PK84749: RAS: IMS FORMATTING FOR A SYSMDUMP GETS ERRORS WHEN TRYING TO FORMAT FIELDS FROM THE SDWA

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer prefers to use SYSMDUMPs to diagnose their IMS
  abends.  They set FMTO=T in order to get this type of dump.
    When using the IMS panels to get diagnostic information, they
  get MSGDFS3937I UNABLE TO ACCESS STORAGE WHILE FORMATTING THE
  DIAGNOSTIC AREA REQUESTED STORAGE: ADDR=007A6808, ASID=0039,
  LENGTH=00000020 (when using the SUMMARY option) and DFS3937I
  UNABLE TO ACCESS STORAGE WHILE FORMATTING THE AUTO OPTION PROC
  REQUESTED STORAGE: ADDR=00F8C000, ASID=0039, LENGTH=00000048
  (when using the AUTO option).
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V10 users using the SYSMDUMP DD      *
  *                 and option FMTO=T to produce a SYSMDUMP      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Various IMS termination problems result *
  *                      in incomplete dumps when using SYSMDUMP *
  *                      which causes IMS Dump Formatter errors. *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  Customer experienced multiple MSGDFS3937I while processing IMS
  dump produced by SYSMDUMP. The DFS3937I message is issued when
  there is a dump storage access error. Some dump storage access
  errors are the result of an incomplete dump. Others are caused
  by the method that is used to identify and locate the SDWA for
  a dump produced by SYSMDUMP.
  
  Several IMS abnormal termination problems have been identified
  which result in an incomplete dump when using SYSMDUMP.  These
  are:
  
  DFSSDL20 - The common TCB ETXR exit routine in DFSSDL20, the
             DLI-SAS Region Attach/ETXR Processor, was changed
             by PTM KWS0009 in IMS 7.1 as a result of FIN APAR
             PN92111 to address a DLI region abend termination
             error.  The change introduced code which used the
             high-order bit of the stored DLI TCB addresses as
             a flag bit.
  
             These addresses are passed unchanged to the MVS
             DETACH service to terminate the non-abending DLI
             TCBs when the DLI address space is abending.
  
             Passing a TCB address with the h/o bit set causes
             the DETACH service to abend.  In this case, since
             DLI is already in an RTM process, the DETACH abend
             is silent.  No messages or other indicators can be
             seen except that the abend interrupts the SYSMDUMP
             in-progress resulting in a partial dump.
  
             This will happen when the original abend is in the
             control region or in the DBRC region.
  
  DFSFSTM0 - Module DFSFSTM0, the control region STM Processor
             (E)STAE Exit Routine, has no facility to wait for
             the DBRC address space to complete termination as
             it does for the DLI address space. If the control
             region ends prior to SYSMDUMP capturing essential
             data, the Dump Formatter can not process the dump.
  
             This will happen when the original abend is in the
             control region or in the DLI region.
  
  DFSXRID0 - The DBRC ESTAE exit in DFSXRID0, the DBRC region
             initialization module, bypasses a call to DFSFDMP0
             for all abnormal sign-off requests - a U0150 abend.
             In the case of SYSMDUMP, where there is a separate
             dump created for each IMS address space, bypassing
             DFSFDMP0 results in missing SDWA SETRP data.
  
  There are also several problems in the IMS Dump Formatter that
  result in errors and incorrect output when processing any dump
  produced by SYSMDUMP.  These are:
  
  DFSAACI0 - DFSAACI0, the IMS Dump Formatter Init Panel Driver
             initialization CLIST, attempts to use the SCDDSDWA
             and SCDDASID fields from the SCD for the dump SDWA
             address and ASID value, respectively.
  
             This methodology works for an SVC dump, when there
             is a single, consolidated dump for all IMS address
             spaces, but does not work when there are multiple
             dumps, from multiple address spaces, which is the
             case for SYSMDUMP.
  
