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    SubjectRe: Reading /proc/kcore causes a BUG()
    On Fri, Sep 04, 2009 at 06:16:45PM +0900, KAMEZAWA Hiroyuki wrote:
    > On Fri, 4 Sep 2009 10:00:39 +0100
    > Nick Craig-Wood <nick@craig-wood.com> wrote:
    >
    > > On Fri, Sep 04, 2009 at 09:06:42AM +0900, KAMEZAWA Hiroyuki wrote:
    > > > On Thu, 3 Sep 2009 15:14:55 +0300
    > > > Pekka Enberg <penberg@cs.helsinki.fi> wrote:
    > > > > On Thu, Sep 3, 2009 at 2:34 PM, Nick Craig-Wood<nick@craig-wood.com> wrote:
    > > > > > Is a fix for this going to make 2.6.31?
    > > > > >
    > > > > > To replicate
    > > > > >
    > > > > >  cat /proc/kcore >/dev/null
    > > > > >
    > > > > > See also
    > > > > >
    > > > > >  http://bugzilla.kernel.org/show_bug.cgi?id=13850
    > > [snip]
    > > > > > I tried this on the latest git checkout (as of 2009-09-03 11:00 GMT)
    > > > > > under Xen as a domU.  The bugzilla report states it happens on non xen
    > > > > > machines also.
    > > > > >
    > > > > > I know reading /proc/kcore isn't such a good idea, but badly written
    > > > > > backup scripts are triggering this on our customer's servers :-(
    > > > >
    > > > > AFAICT the bug was fixed but I can't seem to find the patches in
    > > > > Linus' git either. Lets CC Andrew and Hiroyuki-san.
    > > >
    > > > Ah, it's now tested under mmotm. please wait.
    > >
    > > I tried mmotm but I couldn't get it to boot under Xen :-(
    > >
    > > If you send me a patch against latest git I'm willing to test it (I
    > > tried to extract the relevant patch from mmotm but failed dismally)
    >
    > If you already downloaded mmotm, use these patches.
    >
    > vmalloc-unmap-vmalloc-area-after-hiding-it.patch
    > kcore-fix-vread-vwrite-to-be-aware-of-holes.patch
    > kcore-fix-vread-vwrite-to-be-aware-of-holes-update.patch
    > kcore-proc-kcore-should-use-vread.patch
    >
    > All I tested was x86-32/x86-64. then more tests are welcomed.

    I can confirm that these patches fix the problem on x86-32 running
    under Xen DomU - thank you very much.

    --
    Nick Craig-Wood <nick@craig-wood.com> -- http://www.craig-wood.com/nick
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