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    SubjectRe: kernel BUG at arch/x86_64/mm/../../i386/mm/hugetlbpage.c:140!
    Date
    On Saturday 03 March 2007, Bill Irwin wrote:
    > On Fri, Mar 02, 2007 at 04:51:15PM +0300, Alexander Y. Fomichev wrote:
    > > I'm hit a bug on 2.6.21-rc1 at startup of mysql with 'large-pages' flag
    > > set. (at this point mysql trying to allocate pages from hugetlb pool by
    > > sysv shm syscalls). Seems like it could be triggered by previous badness
    > > and probably hugetlb itself is not related. Anyway i couldn't reproduce
    > > it by now with 2.6.21-rc2 git commit
    > > 562aa1d4c6a874373f9a48ac184f662fbbb06a04. Very likely it has been fixed
    > > somwhere between 2.6.21-rc1 and -rc2, but i couldn't find something
    > > related by git log so any comments are welcome.
    >
    > If you have a known-working kernel version, git-bisect might help you
    > track down where it was introduced. Given the messages prior to the
    > hugetlbpage.c BUG_ON I'd say that this is something else besides the
    > specific code listed by line number,

    Nop, seems like it is hugetlb bug fixed by Adam
    commit 516dffdcd8827a40532798602830dfcfc672294c
    [PATCH] Fix get_unmapped_area and fsync for hugetlb shm segments
    I've disregard it thoughtlessly so Adam marks it specific for powerpc/ia64.
    (hmm.. i donno realy why, huge pages should be alined anyway and if i
    understend it correctly it may not be if is_file_hugepages() fails)

    As of "junk" just before the BUG this again IIUC because o-direct staff
    catches this issue before hugetlb.

    > though I wouldn't rule out hugetlb
    > having tripped over itself before the actual BUG.
    >

    Yep, it is.

    > -- wli


    --
    Best regards.
    Alexander Y. Fomichev <gluk@php4.ru>
    Public PGP key: http://sysadminday.org.ru/gluk.asc
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