linux-kernel - Re: sata_sil24 broken since 2.6.23-rc4-mm1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20071003175105.GT19691@waste.org>
Date:	Wed, 3 Oct 2007 12:51:05 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Tejun Heo <htejun@...il.com>, Jeff Garzik <jeff@...zik.org>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: sata_sil24 broken since 2.6.23-rc4-mm1

On Wed, Oct 03, 2007 at 07:36:55PM +0200, Torsten Kaiser wrote:
> On 10/3/07, Matt Mackall <mpm@...enic.com> wrote:
> > On Wed, Oct 03, 2007 at 05:55:10PM +0200, Torsten Kaiser wrote:
> > > This patch removes clear_refs_smap() from fs/proc/task_mmu.c by moving
> > > its code to a new function. But during the move the main for-loop from
> > > clear_refs_smap was changed:
> > >
> > > old:
> > >       for (vma = mm->mmap; vma; vma = vma->vm_next)
> > >               if (vma->vm_mm && !is_vm_hugetlb_page(vma))
> > >                       walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
> > >                                       &clear_refs_walk, vma);
> > >
> > > new:
> > >       for (vma = mm->mmap; vma; vma = vma->vm_next)
> > >               if (!is_vm_hugetlb_page(vma))
> > >                       walk_page_range(mm, vma->vm_start, vma->vm_end,
> > >                                       &clear_refs_walk, vma);
> > >
> > > The walk_page_range() is no longer called on vma->vm_mm, but on mm directly.
> > > I don't know how this can kill the sata_sil24-driver, but at least it
> > > looks suspicious.
> >
> > That code should be fine. Further, it's pretty unlikely that this code
> > ever gets invoked. This whole interface was only recently added by
> > Google folks and its usage is pretty obscure.
> >
> > Oh wait - you're _at_ Google, aren't you? Perhaps you're actually
> > using clear_refs.
> 
> No. I'm just using Google Mail.

Ahh, I see. Wasn't aware of the trademark dispute..

> Of note might be, that at the time of this error init has not been
> started. I'm using a program from initramfs to start the RAID.
> The initramfs was primarily build using the genkernel package from
> gentoo, but I have removed some parts of it (kernel modules and some
> other part I no longer remember)

Then I really don't see how these patches can have anything to do with
your problem. They only affect some currently obscure files in /proc
and it's unlikely to have any impact at init time. It's more likely
that there's some code alignment Heisenbug or you got a false negative
somewhere in your bisection.

-- 
Mathematics is the supreme nostalgia of our time.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/