linux-kernel - Re: 2.6.22-rc3 hibernate(?) fails totally

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Message-ID: <4667DE2D.6050903@dgreaves.com>
Date:	Thu, 07 Jun 2007 11:30:05 +0100
From:	David Greaves <david@...eaves.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, xfs@....sgi.com,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.osdl.org>, Neil Brown <neilb@...e.de>
Subject: Re: 2.6.22-rc3 hibernate(?) fails totally - regression (xfs on raid6)

Tejun Heo wrote:
> Hello,
> 
> David Greaves wrote:
>> Just to be clear. This problem is where my system won't resume after s2d
>> unless I umount my xfs over raid6 filesystem.
> 
> This is really weird.  I don't see how xfs mount can affect this at all.
Indeed.
It does :)

> How hard does the machine freeze?  Can you use sysrq?  If so, please
> dump sysrq-t.
I suspect there is a problem writing to the consoles...

I recompiled (rc4+patch) with sysrq support, suspended, resumed and tried 
sysrq-t but got no output.

I *can* change VTs and see the various login prompts, bitmap messages and the 
console messages. Caps/Num lock lights work.

Fearing incompetence I tried sysrq-s sysrq-u sysrq-b and got a reboot so sysrq 
is OK.

Any suggestions on how to see more? Or what to try next?

Any other kernel debug options to set?

David
PS Back in a couple of hours...


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