OA61643: DB2 WILL NOT SHUTDOWN WITH AN ALLIED AGENT SUSPENDED IN RRS ON END CONTEXT SYNCPOINT REQUEST

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An allied agent is hung in task termination due to a suspend in
  RRS waiting to be resumed after the completion of an End Context
  syncpoint associated with the terminating contexts. This request
  was queued under the Context Services end of task resource
  manager, CTXRSMGR. In the timeframe of the End Context
  syncpoint, this asid was suffering from an out of storage issues
  with ABEND878 RC0C. As a result, when RRS scheduled SRB ATRBMSTC
  to resume the requestor, it failed on a STORAGE OBTAIN for
  x'8000' bytes in SP229 for a RUCA on entry and the RESUME was
  never performed. This then resulted in a hang of the allied
  agent address space and prevented Db2 from completing a normal
  shutdown.
  
  VERIFICATION STEPS:
  1) Verify in a svcdump of the allied agent address space that
  there is a suspend in RRS under a TCB that is abend processing
  (TCBCMP not equal to zeroes)
  2) Verify there is an outstanding RRS SQE to process End Context
  syncpoint associated with the terminating context
  3) Verify ABEND878 RC0C were occurring in same timeframe in this
  asid
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users at HBB77D0 and above                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: RRS unit of work resume processing      *
  *                      can experience 878 abends when the      *
  *                      resource manager address space is       *
  *                      memory constrained.  This can lead      *
  *                      to hangs in processing.                 *
  ****************************************************************
  During processing to resume a unit of work, RRS will attempt to
  obtain 32K of memory in the RM address space.  This can result
  in 878 abends and hangs.
  

Problem conclusion

• During processing to resume a unit of work, RRS will first
  attempt to obtain the normal amount of memory.  If this fails
  a minimal memory obtain will be performed to attempt to resume
  the unit of work.
  

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:

  UJ97957 UJ97958 UJ97959

Modules/Macros

• ATRBMSTC
  

Fix information

• Fixed component name

  RESOURCE RECOVE

• Fixed component ID

  5752SCRRS

Applicable component levels

• R7D0 PSY UJ97957

     UP25/09/17 P F509

• R7E0 PSY UJ97958

     UP25/09/17 P F509

• R7F0 PSY UJ97959

     UP25/09/17 P F509

Fix is available

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