSQECONN connects to the structure and
  the associated SMDS dataset. CSQEOPEN then encounters an error,
  and disconnects from the structure but not from the SMDS
  dataset, thus leaving the queue manager connected.
  When CSQEOPEN is called again for another connection request,
  it fails to dynamically allocate the SMDS dataset, as it finds
  it is already in use.
  
  Keywords:
  MQSMDS/K
  

Problem conclusion

• The code in CSQEOPEN was changed to disconnect from the SMDS
  dataset if it disconnects from the CF structure.
  100Y
  CSQEOPEN
  

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:

  UI21364

Modules/Macros

• CSQEOPEN
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI21364

     UP14/10/02 P F410

Fix is available

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