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PH06218: HANG WAIT WHEN MULTIPLE TASKS REQUESTING AN AMS SERVICE FIND THERE ARE NO AVAILABLE TASKS.

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APAR status

  • Closed as program error.

Error description

  • Batch job not getting cpu.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
*                 Release 1 Modification 0.                    *
****************************************************************
* PROBLEM DESCRIPTION: Applications using AMS hang when        *
*                      insufficient AMS worker tasks are       *
*                      available.                              *
****************************************************************
When an application accesses an AMS protected queue, requests
are passed to worker tasks in the AMSM address space. If no
tasks are available when a request is made, the request is
added to a chain for processing when a task becomes available,
either due to completing an inflight request, or due to a new
task being started.
An error in the chaining logic for some request types can lead
to those requests being incorrectly removed from the chain of
pending work. This results in those requests never being
processed, and the task requesting them remaining hung.

    



Problem conclusion


    

  • The chaining logic in CSQ0KRPT and CSQ0KRUP is changed to
prevent the requests being incorrectly dechained.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PH06218
    • 

  • Reported component name
    IBM MQ Z/OS V9
    • 

  • Reported component ID
    5655MQ900
    • 

  • Reported release
    010
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    YesHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2018-12-06
    • 

  • Closed date
    2019-05-13
    • 

  • Last modified date
    2019-07-01
    • 





    

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

    • 

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

    
UI62971
    

    • 



Modules/Macros


    

  • CSQ0KRPT CSQ0KRUP

    



Fix information


    

  • Fixed component name
    IBM MQ Z/OS V9
    • 

  • Fixed component ID
    5655MQ900
    • 



Applicable component levels


    

  • R100  PSY  UI62971
       UP19/06/06  P  F906  ¢
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
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              [{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"010","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            01 July 2019
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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