RE: [lkcd-devel] Lcrash fails ("not found in dump file")

[<man...@wi...>]

Hi Tom,

I am using lkcdutils-4.1 and kernel patches for 2.4.18 (manually applied
it on 2.4.26). lcrash works fine on a dump image. The problem happens
only when I move to an SMP box (2 xeon processors with 4GB of RAM) for
live debugging. I booted my desktop (Pentium) with the same kernel image
and modules and live debugging with lcrash works absolutely fine. So not
sure why its not able to load ksyms on the SMP box.

I am trying to debug it using gdb and will update if I can find out
something.


Thanks,
Manoj

-----Original Message-----
From: Tom Morano [mailto:tj...@sg...]=20
Sent: Thursday, March 31, 2005 8:32 PM
To: Manoj Sharma (WT01 - EMBEDDED & PRODUCT ENGINEERING SOLUTIONS)
Cc: lkc...@li...; Tom Morano
Subject: Re: [lkcd-devel] Lcrash fails ("not found in dump file")


Hi Manoj,

It kind of depends. Which version of lcrash (from the LKCD source tree)
are you using? Also, what is the architecture of your dump? I would not
think that the problem is with the kernel config if you were able to
generate the dump. The only 2.4.X testing I've done has been with SN2
ia64 systems. Dumps from these systems are somewhat different than dumps
from generic LKCD 2.4.x systems. That's because SGI had its own version
of LKCD and lcrash... The basic support for the 2.4.x kernel is there. I
have been working on the 7.X.X tree. Have you tried an lcrash from that
tree? Also, did you step through the lkcdutils init using gdb to see the
actual point of failure? The error message you are seeing is rather
vague and misleading (I admit).  You really need to walk to the point of
failure to see what's going on. If there is some way you can get me a
copy of the dump, I can take a look at it (assuming I can build an
lcrash for that arch). One other thing, does lcrash fail on the live
system, or just on a dump?

Thanks,

Tom

----- Original Message -----=20
From: <man...@wi...>
To: <lkc...@li...>
Cc: <man...@wi...>
Sent: Thursday, March 31, 2005 4:45 AM
Subject: [lkcd-devel] Lcrash fails ("not found in dump file")


> Hi,
>
> I am trying to do live debugging of a linux (2.4.26) bases system.=20
> When I run lcrash, it always fails saying "not found in dump file". It

> is not able to load ksyms from the memory. Can someone help me to=20
> resolve it, what can be the reasons for the failure ? Is there=20
> anything wrong with the kernel configuration or compilation ?
>
>
>
> Manoj
>
>
> The output of lcrash:
> <-----
> lcrash 0.9.2 (xlcrash) build at Sep 20 2004 17:13:46
> Lcrash is free software. It is covered by the GNU General Public=20
> License. You are welcome to change it and/or distribute copies of it=20
> under certain
> conditions. Type "help -C" to see the conditions. Absolutely no
warranty
> is given for Lcrash. Type "help -W" for warranty details.
>
>       map =3D /boot/System.map
>      dump =3D /dev/mem
> kerntypes =3D /boot/Kerntypes
>
>
> Please wait...
>         Check dump architecture:
> Warning: Unknown magic number in dump header.
> Warning: Unknown dump arch. Setting dump arch to host arch.
>         Init host arch specific data ... Done.
>         Init dump arch specific data ... Done.
>         Loading system map ... Done.
>         Set dump specific data ... Done.
>         Loading type info (Kerntypes) ... Done.
>         Loading ksyms from dump ... Failed.
>
> not found in dump file
>
> ---->
>
>
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