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    SubjectRe: [Bug #11313] Plugging HDMI causes "unable to handle kernel paging request"
    On Thu, 21 Aug 2008, Jeremy Fitzhardinge wrote:
    >
    > >>>>
    > Some notes as I pick through all the evidence so far:
    >
    > - the crash is specifically because there are reserved bits set in the pmd
    > - the pmd is b02a00043a6001a3 in both cases

    Yes, it's corrupt, it should be
    800000013a6001a3

    > - the vaddr is ffff88013a600000 in the first crash, and
    > ffff81013a6d1c00 in the second
    > corresponding to the same large-page pmd mapping of phys page 0x13a600000
    > - this maps to e820 entry
    > BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
    > - the corresponding boot-time mapping is
    >
    > init_memory_mapping
    > 0100000000 - 0140000000 page 2M
    > kernel direct mapping tables up to 140000000 @ b000-11000
    > ^^^^^^^^^^
    > addr 100000000 reusing pgd 201880 0000000000202063
    > last_map_addr: 140000000 end: 140000000
    >
    > !!! and the memory allocated for this pagetable is:
    > #5 [0000008000 - 000000b000] PGTABLE ==> [0000008000 - 000000b000]
    > #6 [000000b000 - 000000c000] PGTABLE ==> [000000b000 - 000000c000]
    > ^^^^^^^^^^^^^^^^^^^^^^^
    >
    > IOW, it's mapping using b000-11000, but it has only reserved b000 - c000
    >
    > Also, this is right in the middle of the ISA area, which seems risky.
    > <<<<
    >
    > Bug #11237 shows the same symptom, so I'm pretty confident they're dups now.

    [ Sorry, I'm replying to #11313 even though we think it's dup of #11237. ]

    Haven't you got that backwards?

    My reading is that find_early_table_space set aside b000-11000 for the
    worst case possible, but actually only b000-c000 was needed (because
    most of the tables were already there): no problem.


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