Re: Dump debugging without "crash"

From: Justin Bleistein (justin.bleistein_at_TOWERSPERRIN.COM)
Date: 05/26/05

  • Next message: Green, Simon: "Re: Dump debugging without "crash"" 
    Date:         Thu, 26 May 2005 07:48:24 -0400
To: aix-l@Princeton.EDU

    Yes, that will work. If you have the: "/unix"/kernel file which was on the
    system when it crashed. All you have to do it restore it off of the
    "mksysb" to a different file name an invoke crash with the following:
    "crash core_lv_or_file_name /file_name". By default, if you enter crash
    without any kernel
    file specification it goes for: "/unix".

            Some tips. When you start looking into the crash, do a; "stat" to
    see if it's valid. Then do a: "trace -m". This will give you the stack
    traceback.
    The first/top function/sub-routine listed was the last one which was
    running when the system crashed. This should be the IAR call. Then take
    the number
    in the parenthesis next to it/hex usually, and run: "le number". That
    should tell you what device driver/module/extension caused the crash.
    Usually when
    that's the cause, you do an: "lslpp -w device_driver_filename" - usually
    "/usr/lib/drivers/file_name", and upgrade that fileset/lpp to the latest
    level. That's if
    the crash was caused by a device driver.

    Thanks.

    --Justin Richard Bleistein
    AIX Systems Administrator

    "Green, Simon" <Simon.Green@EU.ALTRIA.COM>
    Sent by: IBM AIX Discussion List <aix-l@Princeton.EDU>
    05/26/2005 07:30 AM
    Please respond to
    IBM AIX Discussion List <aix-l@Princeton.EDU>

    To
    aix-l@Princeton.EDU
    cc

    Subject
    Re: Dump debugging without "crash"

    I tried kdb, and it's got the same problem as "crash".
     
    If I knew enough about the AIX internals I guess I could just look at the
    raw data - I used to be able to do that for MVS systems, many moons ago -
    but I don't, so I can't.
     
     
    I do still have a mksysb taken before I started work. Could I restore
    /unix from that (to some other name, of course!) then use that as input to
    the kdb command? e.g. kdb /dev/hd7 /old_unix
     
    If I can find the time I might give that a try.
      

    -- 
Simon Green  
Altria ITSC Europe s.a.r.l.
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-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of 
Justin Bleistein
Sent: 26 May 2005 12:13
To: aix-l@Princeton.EDU
Subject: Re: Dump debugging without "crash"
Unfortunately, I don't think so. It needs the correct kernel file to 
resolve symbols and to have a consistent state of the system at the time 
of 
the crash. If there is a way, I'd really like to know. I ran into that 
once before as well. Because of it I never knew the cause of a system 
crash. 
        Also, this may be worth it. "kdb" actually existed in some later 
levels of 4.3.3. Go ahead and try it on that. I highly doubt it though. 
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  • Next message: Green, Simon: "Re: Dump debugging without "crash""

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