linux-kernel - Re: [linux-lvm] 2.6.22-rc5 XFS fails after hibernate/resume

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Message-Id: <200707022215.12200.rjw@sisk.pl>
Date:	Mon, 2 Jul 2007 22:15:11 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	David Greaves <david@...eaves.com>
Cc:	Tejun Heo <htejun@...il.com>, David Chinner <dgc@....com>,
	David Robinson <zxvdr.au@...il.com>,
	LVM general discussion and development 
	<linux-lvm@...hat.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com, linux-pm <linux-pm@...ts.osdl.org>,
	LinuxRaid <linux-raid@...r.kernel.org>
Subject: Re: [linux-lvm] 2.6.22-rc5 XFS fails after hibernate/resume

On Monday, 2 July 2007 18:36, David Greaves wrote:
> Rafael J. Wysocki wrote:
> > On Monday, 2 July 2007 16:32, David Greaves wrote:
> >> Rafael J. Wysocki wrote:
> >>> On Monday, 2 July 2007 12:56, Tejun Heo wrote:
> >>>> David Greaves wrote:
> >>>>>> Tejun Heo wrote:
> >>>>>>> It's really weird tho.  The PHY RDY status changed events are coming
> >>>>>>> from the device which is NOT used while resuming
> >>>>> There is an obvious problem there though Tejun (the errors even when sda
> >>>>> isn't involved in the OS boot) - can I start another thread about that
> >>>>> issue/bug later? I need to reshuffle partitions so I'd rather get the
> >>>>> hibernate working first and then go back to it if that's OK?
> >>>> Yeah, sure.  The problem is that we don't know whether or how those two
> >>>> are related.  It would be great if there's a way to verify memory image
> >>>> read from hibernation is intact.  Rafael, any ideas?
> >>> Well, s2disk has an option to compute an MD5 checksum of the image during
> >>> the hibernation and verify it while reading the image.
> >> (Assuming you mean the mainline version)
> >>
> >> Sounds like a good think to try next...
> >> Couldn't see anything on this in ../Documentation/power/*
> >> How do I enable it?
> > 
> > Add 'compute checksum = y' to the s2disk's configuration file.
> 
> Ah, right - that's uswsusp isn't it? Which isn't what I'm having problems with 
> AFAIK?
> 
> My suspend procedure is:
> 
> xfs_freeze -f /scratch
> sync
> echo platform > /sys/power/disk
> echo disk > /sys/power/state
> xfs_freeze -u /scratch
> 
> Which should work (actually it should work without the sync/xfs_freeze too).
> 
> So to debug the problem I'd like to minimally extend this process rather than 
> replace it with another approach.

Well, this is not entirely "another approach".  Only the saving of the image is
done differently, the rest is the same.

> I take it there isn't an 'echo y > /sys/power/do_image_checksum'?

No, there is not anything like that.

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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