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    SubjectRe: Crash during vmcore_init
    On 11/17/2011 01:22 PM, Tim Hartrick wrote:

    > Tejun, Dave,
    >
    > I will be happy to answer any questions about our environment or test
    > debug or other patches. Just tell me what you need.


    Thank you. Can you share your kernel config?

    >
    > tim
    >
    > On Nov 16, 2011 8:44 PM, "Dave Young" <dyoung@redhat.com
    > <mailto:dyoung@redhat.com>> wrote:
    >
    > On 11/17/2011 12:34 PM, Tejun Heo wrote:
    >
    > > Hello,
    > >
    > > On Wed, Nov 16, 2011 at 7:30 PM, Dave Young <dyoung@redhat.com
    > <mailto:dyoung@redhat.com>> wrote:
    > >> This addr is converted to an invalid phys address,
    > >
    > > I'm a bit lost on the context here. Who's calling
    > per_cpu_ptr_to_phys()?
    >
    >
    > It's drivers/base/cpu.c : show_crash_notes()
    >
    > >
    > >> looking the code below:
    > >> if (in_first_chunk) {
    > >> if (!is_vmalloc_addr(addr))
    > >> return __pa(addr);
    > >> else
    > >> return page_to_phys(vmalloc_to_page(addr));
    > >> } else
    > >> return page_to_phys(pcpu_addr_to_page(addr));
    > >>
    > >> I dont understand per cpu allocation well, if addr is not in
    > first chunk
    > >> then it should be in vmalloc area?
    > >
    > > Yes, it is. First chunk can be embedded in the kernel linear address
    > > space but from the second one, it's always set up from the top of the
    > > vmalloc area with the same offset layout as the first chunk.
    >
    >
    > in this case ffff880667c19ad0 fall out of vmalloc area and it's not in
    > first chunk also.
    >
    > >
    > >> Tejun, do you have any idea about this?
    > >
    > > Can you please tell me how to reproduce the problem? I'll try to find
    > > out what's going on.
    >
    >
    > make sure kernel support CRASH DUMP, then cat
    > /sys/devices/system/cpu/cpu[x]/crash_notes
    >
    > Tim Hartrick <tim@edgecast.com <mailto:tim@edgecast.com>> reported
    > the problem when test kdump.
    > But I can not reproduce this. I think tim can help to test
    >
    > >
    > > Thanks.
    > >
    >
    >
    >
    > --
    > Thanks
    > Dave
    >



    --
    Thanks
    Dave


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