IBM Support

IT15705: WEBSPHERE MQ: ABNORMALLY HIGH CPU USAGE IN AMQRMPPA PROCESS.

A fix is available

IBM MQ for HP NonStop Server V8.1 Fix Pack 8.1.0.6

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APAR status

  • Closed as program error.

Error description

  • The CPU usage of amqrmppa process increases suddenly while mq
activities have not changed.

The MQ trace file shows these lines repeated
indefinitely.


 ----{  lpiSPICloseScratchPad
  Hobj(4)
 -----{  zstGetPCD
 ------{  zstVerifyPCD
 ------}  zstVerifyPCD rc=OK
 -----}  zstGetPCD rc=OK
 -----{  ziiBreakConnection
 -----}  ziiBreakConnection rc=OK
 ----}! lpiSPICloseScratchPad rc=MQRC_CONNECTION_BROKEN
 ----{  rrxError
  RetCode = 20009590, rc1 = 2009, rc2 = 0,
          Comment1 = '', Comment2 = '',
          Comment3= 'AIX                                   ',
          File= '/build/slot1/p750_P/src/lib/remote/amqrsyna.c',
          Line= '1382'
 ----}! rrxError rc=rrcE_CLOSE_SCRATCHPAD_FAILED

Local fix

  • 



Problem summary


    

  • ****************************************************************
USERS AFFECTED:
All users of IBM MQ.


Platforms affected:
MultiPlatform

****************************************************************
PROBLEM DESCRIPTION:
A coding error meant that the IBM MQ channel agent process
(amqrmppa) had the potential to enter an infinite loop during
channel initialization.

    



Problem conclusion


    

  • The IBM MQ queue manager code has been changed to prevent the
possibility of an inifinite loop.

---------------------------------------------------------------
The fix is targeted for delivery in the following PTFs:

Version    Maintenance Level
v7.5       7.5.0.8
v8.0       8.0.0.6

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 number
    IT15705
    • 

  • Reported component name
    WMQ BASE MULTIP
    • 

  • Reported component ID
    5724H7241
    • 

  • Reported release
    750
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2016-06-14
    • 

  • Closed date
    2016-07-28
    • 

  • Last modified date
    2017-03-10
    • 





    

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

    • 

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

    
IT33903
    

    • 



Fix information


    

  • Fixed component name
    WMQ BASE MULTIP
    • 

  • Fixed component ID
    5724H7241
    • 



Applicable component levels


    

  • R750  PSY
       UP
    • 








      
              
                            

              

              [{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.5"}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            26 August 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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