> Date: Wed, 26 Oct 2011 11:54:42 -0400
> From: anderson@redhat.com
> To: crash-utility@redhat.com
> Subject: Re: [Crash-utility] [help]crash can't anaylyse xen guest paravirtulized linux vmcore
>
>
>
> ----- Original Message -----
> >
> >
> > ----- Original Message -----
> > >
> > >
> > > SLES11:/opt/tar_rpm/crash-5.1.9 # ./crash -d8 /opt/kdump/vmlinux
> > > /opt/kdump/sles11_1.mem > /tmp/crash_output3
> > >
> > >
> > > output see attachement.
> > >
> > >
> > >
> > > Thank your response.
> >
> > It's been a long time since I've looked at the particulars of a Xen dumpfile
> > given that Red Hat has discontinued Xen for KVM, so I'm a bit rusty. In any
> > case, upon the first memory read, while trying to walk through the page table
> > data to resolve a kernel virtual address, it comes to a dead end. I have no
> > idea why, nor do I have any further suggestions.
> >
> > Can the SLES-qualified members of the list confirm that "xm dump" still creates
> > dumpfiles that crash can handle?
> >
> > Dave
>
> FWIW, it's actually making the second kernel virtual address read:
>
> $ grep pgd: crash_output3
> [ffffffff806f7360] pgd: 9af04067 mfn: 9af04 pgd_index: 1fe
> [ffffffff80674690] pgd: 9af04067 mfn: 9af04 pgd_index: 1fe
> $
>
> where, depending upon the kernel version, ffffffff806f7360 should
> be "end_pfn" or "max_pfn". It ended up resolving that first virtual
> address to a page table and page, but the data there doesn't make sense:
>
> $ grep "end pfn:" crash_output3
> end pfn: 0
> $
>
> So even though it appeared to work OK, it's apparently bogus.
>
> Then I believe that the second virtual address of ffffffff80674690
> should be "p2m_top", and while trying to walk the page tables for
> that virtual address, it failed.
>
> If you do this:
>
> $ nm -Bn vmlinux | grep -e ffffffff806f7360 -e ffffffff80674690
>
> you can at least verify that. But unfortunately it doesn't really
> help understand what's happening.
>
> Dave
>
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