IT28370: MQ Appliance reloads after enquiring the status of HA queue managers.

APAR status

• Closed as program error.

Error description

• The MQ appliance sometimes reloads when enquiring the status
  of HA queue managers on the MQ Console.
  The following steps can also lead to reload:
  1. Request the Queue Manager status using the REST API;
  2. Edit the configuration of the MQ Appliance using the web UI,
      at the same time as step 1.
  3. The web UI will show the loading animation until it times
       out.
  4. After approximately 120 seconds the MQ Appliance reloads
  
  The error-reports show that the reload is caused by a WATCHODG
  RESTART
  Thread 0x02971881: MQ00.9.1.0.1 Platform 9006 Task main Build
  304308mq
  on 2018/11/08 10:58:31
  Thread 0x02971881: 2019-01-30T14:48:50.265Z
  ...
  Thread 0x02971881: WATCHDOG RESTART is detected.
  Thread 0x02971881: Non-crash death_action: signum
  0x000000000000000c,
  si_code 0x00000000fffffffa, eip 0x00007f1778567a4d, si_addr
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All MQ Appliance users who use REST API or WebUI to query the HA
  queue manager statuses.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When the status to the HA queue managers were queried through
  REST API or web UI and if there was a delay in getting the
  response for the status inquiry then watchdog process marked the
  thread as hung, triggering a restart.
  

Problem conclusion

• The status check results in multiple internal commands being
  issued which individually may take longer to complete. In order
  to prevent the reload the timeout interval that determines how
  long to wait to receive a response from an internal command has
  been reduced.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 CD    9.1.4
  v9.1 LTS   9.1.0.4
  
  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

  IBM MQ APPL M20

• Fixed component ID

  5725Z0900

Applicable component levels