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OA61077: Users X-clocked after entering userd & password Lock contention potentially hangs user logon in addition

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APAR status

  • Closed as program error.

Error description

  • Performance improvement

Abstract: Lock performance improvement

Description: Lock contention potentially hangs user logon

Local solution: n/a

Resolution: Locking has been improved to eliminate contention

OA61077 represents a significant performance improvement for
V210 but also a small functional change.


Dialog lock initialization was moved from 'first use' to 'at
product startup' to minimize a potential lock contention that
hung the system. The effect should be transparent.

KLSOPTMT is deprecated. KLSOPTMT tracked dialog use, the
overhead of which was significant and the payback minimal. The
replacement function has been ported from V310 and works like
this:
Rather than log *executed dialog maintenance at shutdown, *all
dialog maintenance is reported at startup. The deprecated
command:  NTD KLSMLEV ???  which is no longer relevant, instead
invokes the aforementioned startup maintenance list in the event
an on-demand list is necessary (e.g., if the entire TLVLOG is
unavailable).

NOTE:

Example of an Execution thread:


WAIT  $TCB 26CFA648  SIZE 0000003C  PCB 00000000  DQA 0000D0C0
LSA 2822CC00  FRB 00000000
  $LSA 26CFA8F8  LFFS 00000270  PREV 00000000  NEXT A6CFA8A0
R14 800460FC = KLKWAIT+05EC
      R15 80000008 = PSA+08  R0 00017740 = KLGASDLG+0140  R1
002418AB
  $LSA A6CFA8A0  LFFS 00000218  PREV 26CFA8F8  NEXT A6CFA810
R14 80017878 = KLGASDLG+0278
      R15 00000000 = PSA  R0 26D8D6F5 = FSA+0CAC0D  R1 00000000
= PSA
  $LSA A6CFA810  LFFS 00000188  PREV A6CFA8A0  NEXT 27FE0848
R14 A6C3CE02 = KLK$DM+0A52
      R15 26D8D128 = FSA+0CA640  R0 26DCD209 = FSA+10A721  R1
27FE0848 = FSA+0131DD60
  $LSA 27FE0848  LFFS 00000000  PREV A6CFA810  NEXT 272D8608
R14 A6C22B1E = KLJDFENT+0536
      R15 00000029 = PSA+29  R0 26C22ADC = KLJDFENT+04F4  R1
27FE094C = FSA+0131DE64
  $LSA 272D8608  LFFS 00000270  PREV 27FE0848  NEXT 2AD49C38
R14 A6C3CE02 = KLK$DM+0A52
      R15 0000000C = PSA+0C  R0 26E26E9C = FSA+1643B4  R1
2AD49C38 = FSA+04087150
**************************************

  $LSA 2AD49C38  LFFS 00000000  PREV 272D8608  NEXT 2822CC00
R14 A6CBF9C0 = KLSDFSTK+01F8    <***********SEE NOTE BELOW
      R15 26D87A80 = FSA+0C4F98  R0 2AD49C38 = FSA+04087150  R1
A6DB39CC = FSA+0F0EE4

***************************************
  $LSA 2822CC00  LFFS 000002A8  PREV 2AD49C38  NEXT 00000000
R14 A6C8A5EA = KLKLIM+02F2
      R15 26D87A80 = FSA+0C4F98  R0 A822CC54 = FSA+0156A16C  R1
A6DB39CC = FSA+0F0EE4


NOTE: KLSDFSTK IS HOLDING A HIGH PRIORITY LOCK CAUSING ALL
USERS TO HANG AT LOGON.

Local fix

  • NONE.  To work around this issue apply the PTF and bounce CLSS.

Problem summary

  • ****************************************************************
* USERS AFFECTED: Users of IBM CL/SuperSession 210             *
****************************************************************
* PROBLEM DESCRIPTION: Lock performance improvement            *
****************************************************************
* RECOMMENDATION: Apply the PTF                                *
****************************************************************
Lock contention potentially hangs user logon

Problem conclusion

  • Locking has been improved to eliminate contention

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    OA61077
    • 

  • Reported component name
    CL/SUPERSESSION
    • 

  • Reported component ID
    5601B2800
    • 

  • Reported release
    210
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    YesHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2021-03-23
    • 

  • Closed date
    2021-04-13
    • 

  • Last modified date
    2021-10-28
    • 





    

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

    
OA61031
    

    • 

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

    
UJ05271
    

    • 



Modules/Macros


    

  • KLGINGWY KLGMAINT KLHDLOGR KLSACS   KLSCKFIX KLSDFSTK KLSINVAL
KLSLOGDQ KLSLULCP KLSMAINT KLSMIGR  KLSMLEV  KLSOPTMT KLSSDEXT
KLSSOPTC KLSTSCKS KLSTSDCA KLSTSDLG KLSTSSTK

    



Fix information


    

  • Fixed component name
    CL/SUPERSESSION
    • 

  • Fixed component ID
    5601B2800
    • 



Applicable component levels


    

  • R210  PSY  UJ05271
       UP21/04/20  P  F104  ¢
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
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              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M"},"Platform":[{"code":"PF054","label":"z\/OS"}],"Version":"210"}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            29 October 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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