IBM Support

IT36855: High memory utilization can occur in MQ channel processes if certificate renegotiation occurs many times

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APAR status

  • Closed as program error.

Error description

  • A queue manager running with TLS enabled may see significant
increase
in memory for the channel processes amqrmppa, runmqchl and
amqcrsta
over time.

Local fix

  • 



Problem summary


    

  • ****************************************************************
USERS AFFECTED:
Users using TLS enabled channels


Platforms affected:
MultiPlatform

****************************************************************
PROBLEM DESCRIPTION:
Excessive caching of historical validation data in the GSKit
cryptographic libraries used by MQ caused the process's memory
usage to increase over time if TLS renegotiations were
performed.

    



Problem conclusion


    

  • This issue is addressed by updating the level of the GSKit
cryptographic libraries in use by MQ to GSKit 8.0.55.23 or
later.

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

Version    Maintenance Level
v9.2 LTS   9.2.0.3
v9.x CD    9.2.3

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
    IT36855
    • 

  • Reported component name
    IBM MQ BASE MP
    • 

  • Reported component ID
    5724H7271
    • 

  • Reported release
    915
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2021-05-11
    • 

  • Closed date
    2021-07-02
    • 

  • Last modified date
    2021-07-08
    • 





    

  • 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 BASE MP
    • 

  • Fixed component ID
    5724H7271
    • 



Applicable component levels


    

  • R915  PSY
       UP
    • 








      
              
                            

              

              [{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"915"}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            16 July 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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