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    SubjectRe: 2.6.24-rc4-mm1
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    On Thu, 06 Dec 2007 04:04:20 PST, Andrew Morton said:

    > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc4/2.6.24-rc4-mm1/
    > >
    > > Something in here broke LVM support - an initrd that has worked fine for
    > > quite some time suddenly couldn't mount /dev/VolGroup00/root so we get the
    > > infamous "Kernel panic - not syncing: Attempted to kill init!" when we
    > > fall off the end of the initrd and haven't pivoted to the real disk.
    > >
    > > It finds the disk OK:
    > >
    > > [ 81.202310] sd 0:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)
    > > [ 81.214466] sd 0:0:0:0: [sda] Write Protect is off
    > > [ 81.226467] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
    > > [ 81.238436] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
    > > [ 81.250780] sda: sda1 sda2
    > > [ 75.396119] sd 0:0:0:0: [sda] Attached SCSI disk
    > >
    > > but then the lvm command says it can't find the volume group VolGroup00 (which
    > > is actually sda2 - sda1 is a small /boot partition, rest of disk is LVM).
    > >
    > > A quick look at the rc4-mm1 announcement doesn't have any obviously tempting
    > > patch names to start at, so it looks like it's time to play mm-bisect. It may
    > > take me a day or two, as I have some time management issues this week...
    > >
    >
    > OK, thanks.
    >
    > First step would be to eliminate rewrite-rd.patch: maybe the ramdisk driver
    > in which that initrd resides is bust.
    >
    > After that, agk-dm-dm-*.patch are of course the ones to look at.

    How did I not notice them? Yeah, those guys would be on the suspicious list...

    > Please keep dm-devel@redhat.com cc'ed.

    I've gotten it down to about 128 patches, but it's interesting what ended
    up bracketed by GOOD/BAD:

    powerpc-invalid-size-for-swapper_pg_dir-with-config_pte_64bit=y.patch GOOD
    #GREGKH-DRIVER-START
    gregkh-driver-nozomi.patch
    gregkh-moby-patch-tree....
    unbork-gregkh-driver-kset-convert-sys-devices-to-use-kset_create-vioc.patch BAD

    Would I be remiss in hypothesising that something in gregkh-driver-kobject-*
    changed something, and now we need a agk-dm-dm-kobject-fixupage.patch?

    The actual bug is probably elsewhere, but it *manifests* due to gregkh-driver
    tree. Will probably be tomorrow before I get it down further...

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