linux-kernel - Re: 2.6.29 on MacBook 2,1 fails to reboot (was Re: 2.6.29-git13: Reported regressions from 2.6.28)

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Date:	Tue, 7 Apr 2009 10:20:37 -0700
From:	Justin Mattock <justinmattock@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	"Trenton D. Adams" <trenton.d.adams@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: 2.6.29 on MacBook 2,1 fails to reboot (was Re: 2.6.29-git13: 
	Reported regressions from 2.6.28)

On Tue, Apr 7, 2009 at 10:10 AM, Stefan Richter
<stefanr@...6.in-berlin.de> wrote:
> Trenton D. Adams wrote:
>> On Tue, Apr 7, 2009 at 10:16 AM, Stefan Richter
>> <stefanr@...6.in-berlin.de> wrote:
>>> Linus Torvalds wrote:
>>>> On Mon, 6 Apr 2009, Rafael J. Wysocki wrote:
>>>>> Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=13018
>>>>> Subject              : 2.6.29 on MacBook 2,1 fails to reboot
> ...
>>>> The bug _sounds_ like some deadlock due to lock problems - the shutdown
>>>> path often triggers locks that no other path really cares about. And we
>>>> had some lock problems in the sound subsystem that got fixed post-2.6.28,
>>>> for example.
>>>>
>>>> And it looks like the problem is somewhere in sound shutdown:
>>>>
>>>> 12181 delete_module("snd_hda_codec", O_RDONLY|O_EXCL) = -1 EAGAIN (Resource temporarily unavailable) <0.000011>
>>>>
>>>> So commits like 91054598f794fb5d8a0b1e747ff8e2e8fc2115b3 ("ALSA: pcm_oss,
>>>> fix locking typo") might explain it.
> ...
>>> could it be the same as this one?
>>> http://bugzilla.kernel.org/show_bug.cgi?id=12321
>>> "System hangs when unloading alsa modules"
>>> http://bugs.gentoo.org/show_bug.cgi?id=253535
>>> "System hangs when unloading alsa modules on Kernel >2.6.28"
> ...
>> The first one looks similar, if not identical.  The second one
>> doesn't, because my problem happens on 2.6.29 only, not 2.6.28.
>
> The Gentoo bug entry too is about a regression _after_ 2.6.28. :-)
> I.e. 2.6.28.y. are unaffected.  It's actually just the downstream
> duplicate of the kernel.org bug entry.
>
>> Either way, the unload problem with the module didn't happen in
>> 2.6.28.
>
> Interdependencies between ALSA modules have changed.  The Gentoo init
> scripts attempted to unload them in an order which deadlocked modprobe
> due to dependencies.  The fix for Gentoo is to just not unload the
> modules on system shutdown.  My Gentoo/amd64 Mac mini was affected by
> this too; fixed by userland update.
>
> (Added Cc to tiwai@...e.de)
> --
> Stefan Richter
> -=====-=-=== -=-= -==-=
> http://arcgraph.de/sr/
> --
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With the imac(kernel 2.6.29)
/sbin/shutdown -h now   (works)
but
/sbin/reboot
hangs

-- 
Justin P. Mattock
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