PM55578: CICS REGION HANGS LOOPING READING TDQ WHEN PTF UK63439 FOR APAR PM24620 IS APPLIED. 12/01/09 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS start looping when reading TDQ.
  ADDITIONAL SYMPTOMS:
    DFHSM0133 applid CICS is under stress
  short on Storage above 16MB SOS ETDSA USXDPOOL.
  Getmained by DFHUSXM FUNCTION(INIT_TRANSACTION_USER)
  Two calls per transaction.  Only one is freed.
  Trace entry
  US 0402 DFHXUSM USDOM_TRANSACTION_TOKEN(16808E1F,1E8998D0)
  The second parameter is the Quickcell area in the subpool.
    In a dump, in the SM domain section,
  the USXDPOOL shows a large number of QPH
  (Quickcell Page Header)  control blocks.
  .
  Tight loop in DFHTFP label TFPC66. Processing a TCTTE chaining
  through the ownership chain at offset x'98' -field TCTTEUCN
  which points to itself, causing the tight loop.
  ADDITIONAL SYMPTOMS
  ABENDATNI ABEND ATNI DFHTFP TRANSACTION FAILURE PROGRAM
  AP 00DD TFP ENTRY TRANSACTION_ABENDED
  LOOP HIGH CPU TFPCHBP TCTTEUCN in a TCTTE points to itself
    It was set incorrectly at this trace entry:
  AP 05B0 TDXM DFHTDXM BIND_SECONDARY_FACILITY
  DFHTFBF BIND_FACILITY TFXM INIT_XM_CLIENT
  TFXM DFHTFXM INIT_XM_CLIENT
  should have never been called in the first place.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message DFHDU0004 'A possible loop has  *
  *                      been detected at offset X'FFFF' in      *
  *                      module DFHTCXDF' occurs when using TDQ. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A TD queue started task specifying a facility type of terminal,
  where the termid specified is a connection name, may result in
  msgDFHDU0004.
  

Problem conclusion

• DFHALP has been changed to call DFHXMAT ATTACH with STARTCODE
  QD and a facility type of terminal.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM52558

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

  UK78744

Modules/Macros

•    DFHALP   DFHMNXM  DFHXMTA
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R700 PSY UK78744

     UP12/05/19 P F205

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.