IT42322: Native HA queue manager generates FDC with probe ID HL199020 hrcE_UNEXPECTED_ERROR

APAR status

• Closed as program error.

Error description

• A failure data capture (FDC) record is generated by a native HA
  queue manager, similar to the following:
  
  | Probe Id          :- HL199020
                                                |
  | Application Name  :- MQM
                                                     |
  | Component         :- mqlReadOnly
                                             |
  | Source filename   :-
  /build/jslot1/p930_P/src/lib/logger/amqhrlg0.c         |
  | Line Number       :- 1055
                                                    |
  | Build Date        :- Sep 21 2022
                                             |
  | Build Level       :- p931-L220921.3
                                          |
  | Build Type        :- IKAP - (Production)
                                     |
  | Effective UserID  :- 231 (mqm)
                                               |
  | Real UserID       :- 11130 (ats)
                                             |
  | Program Name      :- amqzxma0
                                                |
  | Arguments         :- -m CAA02 -u ats
                                         |
  | Standard Streams  :- 0 1 2
                                                   |
  | Addressing mode   :- 64-bit
                                                  |
  | LANG              :- en_GB.UTF-8
                                             |
  | Process           :- 56282
                                                   |
  | Process(Thread)   :- 56320
                                                   |
  | Thread            :- 15
                                                      |
  | Thread Name       :- NativeHAReplay
                                          |
  | SubpoolName       :- CAA02
                                                   |
  | Instance Name     :- nha_qm1.2
                                               |
  | Perf Counter      :- 19019156726791440
                                       |
  | UserApp           :- FALSE
                                                   |
  | ConnId(2) QM      :- 28
                                                      |
  | Last HQC          :- 2.0.0-4402944
                                           |
  | Last HSHMEMB      :- 2.16.20-1933440
                                         |
  | Last ObjectName   :-
                                                         |
  | Major Errorcode   :- hrcE_UNEXPECTED_ERROR
                                   |
  | Minor Errorcode   :- OK
                                                      |
  | Probe Type        :- INCORROUT
                                               |
  | Probe Severity    :- 2
                                                       |
  | Probe Description :- AMQ6125E: An internal IBM MQ error has
  occurred.       |
  | FDCSequenceNumber :- 0
                                                       |
  |
                |
  +---------------------------------------------------------------
  --------------+
  
  MQM Function Stack
  zxcTaskReply
  zxcNativeHAReplay
  apiStartup
  almPerformReDoPass
  hlgScanLogRecord
  mqlReadLogRecord
  mqlReadOnly
  xcsFFST
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of IBM MQ Native HA functionality
  
  
  Platforms affected:
  Linux on x86-64, Linux on S390, Linux on Power
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error existed whereby a native HA queue manager could
  incorrectly calculate the position of the previous log record
  written. A theoretical timing window exists at this point
  whereby the log record could be partially overwritten.
  
  Such data loss has not been observed outside of lab conditions.
  

Problem conclusion

• The IBM MQ native HA log handling logic has been updated to
  correctly track the position of the previous log record.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.3 LTS   9.3.0.5
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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:

Fix information

• Fixed component name

  MQ BASE V9.3

• Fixed component ID

  5724H7291

Applicable component levels