PH16610: DSNB1AEX ABEND0C4 PIC38 DUE TO INCORRECT MEDIA MANAGER REQUEST BLOCK ADDRESS AFTER CANCEL ABENDS0222 WITH MM ERROR CODE 0034011

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The dump taken for DSNB1AEX+00202 UI51499 0c4 pic38 at
  08/22/2019 14:22:23.559420 Local shows incorect
  MMRBWMRB=0000000000000001 address in MMRBW at 7D3B48B0, after
  cancel abends0222 with the error code 00340114 (indicating
  (0034) i/o started, 01=ICYRDWR, 14 = indeterminate error) in
  ICYRDWR UA97683 + 1826 during i/o in progress. It appears that
  MMRBWMRB would not have been correctly set. I/O Caller is
  DSN5COM PRR.
  Additional Keyword:
  ZSA45
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All Db2 12 for z/OS users.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ABEND0C4=0C4-00000038,                                       *
  * LOC=DSNIDM .DSNB1AEX+00202                                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply corrective PTF when available                          *
  ****************************************************************
  ABEND 0C4-00000038 may occur in DSNIDM .DSNB1AEX OFFSET00202
  when a cancel occurs in Media Manager during a synchronous
  write I/O. This is because an invalid 64-bit MMRE pointer was
  used for the started MMRB chain in Db2's buffer manager I/O
  recovery routine. It eventually resulted in the abend
  mentioned above.
  

Problem conclusion

• Db2 code has been modified to use the correct MMRE pointer when
  a cancel hits in Media Manager during a synchronous write I/O.
  

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:

  UI68720

Modules/Macros

• DSNB1IOR
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RC10 PSY UI68720

     UP20/04/08 P F004 ¢

Fix is available

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