[PATCH 0/2] vmcoreinfo support for dump filtering #2

Randy Dunlap rdunlap at xenotime.net
Mon Sep 10 14:35:21 EDT 2007

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.
> [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.

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?

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).

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