PI24063: AFTER A BROKER FLOW RUNS FOR SOME TIME IT FAILS WITH "MQ ERROR CREATING A MESSAGE HANDLE - MQ REASON CODE - 2127"

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A broker flow fails with "MQ error creating a Message Handle -
  MQ Reason code - 2127" followed by "java.lang.OutOfMemoryError:
  Failed to create a thread: retVal -1073741830, errno 112" after
  which all instances fail with an out-of-memory error.
  .
  Change Team determined storage has filled with a large number
  of 128Kb blocks (with eyecatcher AHSG) related to MQ message
  handle processing. WebSphere MQ has stopped tracking these and
  not released them back to z/OS.
  .
  Additional keywords:
  MQRC_ADAPTER_STORAGE_SHORTAGE MQMSGPROP/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 0 Modification 1.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Long-running application that uses      *
  *                      message handles fails with reason code  *
  *                      2127 MQRC_ADAPTER_STORAGE_SHORTAGE.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A long-running application issues MQCRTMH several times and uses
  a large amount of heap storage for message handles. When the
  application issues a MQDLTMH, only the first block of message
  handle storage is released.
  The routine free_all_stg in CSQAFRMN is not following the chain
  of message handle storage correctly and therefore does not free
  all the blocks.
  If this occurs many times, storage is used up and the
  application will get reason code 2127
  MQRC_ADAPTER_STORAGE_SHORTAGE.
  Additional Keywords: MQMSGPROP/K
  

Problem conclusion

• CSQAFRMN has been altered to run down the chain of blocks and
  free them all.
  010Y
  CSQAFRMN
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PI09766

• APAR is sysrouted TO one or more of the following:

  UI33395

Modules/Macros

• CSQAFRMN
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UI33395

     UP16/01/08 P F601

Fix is available

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