Messages in this thread | | | Date | Thu, 21 Aug 2008 19:56:24 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: [Bug #11313] Plugging HDMI causes "unable to handle kernel paging request" |
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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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