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From: Valdis.Kletnieks@vt.edu
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Hoo-fscking-ray - (was Re: 2.6.25-rc3-mm1 - BUG at system shutdown time
Date: Fri, 21 Mar 2008 23:11:18 -0400	[thread overview]
Message-ID: <3370.1206155478@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Fri, 21 Mar 2008 21:12:11 BST." <20080321201211.GA21609@elte.hu>

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On Fri, 21 Mar 2008 21:12:11 BST, Ingo Molnar said:
> 
> * Valdis.Kletnieks@vt.edu <Valdis.Kletnieks@vt.edu> wrote:
> 
> > On Fri, 21 Mar 2008 20:58:13 BST, Ingo Molnar said:
> > 
> > > no, we frequently regenerate the x86.git tree so the dates have little 
> > > relevance. If for any particular pull, x86/base is good and x86/latest 
> > > is bad, then the bug is somewhere in those 200-300 patches inbetween. 
> > > They are lined up linearly so should be perfectly bisectable.
> > 
> > OK, off to go try the last few bisects then...
> 
> well ... your git bisection log does look suspiciously 'good', so 
> something is wrong thee i think :-(
> 
> the chance to get 8 'good' bisection points in a row is 1:256. OTOH, the 
> freshest x86 patches are always at the 'end' of the queue - which are 
> also the ones most likely to break anything.

On the other hand, this was broken in 25-rc3-mm1, so it's not a "fresh"
patch...

> Are you sure the x86/base point is indeed 'good'? You can check it via:
> 
>  git-checkout -b tmp x86/base
> 
> and build+boot it.

Did that, and it's good (as in 'shutdown -h now' powers off rather than BUG and
hanging).

"You're at Witt's End" -- Adventure, c. 1978

OK.. so far I've got:

25-rc3-mm1 is bad
25-rc5-mm1 is bad, and bisected down to git-x86.patch
x86/base as pulled last week is good
bisected to within the last 9 entries of x86/latest is good.

So I can't seem to replicate it using the git-x86 tree, but bisecting -mm
implicates it.  How very strange.

I even went and pulled Andrew's mmotm pile as of this afternoon, and got that
to built after having to heave only a dozen patches over the side and one or
two hand-fixes of patches - and *that* one is good too.

So I'm thinking that it was some "bump in the night" that was broken in the
x86 tree when Andrew pulled it for 25-rc5-mm1, but was fixed by the time I
pulled it a few days later to start git-bisecting it.

Given that -mmotm isn't showing the problem, I'm having a hard time coming
up with enthusiasm to keep chasing it.  If I see it happen again in a -mm
or Linus kernel, I'll restart the chase then....



