PH31763: ABEND 0C4-00000038 IN DSNSVSFB+00474 AFTER APPLYING PTF UI72510 20/11/17 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABND=0C4-00000038 OCCURS IN DSNSVSFB AT OFFSET 00474
  AFTER APPLYING PTF UI72510 FOR APAR PH30872
  ABEND OCCURS WHEN 2 THREADS REQUEST STORAGE FROM SAME POOL
  AT SAME TIME. STORAGE IS OBTAINED WHILE OTHER THREAD IS
  PERFOMING VALIDITY CHECKING.
  

Local fix

• REMOVE PTF UI72510, RECYCLE DB2
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of Db2 12 z/OS with                                *
  * PH30872 / UI72510 applied.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ABEND0C4 00000038 can occur in                               *
  * DSNSVSFB OFFSET00474 when                                    *
  * multiple concurrent threads request                          *
  * for storage on the same Db2 managed                          *
  * pool at the same time with                                   *
  * PH30872 / UI72510 applied.                                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply corrective PTF when available                          *
  ****************************************************************
  Multiple concurrent threads requested storage on the same Db2
  managed pool at the same time. The winner of the request had
  started to update the storage it got from the free chain.
  However, with PH30872 / UI72510 applied, the other remaining
  concurrent thread(s) was still doing validity checking on the
  same storage.
  As a result, the thread(s) that was still doing validity
  checking encountered the aforementioned abend as the
  information needed by Db2 Storage Manager was already updated
  when the first thread successfully got the same storage.
  

Problem conclusion

• Db2 was modified to do the validity checking after
  serialization on the free chain. If the storage gotten from
  the free chain is determined to be broken, ABEND04E 00E2000E
  will be issued, as well as an attempt to self correct the
  free chain.
  

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:

  UI73438

Modules/Macros

• DSNSVSFB
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RC10 PSY UI73438

     UP21/01/20 P F101 ­

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.