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

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Message-Id: <200808212107.42356.rjw@sisk.pl>
Date:	Thu, 21 Aug 2008 21:07:41 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
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 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".

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?

Thanks,
Rafael
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