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    SubjectRe: ACPI hotplug panic with current git head
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    On Thu, 2009-01-15 at 14:22 -0500, Len Brown wrote:
    > On Thu, 15 Jan 2009, James Bottomley wrote:
    >
    > > On Mon, 2009-01-12 at 18:48 -0600, James Bottomley wrote:
    > > > On Mon, 2009-01-12 at 16:16 -0500, Len Brown wrote:
    > > > > > This is on an IBM Maia system with the calgary IOMMU enabled. It's a
    > > > > > fatal boot up panic.
    > > > > >
    > > > >
    > > > > James,
    > > > > A guided bisect...
    > > > > Please let me know which of these fail
    > > > >
    > > > > a3a798c88a14b35e5d4ca30716dbc9eb9a1ddfe2 is 2.6.29 at ACPI merge
    > > > > efcb3cf7f00c3c424db012380a8a974c2676a3c8 is 2.6.29 before ACPI merge
    > > >
    > > > Didn't try these (being after the failure)
    > > >
    > > > > ec9f168fcc344d2ffec1c8c822076bf22dab5c33 is 2.6.28 with most ACPI
    > > >
    > > > This is the failing one.
    > > >
    > > > > e8443c358c34f3fe65236e24147ddf0cd0e61b08 is 2.6.28 plus just ACPICA
    > > >
    > > > This one boots fine.
    > > >
    > > > > Please test the "2.6.28+ACPICA" one first.
    > > > > If it fails, we are close so you can skip the others above
    > > > > and bisect between that and 2.6.28.
    > > >
    > > > I'll try bisecting between ec9f168fcc344d2ffec1c8c822076bf22dab5c33 and
    > > > e8443c358c34f3fe65236e24147ddf0cd0e61b08.
    > >
    > > OK, bisection complete. It's not actually coming from the ACPI tree but
    > > from the PCI one (appropriate CC's added).
    > >
    > > The commit causing the boot panic is:
    > >
    > > commit e8c331e963c58b83db24b7d0e39e8c07f687dbc6
    > > Author: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
    > > Date: Wed Dec 17 12:09:12 2008 +0900
    > >
    > > PCI hotplug: introduce functions for ACPI slot detection
    > >
    > > I'm still not sure why, though
    >
    > Nothing jumped out at me in the patch.
    > Does reverting e8c331e963c58b83db24b7d0e39e8c07f687dbc6
    > make the boot crash go away?

    Yes, but then it would ... the call sequence is through the reverted
    code.

    James




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