PM04294: TIGHT LOOP IN CPIR TRANS AFTER CEDA INSTALL PIPELINE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are experiencing a CICS hang issue when you do a
  .
  CEDA INSTALL PIPELINE.
  .
  There is a loop occurring in DFHPIWR at UK44505 between the
  offsets of x'32DA' and x'33FC'.  The problem has occurred
  because a forward pointer was not correctly updated when
  adding a new WEBSERVICE control block.  The problem appears
  to be fixed at CICS TS 4.1.
  Additional Symptom(s) Search Keyword(s):
  Stack for the CIPR shows DFHPIWR is performing function
  RESOLVE_ALL_WEBSERVICES
  DFHPIWR is chaining through the Webservice Resource control
  blocks or WSBCTL. the chain pointer is at offse x'2C' - field
  PI_WSBCTL_FORWARD_PTR.
  You are able to see this loop reflected in the dump by going
  to the PI domain.
  
  KIXREVRJL  hang lockup looping  offsets 32DA 33FC
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS hangs when you issue CEDA INSTALL  *
  *                      PIPELINE.                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During the processing of an INSTALL PIPELINE request,
  the DFHPIWR RESOLVE_ALL_WEBSERVICES procedure uses the
  WCB forward pointer (PI_WSBCTL_FORWARD_PTR) to run down
  the chain of WCB control blocks.
  
  The hang occurs if a WCB forward pointer incorrectly
  addresses another WCB that has already been processed
  higher up in the chain.
  
  The corruption of the WCB forward pointer happens during
  INSTALL WEBSERVICE processing. It occurs if a task loses
  control, when swapping from the shared lock to the exclusive
  lock in DFHPIWR CREATE_WEBSERVICE, and a second task then
  alters the WCB chain.
  
  Additional keywords: RESOLVE_ALL_WEBSERVICES hang hung 0C4
                       S0C4 abend0C4 abend S0C4
  

Problem conclusion

• DFHPIWR create_webservice has been changed so the updating of
  the WCB forward pointer (pi_wsbctl_forward_ptr) is correctly
  done under the protection of the exclusive lock.
  

Temporary fix

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

Comments

APAR Information

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

  PM01465

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

  UK54041

Modules/Macros

• DESPIWR  DFHPIWR
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK54041

     UP10/02/11 P F002

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.