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    SubjectRe: Linux 2.6.38-rc6
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    On Fri, Feb 25, 2011 at 3:14 AM, Dave Airlie <airlied@redhat.com> wrote:
    > On Thu, 2011-02-24 at 16:54 -0800, Linus Torvalds wrote:
    >> On Thu, Feb 24, 2011 at 4:48 PM, Anca Emanuel <anca.emanuel@gmail.com> wrote:
    >> >
    >> > diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
    >> > index e2bf953..e8f8925 100644
    >> > --- a/drivers/video/fbmem.c
    >> > +++ b/drivers/video/fbmem.c
    >> > @@ -1511,6 +1511,7 @@ void remove_conflicting_framebuffers(struct
    >> > apertures_struct *a,
    >> >                               "%s vs %s - removing generic driver\n",
    >> >                               name, registered_fb[i]->fix.id);
    >> >                        unregister_framebuffer(registered_fb[i]);
    >> > +                       registered_fb[i] = NULL;
    >> >
    >> > Tested the patch, and now I get this:
    >> > dmesg: http://pastebin.com/ieMNrA7C
    >> >
    >> > [   12.252328] BUG: unable to handle kernel NULL pointer dereference
    >> > at 00000000000003b8
    >> > [   12.252342] IP: [<ffffffff81311178>] fb_mmap+0x58/0x1d0
    >>
    >> Ok, goodie.
    >>
    >> Or not so goodie, but it does make it clear that yeah, the fb code
    >> seems to be using stale pointers from that registered_fb[] array, and
    >> the whole unregistration process is just racing with people using it.
    >>
    >> Herton had that much bigger patch, can you test it?
    >
    > I think Andy's patch worked, not sure why it fell between the cracks,
    > either didn't appear on lkml or in my inbox at all.
    >
    > if we can get Herton to repost it properly + a tested by I'm happy for
    > it to go in.
    >
    > Dave.
    >
    >

    Tested Andy's patch and it works !
    http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-natty.git;a=commit;h=c5a742b5f78e161d6a13853a7e3e6e1dfa429e69

    Tested-by: Anca Emanuel <anca.emanuel@gmail.com>
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