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IT20713: AT START-UP, DSMC AND/OR DSMTCA PROCESSES TAKE A LOT OF CPU RESOURCES ON ZLINUX WHEN PASSWORDACCESS GENERATE IS USED

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APAR status

  • Closed as program error.

Error description

  • A DB2 client backup looks to hang on a zLinux client machine.
    When that situation happens, a dsmtca process is looping and
    consuming a lot of CPU resources.
    
    This is due to a problem with the GSKIT for the zLinux client.
    This may also affect standard Backup/Archive client activities.
    In that case the high CPU usage is seen with the dsmc program.
    
    Tivoli Storage Manager and IBM Spectrum Protect Versions
    Affected:  v6.4 , v7.1 , v8.1 on zLinux client platform
    
    Customer/L2 Diagnostics:
    
    1.) Identify the PID of the dsmtca process using the following
        command: "ps aux |grep dsmtca"
        Check the one using a lot of CPU.
    2.) Run "gstack" against the PID identified in 1.)
    
    Example from  "gstack 22434" where 22434 is the pid of the
    looping dsmtca process:
    
      gstack 22434
    #0  0x000003ffe9632c3e in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #1  0x000003ffe963315e in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #2  0x000003ffe9633342 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #3  0x000003ffe963433e in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #4  0x000003ffe9633f40 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #5  0x000003ffe963505a in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #6  0x000003ffe9635172 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #7  0x000003ffe962c784 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #8  0x000003ffe962dbc2 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #9  0x000003ffe962de66 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #10 0x000003ffe9625c9a in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #11 0x000003ffe962861a in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #12 0x000003ffe9622d94 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #13 0x000003ffe9624784 in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    #14 0x000003ffe970b54c in ?? () from
    /usr/local/ibm/gsk8_64/lib64/N/icc/icclib/libicclib085.so
    
    
    Initial Impact: Medium
    
    Additional Keywords:  TSM S390 GSKIT 8872
    

Local fix

  • Switch from PASSWORDACCESS GENERATE  to PASSWORDACCESS PROMPT
    method in the dsm.sys file until a fix is available.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * IBM Spectrum Protect backup-archive client versions 7.1 and  *
    * 8.1 on Linux zSeries platform.                               *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See ERROR DESCRIPTION.                                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply fixing level when available. This problem is projected *
    * to be fixed in levels 7.1.8.2, 8.1.4.1 and 8.1.6. Note that  *
    * this is subject to change at the discretion of IBM.          *
    ****************************************************************
    *
    

Problem conclusion

  • The problem was due to an issue in GSKit library (GSKit ticket
    8872). The fix for both: FIPS and non-FIPS GSKit modes has been
    provided since GSKit version 8.0.50.86.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT20713

  • Reported component name

    TSM CLIENT

  • Reported component ID

    5698ISMCL

  • Reported release

    71L

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-05-23

  • Closed date

    2017-07-13

  • Last modified date

    2018-04-12

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

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

Modules/Macros

  • dsmtca   dsmc
    

Fix information

  • Fixed component name

    TSM CLIENT

  • Fixed component ID

    5698ISMCL

Applicable component levels



Document information

More support for: Tivoli Storage Manager

Software version: 71L

Reference #: IT20713

Modified date: 12 April 2018