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  reply	other threads:[~2008-03-22  3:11 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-04  9:19 2.6.25-rc3-mm1 Andrew Morton
2008-03-04 11:59 ` 2.6.25-rc3-mm1 Cornelia Huck
2008-03-04 19:35   ` 2.6.25-rc3-mm1 Greg KH
2008-03-04 13:12 ` [BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerpc () Kamalesh Babulal
2008-03-04 14:40   ` Michael Neuling
2008-03-04 18:33     ` Andrew Morton
2008-03-05  8:23       ` Benjamin Herrenschmidt
2008-03-06  0:03       ` Benjamin Herrenschmidt
2008-03-06  0:44         ` Andrew Morton
2008-03-06  0:52           ` Benjamin Herrenschmidt
2008-03-04 18:36   ` Andrew Morton
2008-03-04 18:47     ` Pekka Enberg
2008-03-04 19:18     ` Pekka Enberg
2008-03-05  8:22   ` Benjamin Herrenschmidt
2008-03-04 16:35 ` 2.6.25-rc3-mm1 (IDE) Randy Dunlap
2008-03-06 21:14   ` Bartlomiej Zolnierkiewicz
2008-03-04 16:45 ` 2.6.25-rc3-mm1 (CCISS) Randy Dunlap
2008-03-04 17:02   ` Miller, Mike (OS Dev)
2008-03-04 17:14     ` Randy Dunlap
2008-03-04 18:14       ` Jens Axboe
2008-03-04 19:12 ` [PATCH 2.6.25-rc3-mm1] fix ext2 borkage Hugh Dickins
2008-03-04 19:20 ` [BUG] 2.6.25-rc3-mm1 kernel bug while running libhugetlbfs Kamalesh Babulal
2008-03-04 19:51   ` Andrew Morton
2008-03-04 22:01     ` Adam Litke
2008-03-05  7:52       ` Kamalesh Babulal
2008-03-04 20:24 ` 2.6.25-rc3-mm1 (wakeup) Randy Dunlap
2008-03-04 22:33   ` Rafael J. Wysocki
2008-03-05  7:40     ` Sam Ravnborg
2008-03-04 21:26 ` 2.6.25-rc3-mm1 (9p docs) Randy Dunlap
2008-03-04 21:43   ` Eric Van Hensbergen
2008-03-05  7:21 ` 2.6.25-rc3-mm1 - PROFILE_LIKELY redux Valdis.Kletnieks
2008-03-05 17:45   ` Andi Kleen
2008-03-05 18:02     ` Andrew Morton
2008-03-05 18:22       ` Andi Kleen
2008-03-05 22:26       ` Valdis.Kletnieks
2008-03-05 23:49         ` Andrew Morton
2008-03-05 19:59     ` Valdis.Kletnieks
2008-03-05 21:56       ` Andi Kleen
2008-03-05 10:51 ` prctl(0x8) -> EINVAL [Was: 2.6.25-rc3-mm1] Jiri Slaby
2008-03-05 10:59   ` Jiri Slaby
2008-03-05 14:06   ` Serge E. Hallyn
2008-03-05 15:18     ` Jiri Slaby
2008-03-09 16:28     ` Andrew Morgan
2008-03-05 13:04 ` 2.6.25-rc3-mm1 Pavel Emelyanov
2008-03-05 13:12   ` 2.6.25-rc3-mm1 (SYSFS=n breaks module engine) Pavel Emelyanov
2008-03-05 13:31   ` 2.6.25-rc3-mm1 Kay Sievers
2008-03-05 13:38     ` 2.6.25-rc3-mm1 Pavel Emelyanov
2008-03-05 13:54       ` 2.6.25-rc3-mm1 Kay Sievers
2008-03-05 14:28         ` 2.6.25-rc3-mm1 Pavel Emelyanov
2008-03-05 16:40   ` 2.6.25-rc3-mm1 Greg KH
2008-03-05 16:59     ` 2.6.25-rc3-mm1 Pavel Emelyanov
2008-03-05 17:07       ` 2.6.25-rc3-mm1 Greg KH
2008-03-05 21:34 ` 2.6.25-rc3-mm1 ppc64 boot hang Badari Pulavarty
2008-03-05 21:54   ` Andrew Morton
2008-03-05 22:35     ` Badari Pulavarty
2008-03-05 23:17     ` Stephen Rothwell
2008-03-07  3:58 ` 2.6.25-rc3-mm1 - BUG at system shutdown time Valdis.Kletnieks
2008-03-07  6:16   ` Andrew Morton
2008-03-07  7:52     ` Valdis.Kletnieks
2008-03-07  8:06       ` Thomas Gleixner
2008-03-07  8:23         ` Valdis.Kletnieks
2008-03-07  8:34           ` Thomas Gleixner
2008-03-07 19:30             ` Valdis.Kletnieks
2008-03-12  7:32   ` Andrew Morton
2008-03-13  2:19     ` Valdis.Kletnieks
2008-03-13  2:32       ` Andrew Morton
2008-03-13  3:57         ` Valdis.Kletnieks
2008-03-13  4:27           ` Andrew Morton
2008-03-14 18:50             ` Valdis.Kletnieks
2008-03-21 13:41       ` Ingo Molnar
2008-03-21 19:38         ` Valdis.Kletnieks
2008-03-21 19:58           ` Ingo Molnar
2008-03-21 20:05             ` Valdis.Kletnieks
2008-03-21 20:12               ` Ingo Molnar
2008-03-22  3:11                 ` Valdis.Kletnieks [this message]
2008-03-22 12:09                   ` Hoo-fscking-ray - (was " Ingo Molnar

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