[Crash-utility] Re: [PATCH 0/2] vmcoreinfo support for dump filtering #2

[Vivek Goyal]

On Mon, Sep 10, 2007 at 11:35:21AM -0700, Randy Dunlap wrote:
> On Fri, 7 Sep 2007 17:57:46 +0900 Ken'ichi Ohmichi wrote:
> 
> > Hi,
> 
> > I released a new makedumpfile (version 1.2.0) with vmcoreinfo support.
> > I updated the patches for linux and kexec-tools.
> > 
> > PATCH SET:
> > [1/2] [linux-2.6.22] Add vmcoreinfo
> >   The patch is for linux-2.6.22.
> >   The patch adds the vmcoreinfo data. Its address and size are output
> >   to /sys/kernel/vmcoreinfo.
> > 
> > [2/2] [kexec-tools] Pass vmcoreinfo's address and size
> >   The patch is for kexec-tools-testing-20070330.
> >   (http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/)
> >   kexec command gets the address and size of the vmcoreinfo data from
> >   /sys/kernel/vmcoreinfo, and passes them to the second kernel through
> >   ELF header of /proc/vmcore. When the second kernel is booting, the
> >   kernel gets them from the ELF header and creates vmcoreinfo's PT_NOTE
> >   segment into /proc/vmcore.
> 
> Hi,
> When using the vmcoreinfo patches, what tool(s) are available for
> analyzing the vmcore (dump) file?  E.g., lkcd or crash or just gdb?
> 
> gdb works for me, but I tried to use crash (4.0-4.6 from
> http://people.redhat.com/anderson/) and crash complained:
> 
> crash: invalid kernel virtual address: 0  type: "cpu_pda entry"
> 
> Should crash work, or does it need to be modified?
> 

Hi Randy,

Crash should just work. It might broken on latest kernel. Copying it
to crash-utility mailing list. Dave will be able to tell us better.

> This is on a 2.6.23-rc3 kernel with vmcoreinfo patches and a dump file
> with -l 31 (dump level 31, omitting all possible pages).
> 

Thanks
Vivek