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    SubjectRe: pipe/page fault oddness.
    On Wed, 01 Oct 2014 23:32:15 -0400
    Sasha Levin <sasha.levin@oracle.com> wrote:

    > On 10/01/2014 06:28 PM, Chuck Ebbert wrote:
    > > On Wed, 01 Oct 2014 18:08:30 -0400
    > > Sasha Levin <sasha.levin@oracle.com> wrote:
    > >
    > >> > On 10/01/2014 04:20 PM, Linus Torvalds wrote:
    > >>> > > So I'm really sending this patch out in the hope that it will get
    > >>> > > comments, fixup and possibly even testing by people who actually know
    > >>> > > the NUMA balancing code. Rik? Anybody?
    > >> >
    > >> > Hi Linus,
    > >> >
    > >> > I've tried this patch on the same configuration that was triggering
    > >> > the VM_BUG_ON that Hugh mentioned previously. Surprisingly enough it
    > >> > ran fine for ~20 minutes before exploding with:
    > >> >
    > >> > [ 2781.566206] kernel BUG at mm/huge_memory.c:1293!
    > > That's:
    > > BUG_ON(is_huge_zero_page(page));
    > >
    > > Can you change your scripts to show the source code line when
    > > the error is a BUG_ON()? The machine code disassembly after the
    > > oops message doesn't really help.
    > >
    >
    > Hum? The source code line is the first line in the trace:
    >
    > [ 2781.566206] kernel BUG at mm/huge_memory.c:1293!
    >

    I meant, display the contents of that line so we can see what the
    BUG_ON() was triggered by. In some cases you might have a custom patch
    applied or be running a version that some people don't have handy.


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