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    SubjectRe: 2.6.23-rc3-mm1 - memory layout change? - lost support for MAP_32BIT? - mono crashes
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    On Thu, 2007-08-23 at 11:28 +0200, Jiri Kosina wrote:
    > On Wed, 22 Aug 2007, Zan Lynx wrote:
    >
    > > After installing this new wonder kernel on my AMD-64 laptop, I
    > > discovered that Beagle wouldn't start. While enjoying how fast my
    > > system felt ( :) ) I also discovered that Evolution wouldn't start
    > > because it was built with mono integration.
    > [...]
    > > Mono claims to mmap with the MAP_32BIT option.
    > > In -rc3-mm1 strace shows mono's mmap like this:
    > > mmap(NULL, 65536, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|MAP_32BIT, -1, 0) = 0x7fa21f5cb000
    >
    > Hi Zan,
    >
    > thanks for an excellent bugreport. Rather than throwing the whole
    > pie-randomization and flexmmap support away, could you please test the
    > patch below and let me know whether it fixes all your issues? Thanks.
    >
    >
    > From: Jiri Kosina <jkosina@suse.cz>
    >
    > Handle MAP_32BIT flags properly in x86_64 flexmmap
    >
    > We need to handle MAP_32BIT flags of mmap() properly for 64bit
    > applications with filexible mmap layout.
    >
    > This patch introduces x86_64-specific version of
    > arch_get_unmapped_area_topdown() which differs from the generic one in
    > handling of the MAP_32BIT flag -- when this flag is passed to mmap(), we
    > stick back to the legacy layout for this particular mmap, which gives
    > proper 32bit range.
    >
    > Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    [snip patch]

    This does fix the mono problem. Thank you.
    --
    Zan Lynx <zlynx@acm.org>
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