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    SubjectRe: init failing in 2.3.6
    On 11 Jun 99, at 13:24, Paul Mackerras wrote:

    > I am seeing a problem with 2.3.6 where init is failing to start
    > correctly with an error about not being able to map shared libraries.
    > (This is on my powermac with the current vger tree, but that's very
    > close to the official tree these days.)
    >
    > The problem is that an mmap is failing with ENOMEM. I tracked this
    > down to the do_munmap call from do_mmap failing because the address
    > was not page-aligned. It wasn't page-aligned because
    > get_unmapped_area was returning an non-page-aligned address, because
    > there was a vma with a non-page-aligned end value. This in turn was
    > because earlier on, during an execve syscall, load_elf_interp had
    > called do_brk with a len parameter which wasn't a multiple of the page
    > size.
    >
    > I am about to try this patch, which makes do_brk page-align its len
    > parameter:
    >
    > --- mm/mmap.c~ Thu Jun 10 09:49:31 1999
    > +++ mm/mmap.c Tue Jun 11 21:48:50 2019
    > @@ -728,6 +728,9 @@
    > struct vm_area_struct * vma;
    > unsigned long flags, retval;
    >
    > + if ((len = PAGE_ALIGN(len)) == 0)
    > + return addr;
    > +
    > /*
    > * mlock MCL_FUTURE?
    > */
    >
    > If instead all callers of do_brk should ensure that len is a multiple
    > of the page-size, I'm sure someone will post a better patch. :-)

    I had this booting problem too. My specs are:
    SuSE 6.1 (mostly unchanged),
    egcs-2.91.66, binutils 2.9.1.0.22,
    glibc 2.0.7pre6 on an i686 system.
    2.3.5 worked ok, but with 2.3.6 i had this problem.

    However this patch helped me. It compiled ok and the problem was
    fixed.

    The only thing i noticed was an error message during the end of the
    kernel boot sequence, which i have never seen before:

    kmem_grow: called nonatomically from int - size-32

    If anybody wants to know more, please mail me.

    -Helmut

    -
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