linux-kernel - Re: [linux-lvm] 2.6.22-rc4 XFS fails after hibernate/resume

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Date:	Mon, 18 Jun 2007 20:14:06 +0100
From:	David Greaves <david@...eaves.com>
To:	David Chinner <dgc@....com>
Cc:	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-rc4 XFS fails after hibernate/resume

OK, just an quick ack

When I resumed tonight (having done a freeze/thaw over the suspend) some libata 
errors threw up during the resume and there was an eventual hard hang. Maybe I 
spoke to soon?

I'm going to have to do some more testing...

David Chinner wrote:
> On Mon, Jun 18, 2007 at 08:49:34AM +0100, David Greaves wrote:
>> David Greaves wrote:
>> So doing:
>> xfs_freeze -f /scratch
>> sync
>> echo platform > /sys/power/disk
>> echo disk > /sys/power/state
>> # resume
>> xfs_freeze -u /scratch
>>
>> Works (for now - more usage testing tonight)
> 
> Verrry interesting.
Good :)


> What you were seeing was an XFS shutdown occurring because the free space
> btree was corrupted. IOWs, the process of suspend/resume has resulted
> in either bad data being written to disk, the correct data not being
> written to disk or the cached block being corrupted in memory.
That's the kind of thing I was suspecting, yes.

> If you run xfs_check on the filesystem after it has shut down after a resume,
> can you tell us if it reports on-disk corruption? Note: do not run xfs_repair
> to check this - it does not check the free space btrees; instead it simply
> rebuilds them from scratch. If xfs_check reports an error, then run xfs_repair
> to fix it up.
OK, I can try this tonight...

> FWIW, I'm on record stating that "sync" is not sufficient to quiesce an XFS
> filesystem for a suspend/resume to work safely and have argued that the only
> safe thing to do is freeze the filesystem before suspend and thaw it after
> resume. This is why I originally asked you to test that with the other problem
> that you reported. Up until this point in time, there's been no evidence to
> prove either side of the argument......
> 
> Cheers,
> 
> Dave.

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