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    SubjectRe: 2.6.15-mm4 failure on power5
    Date
    On Wed, 18 Jan 2006 01:00, Ingo Molnar wrote:
    > * Michael Ellerman <michael@ellerman.id.au> wrote:
    > > On Tue, 17 Jan 2006 08:52, Dave C Boutcher wrote:
    > > > 2.6.15-mm4 won't boot on my power5 either. I tracked it down to the
    > > > following mutex patch from Ingo: kernel-kernel-cpuc-to-mutexes.patch
    > > >
    > > > If I revert just that patch, mm4 boots fine. Its really not obvious to
    > > > me at all why that patch is breaking things though...
    > >
    > > My POWER5 (gr) LPAR seems to boot ok (3 times so far) with that patch,
    > > guess it's something subtle. That's with CONFIG_DEBUG_MUTEXES=y. And
    > > it's just booted once with CONFIG_DEBUG_MUTEXES=n.
    > >
    > > And now it's booted the full mm4 patch set without blinking.
    >
    > so it booted fine with CONFIG_DEBUG_MUTEXES=n but with that patch not
    > applied?
    >
    > the patch will likely work around the bug, so DEBUG_MUTEXES=y/n should
    > make no difference with that patch applied.

    It booted fine _with_ the patch applied, with DEBUG_MUTEXES=y and n.

    Boutcher, to be clear, you can't boot with kernel-kernel-cpuc-to-mutexes.patch
    applied and DEBUG_MUTEXES=y ?

    But if you revert kernel-kernel-cpuc-to-mutexes.patch it boots ok?

    This is looking quite similar to another hang we're seeing on Power4 iSeries
    on mainline git:
    http://ozlabs.org/pipermail/linuxppc64-dev/2006-January/007679.html

    cheers

    --
    Michael Ellerman
    IBM OzLabs

    email: michael:ellerman.id.au
    inmsg: mpe:jabber.org
    wwweb: http://michael.ellerman.id.au
    phone: +61 2 6212 1183 (tie line 70 21183)

    We do not inherit the earth from our ancestors,
    we borrow it from our children. - S.M.A.R.T Person
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