linux-kernel - Re: [linux-pm] Regression: First hibernation attempt fails

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Date:	Fri, 10 Apr 2009 12:35:02 +0100
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	Pavel Machek <pavel@....cz>
CC:	linux-pm@...ts.linux-foundation.org,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [linux-pm] Regression: First hibernation attempt fails

Pavel Machek wrote:
> On Fri 2009-04-10 12:08:13, Alan Jenkins wrote:
>   
>> Pavel Machek wrote:
>>     
>>> On Thu 2009-04-09 12:13:03, Alan Jenkins wrote:
>>>   
>>>       
>>>> Yet another issue in 2.6.30-rc1 which was not present in 2.6.29 :-).  I
>>>> wonder if it rings any bells?
>>>>
>>>> On my laptop (EEE 4G), the first attempt at hibernation fails. 
>>>> Subsequent attempts succeed.
>>>>
>>>> If I use s2disk as normal, I see "snapshotting system", then before it
>>>> gets to write out the image, it aborts and switches back to X.   I can't
>>>> see any error message, even if I check the log with "dmesg".
>>>>
>>>> If I use "echo disk > /sys/power/state", echo reports the error "Cannot
>>>> allocate memory".
>>>>
>>>> This only happens if I've logged in to X first.  In fact, I narrowed it
>>>> down to gnome-power-manager.  If I kill gnome-power-manager beforehand,
>>>> then it doesn't happen.
>>>>         
>>> Anything interesting in dmesg?
>>>       
>> Nothing obvious. I've attached my latest at
>> <http://bugzilla.kernel.org/show_bug.cgi?id=13058>.
>>     
>
> Ok, next theory was that some module stuff is responsible (IIRC, from
> the lists). Can you try with everything-built-in (no modules) kernel?
> 									Pavel
>   

It's still present in v2.6.30-rc1-136-g62b8e68, which includes "module:
try_then_request_module must wait".

I don't think it's due to a missing module, because it doesn't happen if
I run "s2disk" from a console without logging in to KDE. I've put some
more details in Bugzilla about how it is reproduced (and what makes it
go away), it's a bit confusing.

But so long as I get the conditions right, it reproduces 100%. I'm going
to just try bisecting it - unless anyone has any more suggestions.

Thanks
Alan
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