PI57890: 5C6-00C5105B,U=SYSOPR ,C=R3600.710.CFM LOC=CSQELPLM.CSQEDSS2 LEADING TO ABNORMAL QUEUE MANAGER TERMINATION REASON=00C510AB

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Abend 5C6-00C5105B in CSQEDSS2 occurs during structure recovery,
  leading to abnormal queue manager termination REASON=00C510AB
  DUMP TITLE=CSQ1,ABN=5C6-00C5105B,U=SYSOPR  ,C=R3600.710.CFM -CS
     562
  QEDSS2,M=CSQGFRCV,LOC=CSQELPLM.CSQEDSS2
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Various problems occur following admin  *
  *                      structure failure during queue manager  *
  *                      restart and subsequent application      *
  *                      structure failure.                      *
  *                      When the application structure is       *
  *                      recovered symptoms can include:         *
  *                       - missing messages on shared queues    *
  *                         using the structure                  *
  *                       - messages unexpectedly rolled back    *
  *                         to shared queues using the structure *
  *                      In addition, if messages are being      *
  *                      stored on the structure using SMDS the  *
  *                      following symptoms can also occur:      *
  *                       - 5C6-00C94522 in CSQIMGES when        *
  *                         getting messages from queues on the  *
  *                         the structure                        *
  *                       - 5C6-00C5105B in CSQEDSS2 during      *
  *                         recovery of the structure, followed  *
  *                         by abnormal queue manager            *
  *                         termination with REASON=00C510AB     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During queue manager startup, CSQERADM connected to the admin
  structure and attempted to determine if any recovery was
  required for this queue manager's state as held in the admin
  structure. While this processing was occurring the admin
  structure failed, causing CSQERADM to exit before initialising
  the eSTIM (structure interest map). When the structure was
  automatically recovered, CSQERAD2 rebuilt the queue managers
  state and wrote it into the admin structure, however because the
  eSTIM was not initialised, an incorrect eSTIM was written to the
  admin structure.
  When an application structure subsequently failed and was
  recovered by another queue manager, the queue manager performing
  the structure recovery read the eSTIM from the admin structure
  and used it to determine which queue manager's logs were
  required for the recovery. However the incorrect eSTIM for the
  initial queue manager meant that the logs for that queue
  manager were not read and logged operations from that queue
  manager that affected the structure (e.g. MQPUT and MQGET
  requests for persistent messages on shared queues held in that
  structure) were not replayed, leading to the contents of queues
  on the recovered structure being incorrect.
  In cases where SMDS is used, this incorrect state on the queues
  can lead to multiple messages attempting to reference the same
   SMDS blocks - this is detected when getting the messages
  or when the SMDS spacemap is rebuilt during recovery, leading
  to the 5C6 abends and subsequent queue manager termination.
  

Problem conclusion

• CSQERADM is changed to always initialise the eSTIM, even if the
  admin structure has failed since CSQERADM connected to it.
  If the structure failure prevents CSQERADM writing the eSTIM to
  the structure, CSQERAD2 will write the initialised control block
  when the structure is available.
  
  MQSMDS/K
  100Y
  CSQERADM
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UI36952

Modules/Macros

• CSQERADM
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI36952

     UP16/05/04 P F605 ¢

Fix is available

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