linux-kernel - Re: hibernation bug

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Date:	Tue, 16 Dec 2008 22:06:53 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: hibernation bug - swap goes AWOL

On Tuesday, 16 of December 2008, Alan Jenkins wrote:
> This is on 2.6.27-rc9.  I can easily test patches, or a more recent
> kernel version.
> 
> I think I've run across a bug in hibernation.  Steps to reproduce:
> 
> 1) Conspire to ensure insufficient swap space for hibernation
> 2) Attempt to hibernate, and fail
> 3) Attempt to hibernate *again*, and fail
> 4) try swapoff

> Outcome:
> 
> # swapoff /dev/sda6
> swapoff: /dev/sda6: Invalid argument
> # cat /proc/swaps
> Filename                                Type            Size    Used   
> Priority
> /dev/sda6                               partition       1494004 1350564 -1
> 
> Incidentally "swapoff -a" fails silently, which I think is a bug in
> swapoff (i.e. it should report the error).
> 
> I don't see any backtraces in dmesg; the only errors it shows is the
> failure to hibernate
> 
> If I free up some memory and try to hibernate again, I get a different
> error - "Cannot find swap device, try swapon -a.".  Now swapon -a
> doesn't work, but if I target the specific device...
> 
> # swapon /dev/sda6
> # cat /proc/swaps
> Filename                                Type            Size    Used   
> Priority
> /dev/sda6                               partition       1494004 331060  -1
> /dev/sda6                               partition       1494004 0       -2
> 
> Wheee!  Interestingly I can now hibernate and resume.  But it's not
> safe; my desktop session dies horribly.

Well, I'm not sure if the bug is in the hibernate code or in the swap code.

Anyway, please file a bugzilla report about that.

Thanks,
Rafael
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