kexec/ kdump setup problem

[Mrunal Gawade]

Hi,

I just checked /sys/kernel/kexec_crash_loaded file after giving the kexec -p
command for loading panic kernel. And the value was 1. So it was loaded
successfully. I then crashed kernel and it hanged. I rebooted manually and
checked the value in the file again and it was "0". So across reboot it got
reset. So if I assume that the kernel loading was successful, the question
remains if it got loaded successfully at the designated space 65M at 16M. How
do I know that? I am running SUSE 2.6.25 on a VMWare workstation. Does
running on VM could change any thing such as memory layout or anything
related to panic handling?

You specified taking a look at the /sys/kernel/kexec_crash_loaded file. Is
there a central document which documents all these error resolving
guidelines? Also I checked in the /var/log/messages and there is no message
related to this printed over there.


Thank you,
Mrunal

On Tue, Apr 29, 2008 at 5:17 PM, Neil Horman <nhorman at redhat.com> wrote:

> On Tue, Apr 29, 2008 at 03:40:13PM -0700, Mrunal Gawade wrote:
> > Thanks Sachin.
> >
> > The value over there is a "0" which means I have a failure. How do I
> > diagnose what is the problem? I was able to load a normal kernel and
> then
> > use "e" option to reboot into it. But crash dump kernel seemed to be
> giving
> > problem always.
> >
> >
> > Thank you,
> > Mrunal
> >
>
> check /var/log/messages, to see if there is any message there.  It
> wouldn't hurt
> to enable debugging in the kexec binary either, although if the load is
> actually
> failing, I would think you would get something on stderr.  First guess
> would be
> that you don't have a crashkernel area specified on your command line (or
> you
> do, and its reservation failed, which also will show up in the logs most
> likely)
>
> Neil
>
> > On Tue, Apr 29, 2008 at 4:13 AM, Sachin P. Sant <sachinp at in.ibm.com>
> wrote:
> >
> > > Mrunal Gawade wrote:
> > >
> > > > After I execute this command. Should I expect any prompt that kernel
> > > > loaded successfully?
> > > >
> > > Check the /sys/kernel/kexec_crash_loaded file. Value "1" means
> success.
> > >
> > > Thanks
> > > -Sachin
> > >
> > >
>
> > _______________________________________________
> > kexec mailing list
> > kexec at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/kexec
>
>
> --
> /***************************************************
>  *Neil Horman
>  *Software Engineer
>  *Red Hat, Inc.
>  *nhorman at redhat.com
>  *gpg keyid: 1024D / 0x92A74FA1
>  *http://pgp.mit.edu
>  ***************************************************/
>
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