PI15612: INTERNAL BUFFER CHAIN CAN BE BROKEN BY CONCURRENT ONLINE UPDATES

APAR status

• Closed as program error.

Error description

• There is a vulnerability in logic that serializes concurrent
  accesses to internal message buffers from multiple processes,
  which can break the internal buffer chain when a high volume of
  online updates are made concurrently on multiple IMS subsystems
  during reorganization.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IMS Online Reorg Facility V1.3      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Internal buffer chain can be broken by  *
  *                      concurrent online updates               *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  There is a loophole in a logic that serializes the concurrent
  accesses to internal message buffers from multiple processes,
  and it can break internal buffer chain when concentrative online
  updates are made concurrently on multiple IMS subsystems during
  reorganization.
  

Problem conclusion

• This APAR modifies the program that manages internal message
  buffers to be safe for concurrent access by multiple processes.
  

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:

  UI17197

Modules/Macros

• HRFOLEV0 HRFOXCF
  

Fix information

• Fixed component name

  IMS ONLINE REOR

• Fixed component ID

  5655H9700

Applicable component levels

• R130 PSY UI17197

     UP14/04/22 P F404