linux-kernel - Re: [linux-pm] intermittent suspend problem again

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Date:	Wed, 11 Nov 2009 12:29:33 +0100
From:	Ferenc Wagner <wferi@...f.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	yakui.zhao@...el.com, LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [linux-pm] intermittent suspend problem again

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> On Thursday 29 October 2009, Ferenc Wagner wrote:
>
>> "Rafael J. Wysocki" <rjw@...k.pl> writes:
>> 
>>> On Wednesday 28 October 2009, Ferenc Wagner wrote:
>>> 
>>>> 2.6.32-rc5 feels particularly bad, with frequent failures to switch
>>>> off the machine after "S|" or freezes after "Snapshotting system".
>>>> The former does not cause much trouble in itself, as the machine can
>>>> be switched off and resumed all right, but the latter is nasty.
>>>> Suspend to RAM works all the time.  The issue is not reproducible,
>>>> unfortunately, and the kernel change happened almost together with a
>>>> BIOS upgrade.  Yesterday I switched back to 2.6.31 to see whether it
>>>> still works stably with the new BIOS.  I'll report back my findings in
>>>> a couple of days.
>>>
>>> OK, thanks.
>>>
>>> Still, I'm really afraid we won't be able to debug it any further without a
>>> reproducible test case.
>>
>> Can't you perhaps suggest a way forward there?  Or some tricks to create a
>> reproducible test case here?
>
> Well, you can test if the problem is reproducible in the "shutdown" mode of
> hibernation.

Well, both failure modes happen with "shutdown" mode as well (the S|
freeze with yesterday's git, too), but still not reproducibly.  When
s2disk is stuck in "Snapshotting system", the system is not completely
dead, it echoes line feeds and Ctrl-C at least (as added to #14504).

I wonder what you did if the issue was reproducible...  Is that totally
unapplicable if the problem happens with 10% probability only?  Slow,
sure, but until I manage to set up an automated testing bench...
-- 
Thanks,
Feri.
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