linux-kernel - Re: [SUPERH / PATA / SCSI] Unable to do start userland after kernel boot (BISECTED)

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Message-Id: <20071031025621.a9f3f880.Kristoffer.ericson@gmail.com>
Date:	Wed, 31 Oct 2007 02:56:21 -0700
From:	Kristoffer Ericson <kristoffer.ericson@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Kristoffer Ericson <kristoffer.ericson@...il.com>,
	linuxsh <linuxsh-dev@...ts.sourceforge.net>,
	linux-main <linux-kernel@...r.kernel.org>
Subject: Re: [SUPERH / PATA / SCSI] Unable to do start userland after kernel
 boot (BISECTED)

On Fri, 26 Oct 2007 04:46:18 +0900
Paul Mundt <lethal@...ux-sh.org> wrote:

> On Thu, Oct 25, 2007 at 09:22:40PM -0700, Kristoffer Ericson wrote:
> > The bottom line seems to be that it fails to attach scsi sg0. It
> > explains why it doesn't work, but not why it stopped working. And this
> > has nothing to do with the current kernel config, I've been over that
> > the last 4 days. It all started when I synced my jlime-current.git
> > repository with linux-2.6.git. As you can see I had 2.6.23-rc6 and then
> > synced up to 2.6.23-rc8/rc9 and thats when the troubles started.
> > 
> At least that suggests it's not fallout from the INTC changes in -rc1, so
> that helps to narrow it down a bit. Since you have a known good and bad,
> it would be nice if you could bisect this to figure out what exactly
> caused the regression. There weren't any SH-specific changes between rc6
> and rc8/rc9 at least.

I've spent a couple of hours bisecting it, and this is where it stops working. I haven't reversed the patch yet, simply because Im dead tired :D Will do that tommorow, but Im quite confident that this is the correct bug.

023ef184fff6ac2e7cba345708f35536a2a419cb is first bad commit
commit 023ef184fff6ac2e7cba345708f35536a2a419cb
Author: Stuart Menefy <stuart.menefy@...com>
Date:   Fri Sep 28 12:36:35 2007 +0900

    sh: __copy_user() optimizations for small copies.
    
    This implements a fast-path for small (less than 12 bytes) copies,
    with the existing path treated as the slow-path and left as the default
    behaviour for all other copy sizes.
    
    Signed-off-by: Stuart Menefy <stuart.menefy@...com>
    Signed-off-by: Paul Mundt <lethal@...ux-sh.org>

:040000 040000 43f62cf05d1f71a5564b232dfd9e8492af909a90 4ab51dc5b85bc9bc86d58331845e525a67751be8

My bisect log:
*START_ BAD     -   _CURRENT_                                                   30 October              "No Init found"
BAD     -   b5869ce7f68b233ceb81465a7655be0d9a5f3dbb    "Merge git://..sched"   15 October              "No Init found"
BAD     -   f248488b397d52717f6683e2e53200aa687ffc89    "merge infradead.org"   14 October              "No Init found"
BAD     -   3749c66c67fb5c257771815c186bc32290cacf44    "merge git/avi/kvm"     13 October              "No Init found"
BAD     -   dcf397f037f52add9945eced57ca300ab6a4413c    "merge sh-2.6"          13 October              "No Init found"
BAD     -   5d9df8eeacec943c9599f1cfd1069bc8cced3de6    "sh: Fix SH-4 DMAC.."   "8 October"             "No Init found"
BAD     -   e5137682a1ad48bc5306070935c277e262f119ef    "sh: Tidy up gUSA .."   "28 September"          "No Init found"
BAD     -   023ef184fff6ac2e7cba345708f35536a2a419cb    "sh: __copy_user().."   "28 September"          "No Init found"
GOOD    -   24eb17e0813490497f4d5b2fad218bdba402cece    "sh: clkfwk: Support."  "28 September"          "WORKS!"
GOOD    -   cb7af21f7d370edb3a6a6d3e15cb17c8fd61591e    "sh: Use boot_cpu_d."   "27 September"          "WORKS!"
GOOD    -   c167aeef232c45deaf5c6c9be00a1f71b14962d3    "sh: Kill off dupl.."   "27 September"          "WORKS!"
GOOD    -   1db4e9bb5682fd3fd3f37f7fe9c322e7c5bb7578    "sh: don't enable.."    "11 September"          "WORKS!"
GOOD    -   ab9c232286c2b77be78441c2d8396500b045777e    "Merge..libata-dev"     12 October              "WORKS!"
GOOD    -   ce9d3c9a6a9aef61525be07fe6ba27d937236aa2    "Merge-br.. for linux"  11 October              "WORKS!"
GOOD    -   d85f57938ad1d674dff8077a2e6a36a45dbe0e22    "Merge branch 'master'" 26 Sept                 "WORKS!"
GOOD    -   2aee6198652b32e5eaef29a8f8330a9dd15b8efd    "fixes-jgarzik"         25 Sept                 "WORKS!"
GOOD    -   f3d5e3a4155b6f42f6f6f0a2cc95ca0adbabe1af    "[PPP] L2TP: Fix ..     19 Sept                 "WORKS!"
GOOD    -   53a3f3087be361dacfc02e7a85b6d6142a41ce8a    ~2.6.23-rc              14 Sept                 "WORKS!"
GOOD    -   ea3c4b126ad63bd782c7bb5266bb4fd88e203169    ~2.6.23-rc               4 Sept                 "WORKS!"


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