Messages in this thread |  | | | Date | Fri, 30 May 2008 15:30:06 -0700 (PDT) | | From | Linus Torvalds <> | | Subject | Re: Top kernel oopses/warnings for the week of May 30th 2008 |
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On Fri, 30 May 2008, Arjan van de Ven wrote: > > ok for some it did gather this information, and it is > > kernel BUG at mm/highmem.c:319!
That's just _odd_. The call chain actually has kmap() in it, and kmap does:
if (!PageHighMem(page)) return page_address(page); return kmap_high(page); so if it's the one at line 319, which says
BUG_ON(!PageHighMem(page));
then I wonder what happened to that PageHighMem() test of the page in between..
Ahh.. Not the same "page". It looks like it's in the flush_all_zero_pkmaps() path, and it's clearing some _other_ page in the pkmap table in order to make room for the new one. So the page that causes problems is from here:
page = pte_page(pkmap_page_table[i]);
rather than the one we're trying to map.
Not that it explains the BUG_ON(). We should only insert page table entries into the pkmap_page_table[] array in map_new_virtual(), which in turn is only called from kmap_high(), which in turn means that *those* pages have also gine through the PageHighMem() test.
So it sounds like we either - have corruption in pkmap_page_table[] - or pte_page() doesn't reverse mk_pte(page) propely, and one or the other is broken.
Does anybody know if the fc9 x86-32 kernel is built with PAE enabled? Might this be another PAE bit-masking bug and thus possibly fixed by the PTE_MASK changes?
Linus
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