OA49412: PDSE BMF PAGE READ AND WRITE FAILING TO UNPIN BUFFER PAGES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• PDSE recovery process may fail to free pinned buffer page after
  receiving control following a cancel that occurs during the
  reading or writing of a PDSE page.
  
  The affected BMF read module is IGWBIRP2 and write module is
  IGWBIWP2. Both of these modules call IGWBIPIN to pin pages being
  used during I/O processing.
  
  The associated recovery module IGWBIPNR is called without a page
  fix indicator being set.
  
  The failure may be reported as an ABENDA78 RC18 on a subpool
  fremain out of the module IGVSTSKT+01C0.
  
  Abridged SYSTRACE entries leading to the ABENDA78:
  ===========================================================
   SSRV    78  81474128  0000E601 00000000 00000000 Freemain
                         00EA00FF
  *SVCE     D  00000000_01476CF8  00000018 84000000 84A78000
               07041000 80000000
  ===========================================================
  
  Additional Keyword: PDSE/K
  
  Additional Symptom:  SA78-18
  

Local fix

• None as the page fixed storage is freed when the job is
  terminated.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All PDSE users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABENDA78-RC18 when attempting to free   *
  *                      space in a system subpool.              *
  *                      Trying to free a page that is still     *
  *                      fixed.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  There is a hole in BMF recovery, when BMF is Pinning a page, a
  cancel can occur while the pinning is going on. The caller of
  the pin module, sets the flag after calling the module, however,
  when a cancel occurs in the pin module after the pin was
  completed, leaves the page pinned and there is no indicator that
  the page was fixed by the caller.
  

Problem conclusion

• Modify callers of the module the pins the pages to set the flag
  before the call. This way if a cancel occurs, we will try to
  attempt to unpin the page.
   KEYWORDS: PDSE/K
  

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:

  UA80472 UA80473 UA80474

Modules/Macros

• IGWBIRP2 IGWBIWP2
  

Fix information

• Fixed component name

  EXTENDED DATA S

• Fixed component ID

  5695DF115

Applicable component levels

• RD10 PSY UA80472

     UP16/03/29 P F603

• R210 PSY UA80473

     UP16/03/29 P F603

• R220 PSY UA80474

     UP16/03/29 P F603

Fix is available

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