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  • 1.  kdb error

    Posted Tue October 21, 2025 08:22 AM

    Hi Guys,

    When I try to use kdb on one of my AIX system (7.1.5.2022) I get these messages.

    # echo "cvai" | kdb
    WARNING: Version mismatch between unix file and memory image
               START              END <name>
    0000000000001000 0000000005870000 _$STATIC+000400
    F00000002FF47600 F00000002FFDF9C8 __ublock+000000
    000000002FF22FF4 000000002FF22FF8 environ+000000
    000000002FF22FF8 000000002FF22FFC errno+000000
    F1000F0A00000000 F1000F0A10000000 pvproc+000000
    F1000F0A10000000 F1000F0A18000000 pvthread+000000
    Unable to establish context with current thread
    Unable to find kdb context
    [kdb_read_mem] no real storage @ F1000A0000365218
    <curthread> not found
    Unable to find kdb context
    [kdb_read_mem] no real storage @ F1000A0000365218
    <curthread> not found
    Unable to find kdb context
    (0)> cvai
    [kdb_hash_find] NULL table parameter
    <curthread> not found
    Unable to find kdb context

    If i use any other command than "cvai", I get the same messages.

    Thanks a lot for your help.



    ------------------------------
    Omar Khedim
    ------------------------------


  • 2.  RE: kdb error

    Posted Wed October 22, 2025 12:55 AM

    That usually means that the kernel loaded at last boot does not match /us/lib/boot/unix_64.

    A bosboot and reboot should fix it.

    Regards



    ------------------------------
    Chris Wickremasinghe
    IBM
    ------------------------------

    Original Message


  • 3.  RE: kdb error

    Posted Wed October 22, 2025 02:21 AM

    hi

    if you changed your AIX system name and it is reflected in HMC , then probably you need to reboot you AIX server , since this AIX LPAR name is written at LPAR kdb ( kernel attr)

    thank you



    ------------------------------
    Anas AlSaleh
    IBM Power Systems Software Specialist
    Saudi Business Machines ( SBM )
    Riyadh
    ------------------------------

    Original Message


  • 4.  RE: kdb error

    Posted Wed October 22, 2025 10:16 AM

    Hello Omar,

    This is usually caused by applying an AIX kernel fix/patch/update and not rebooting the system. The key message here is:

    WARNING: Version mismatch between unix file and memory image

    You can use the 'lslpp' and 'emgr' commands to see when the kernel was updated last:

    $ lslpp -h bos.mp64
      Fileset         Level     Action       Status       Date         Time
      ----------------------------------------------------------------------------
    Path: /usr/lib/objrepos
      bos.mp64
                      7.3.2.1   COMMIT       COMPLETE     07/25/24     15:02:13
                      7.3.2.3   APPLY        COMPLETE     07/25/24     16:46:57
                      7.3.3.0   APPLY        COMPLETE     01/17/25     09:51:17

    Path: /etc/objrepos
      bos.mp64
                      7.3.2.1   COMMIT       COMPLETE     07/25/24     15:02:19
                      7.3.2.3   APPLY        COMPLETE     07/25/24     16:47:05
                      7.3.3.0   APPLY        COMPLETE     01/17/25     09:51:34

    # emgr -l

    ID  STATE LABEL                INSTALL TIME      UPDATED BY ABSTRACT
    === ===== ==================== ================= ========== ======================================
    1    S    xxxxxx               01/17/25 09:57:31            ifix ...
    2    S    yyyyyy               01/17/25 09:57:44            ifix ...
    3    S    zzzzzz               03/25/25 13:22:22            POTENTIAL ...

    Then you can estimate the last boot time from the uptime command:

    $ uptime
     09:10:06  up 1 day  0:15,  9 users,  load average: 0.04, 0.03, 0.04

    If the system has not been booted since the kernel was update, then you need to reboot. 

    I would also suggest using the '-script' option with kdb to shorten the output:

    # echo "cvai" | kdb -script
    read vscsi_scsi_ptrs OK, ptr = 0xF10009D5B0129F00
    (0)> cvai
    Executing cvai command
    NAME       STATE    CMDS_ACTIVE  ACTIVE_QUEUE       HOST
    vscsi0     0x000007 0x0000000000 0x0                cedar-vios->vhost0

    End of execution for cvai command
    (0)> Executing q command

    This may reduce the verbosity of kdb.



    ------------------------------
    Grover Davidson
    ------------------------------

    Original Message


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