linux-kernel - Re: latest -git: hibernate: possible circular locking dependency detected

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Message-ID: <19f34abd0808211214x24af9351tcc077307fd1f2be5@mail.gmail.com>
Date:	Thu, 21 Aug 2008 21:14:03 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>,
	"Max Krasnyanskiy" <maxk@...lcomm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Pavel Machek" <pavel@....cz>
Subject: Re: latest -git: hibernate: possible circular locking dependency detected

On Thu, Aug 21, 2008 at 9:07 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Thursday, 21 of August 2008, Vegard Nossum wrote:
>> On Thu, Aug 21, 2008 at 8:31 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
>> > On Thu, Aug 21, 2008 at 8:22 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> >> On Thursday, 21 of August 2008, Vegard Nossum wrote:
>> >>>
>> >>> I just got this on v2.6.27-rc4 (+ unrelated fix):
>> >>>
>> >>> ACPI: Preparing to enter system sleep state S5
>> >>
>> >> This looks fishy.
>> >>
>> >> Please check what's there in /sys/power/disk .
>> >>
>>
>> Sorry, forgot this one:
>>
>> # cat /sys/power/disk
>> test testproc [shutdown] reboot
>
> Hm, I wonder why 'platform' isn't there.
>
> Perhaps the dmesg log will tell.
>
> [/me looks]
>
> No, it doesn't.  The BIOS evidently supports S4.
>
> [/me looks into the source code]
>
> I have no idea whatsoever how it is possible to have
>
> "ACPI: (supports S0 S1 S3 S4 S5)"
>
> in the log and not to have "platform" in the output of "cat /sys/power/disk".

I'm sorry, I made a stupid mistake: That file was taken from the
system when it was booted with acpi=off. The boot log had acpi
enabled, of course. Here is the same file (now booted without
acpi=off):

# cat /sys/power/disk
[platform] test testproc shutdown reboot

> Can you please add
>
> printk(KERN_CRIT "PM: hibernation_ops = %p\n", hibernation_ops);
>
> at the end of kernel/power/disk.c:hibernation_set_ops() and see if it gets
> printed during boot?

I guess this is now not necessary anymore?


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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