On Thu, Aug 21, 2008 at 11:13 AM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:> Rafał Miłecki wrote:>> I added full dmesg 5 minutes after adding grepped:>> http://bugzilla.kernel.org/attachment.cgi?id=17331>>>> OK, I think I see the problem (pasted from bugzilla comment):>>>>>>> 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> - 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> ^^^^^^^^^^ this is just estimated. and worst case. > 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]> ^^^^^^^^^^^^^^^^^^^^^^^this is correct value used finally.>> 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.> <<<< YH˙ôčş{.nÇ+?ˇ?Ž??+%?Ë˙ąéÝśĽ?w˙ş{.nÇ+?ˇ¤zšŢ?ű^˛×Ťłř§ś?ĄÜ¨}Š?˛Ć zÚ&j:+v?¨ţř Żů ŽwĽţ?ŕ2?Ţ?¨čÚ&˘)ߥŤaśÚ˙˙űŕzżäzšŢ?ú+?ů???ݢj˙?wčţf
