linux-kernel - Re: 2.6.24-rc4-mm1

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Message-ID: <20071206193843.GA25125@kroah.com>
Date:	Thu, 6 Dec 2007 11:38:43 -0800
From:	Greg KH <greg@...ah.com>
To:	Valdis.Kletnieks@...edu
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: 2.6.24-rc4-mm1

On Thu, Dec 06, 2007 at 02:18:08PM -0500, Valdis.Kletnieks@...edu wrote:
> 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@...hat.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?

I don't know, it all depends on what is in the dm patches.  Hopefully
everything that I have changed will manifest with a build breakage to
obviously detect that something needs to be fixed up.

But I've been known to mess things up that I didn't intend to :)

If there's anything that I can do to test this, please let me know.

thanks,

greg k-h
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