  DFSOFMD0 - DFSOFMD0, the IMS Dump Formatter Offline Formatted
             Dump Initialization module, also uses the SCDDSDWA
             and SCDDASID fields from the SCD for the dump SDWA
             address and ASID value, respectively.
  
             This methodology works for an SVC dump, when there
             is a single, consolidated dump for all IMS address
             spaces, but does not work when there are multiple
             dumps, from multiple address spaces, which is the
             case for SYSMDUMP.
  
  DFSABLF0 - DFSABLF0, the IMS Dump Formatter Symptom String
             Format Routine, does not check for control region
             storage being present in the dump.  The storage
             this module formats is only present in the control
             region.  When a separate SYSMDUMP is processed for
             either the DLI or DBR regions an extraneous and
             confusing DFS3937I message is generated because
             the required control region storage area is not
             available.
  
  DFSAUTO0 - DFSAUTO0, the Auto Option Processor, produces an
             extraneous MSGDFS3937I when attempting to access
             the SAP because the CTL region ASID is hard-coded
             on the call to the access service.  The CTL ASID
             is not necessary for SVC dumps and incorrect for
             SYSMDUMP.
  
  ADDITIONAL PROBLEMS:
  
  DFSABND0, IMS Dump Formatter Online Dump Format Initialization
  module, inserts an incorrect region mnemonic value in the dump
  report title because it checks the wrong flag for the presence
  of CTL, DLI, or DBR region storage in the dump.
  
  DFSFDMP0, the IMS Offline Dump Assist Module, copies the abend
  SDWA into an internal area in the case of SYSMDUMP which is no
  longer needed.
  

Problem conclusion

• GEN:
  KEYWORDS:
   IMSSERV
  
  *** END IMS KEYWORDS ***
  The following changes have been made to address problems when
  processing a SYSMDUMP:
  
  DFSAACI0 - Updated to use the SDWA address and ASID value
             from the dump header when processing a SYSMDUMP
  
  DFSABLF0 - Updated to check for the presence of the control
             region in the dump and to bypass processing, and
             avoid error messages, if not present
  
  DFSABND0 - Updated to use the correct flags when checking
             for an IMS region's storage being included in a
             dump, so that the correct mnemonic is inserted
             into the dump report title when processing a
             SYSMDUMP:
  
               CTL for control region
               DLI for DLI-SAS region
               DBR for DBRC region
               UNK for UNKNOWN region
  
  DFSAUTO0 - Updated to remove hard-coded CTL ASID on access
             call for SAP
  
  DFSFDMP0 - Updated to remove SCDDSDWA update and SDWA (R10)
             reset when processing SYSMDUMP SDWA copy. Copied
             SDWA is no longer referenced or used.
  
  DFSFSTM0 - Conditional wait added after DBRC sign-off call
             to allow SYSMDUMP to take place.  Only used
             when SYSMDUMP and abend is not in DBRC itself.
  
  DFSOFMD0 - Updated to use the SDWA address and ASID value
             from the dump header when processing a SYSMDUMP
             and to set CAFMSYSM flag for same
  
  DFSSDL20 - Updated to reset the TCB address passed to the
             DETACH service so as not to have the h/o bit on
  
  DFSXRID0 - Updated to call DFSFDMP0 for SETRP's if U0150
             and SYSMDUMP
  
  ICADSECT - Updated to add CAFMSYSM flag, processing SYSMDUMP,
             for IMS Dump Formatter use
  
  ADDITIONAL KEYWORDS:
  U150 U0150 ABENDU150 ABENDU0150
  DFS1193I MSGDFS1193I
  

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:

  PK98651 UK56353

Modules/Macros

• DFSAACI0 DFSABLF0 DFSABND0 DFSAUTO0 DFSFDMP0
  DFSFSTM0 DFSOFMD0 DFSSDL20 DFSXRID0 ICADSECT
  

Fix information

• Fixed component name

  IMS V10

• Fixed component ID

  5635A0100

Applicable component levels

• R010 PSY UK56353

     UP10/04/29 P F004

Fix is available

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