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    SubjectRe: Make sure we populate the initroot filesystem late enough
    On Sun, Feb 25, 2007 at 11:01:06PM -0500, David Woodhouse wrote:
    > Yeah, I did that before giving up on it for the day and going in search
    > of dinner. It changes the failure mode to a BUG() in
    > cache_free_debugcheck(), at line 2876 of mm/slab.c
    > It smells like the pages weren't actually reserved in the first place
    > and we were blithely allocating them. The only problem with that theory
    > is that the initrd doesn't seem to be getting corrupted -- and if we
    > were handing out its pages like that then surely _something_ would have
    > scribbled on it before we tried to read it.
    > When I head back in tomorrow morning I'll instrument free_initrd_mem()
    > to check that the PageReserved bit was actually set on each page, before
    > clearing it. And I'll make the page allocation routines check whether
    > they're giving out pages between initrd_start and initrd_end, etc.

    Another few things to try would be inserting checks in page_alloc.c for
    pages in that specific range before some flag set in free_initrd_mem()
    is set, and (conflicting with that, though easily reconciled) unmapping
    initrd memory in free_initrd_mem() instead of freeing it.

    -- wli
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      Last update: 2007-02-26 08:03    [W:0.021 / U:9.588 seconds]
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