PK99282: DFHSM0002 SEVERE ERROR CODE 030D IN DFHSMGF FOLLOWED BY DFHSO0001 ABEND 0C4/AKEX AT OFFSET X'3F22' IN MODULE DFHSOLS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are running CICS Transaction Server 3.2 and receive the
  following messages in your Web Owning region:
  DFHSM0002 A severe error (code X'030D') has occurred
            in module DFHSMGF.
  DFHSO0001 An abend (code 0C4/AKEX) hasoccurred
            at offset X'3F22' ( 3F22 ) in module DFHSOLS.
  Transaction CSOL was running and attempted to getmain a
  SOCKET control block.  The first free cell in this subpool was
  corrupted with zeros.
  The SO0001 error was a follow on to the above error, since
  the getmain for the socket failed, the STE control block was not
  updated.
  We believe this problem of the overlay of zeros is timing
  related.
  Additional keywords: SM0002 QPH Quickcell_getmain_invalid_QPF
  Timing involves a task freemaining a WEBSTATE BLOCK from
  subpool WEB_STA, on one TCB.  Close to this time, another
  task, running on a different TCB, such as the SL, getmains
  storage from a subpool, that happens to get the page of
  storage just freed by the other task.   This has been
  seen to also affect the XMTRANSN subpool, which can cause
  an ABEND0C4 in DFHXMTA at offset x'2E4' and the following
  message:
  DFHDS0001 An abend (code ---/AKEC) has occurred at
            offset X'0218' in module DFHDSKE.
  KIXREVEPH
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHSM0002 severe error code X'030D'     *
  *                      from DFHSMGF due to failed getmain      *
  *                      from a subpool with a corrupted         *
  *                      QPH (Quickcell Page Header).            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The SOCKET subpool QPH chain was corrupted by an overlay of
  zeroes at the start of the first free element, causing a
  severe error code X'030D' to be detected by DFHSMGF on the
  first subsequent getmain of a SOCKET by CSOL.
  The overlay was caused by DFHWBST clearing the WEBSTATE
  block storage after freemaining the storage. CSOL, running on
  SL TCB, gained control after the freemain of the WEBSTATE
  block was complete, but before DFHWBST cleared the storage.
  CSOL performed a getmain for a SOCKET and a new page of
  storage was acquired by the sockets subpool, which contained
  the area just freed from the WEBSTATE block. The page of
  storage was formatted as part of the SOCKET subpool quickcell
  storage before control returned to the task which freed the
  WEBSTATE block, running on the QR TCB. This task then zeroed
  the storage which belonged to the former WEBSTATE block,
  corrupting the next free element in the SOCKET subpool
  quickcell chain.
  This lead to DFHSM0002 severe error code X'030D' on the next
  getmain for a SOCKET by CSOL and a subsequent error,
  DFHSO0001 abend0c4/AKEX in DFHSOLS due to the failure of the
  getmain resulting in the SOCKET address not being set in the
  STE.
  The underlying problem of storage corruption can cause various
  symptoms depending which subpool acquires the page of storage
  which becomes available on freemain of the WEBSTATE block.
  Additional keywords: 0C4 MSGDFHSM0002 MSGDFHSO0001 SO0001
  SM0002 abendAKEA 030D XMTRANSN DFHXMTA abendAKEC AKEC DFHDSKE
  abendAKEX AKEA
  

Problem conclusion

• DFHWBST has been altered to clear the WEBSTATE block storage
  before the freemain, rather than after it.
  

Temporary fix

• *********
              * HIPER *
              *********
  FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK98561

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

  UK51584

Modules/Macros

• DESWBST  DFHWBST
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK51584

     UP09/11/06 P F911

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.