linux-kernel - Re: 2.6.25-rc6 regression

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Date:	Sun, 13 Apr 2008 10:53:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	Soeren Sonnenburg <kernel@....de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.25-rc6 regression - hang on resume

On Sat 2008-04-12 09:27:42, Soeren Sonnenburg wrote:
> On Fri, 2008-04-11 at 23:04 +0200, Pavel Machek wrote:
> > On Fri 2008-04-04 08:31:29, Soeren Sonnenburg wrote:
> > > On Fri, 2008-04-04 at 01:22 +0200, Rafael J. Wysocki wrote:
> > > > The following report is on the current list of known regressions
> > > > from 2.6.24.  Please verify if the issue is still present in the
> > > > mainline.
> > > > 
> > > > 
> > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=10319
> > > > Subject		: 2.6.25-rc6 regression - hang on resume
> > > > Submitter	: Soeren Sonnenburg <kernel@....de>
> > > > Date		: 2008-03-25 04:44 (10 days old)
> > > 
> > > Yes. The machine resumes and display stays black using s2ram -f -p
> > > (blindly typing reboot etc on keyboard does what is expected). However
> > > display comes back on 2.6.24.
> > 
> > Could you get us any debugging output from s2ram? Or maybe even strace
> > it in both working and broken case, and comparing them? (You may want
> > to disable randomization so that results are comparable).
> 
> I did on 2.6.24
> 
> strace -ff s2ram >s2ram24.trace 2>&1
> 
> and .25
> 
> ???strace -ff s2ram >s2ram25.trace 2>&1
> 
> with the .24 bringing the display back and .25 not. Files are here
> 
> http://nn7.de/debugging/s2ram24.trace.bz2
> ???http://nn7.de/debugging/s2ram25.trace.bz2

Hmm: 

/sys/bus/pci/devices/0000:00:1b.0/irq

contains 21 in one case and 22 in another... as do other
interrupts. Is that expected? Can you post /proc/interrupts for both
versions?

Hmm, big part of trace is:

vm86old(0xb7f76c8c)                     = -1 ENOSYS (Function not
implemented)
vm86old(0xb7f76c8c)                     = -1 ENOSYS (Function not
implemented)

...I wonder why we do it so many times?

And here's the difference. .25 says:

vm86old(0xb809ac8c)                     = -1 ENOSYS (Function not
implemented)
vm86old(0xb809ac8c)                     = -1 ENOSYS (Function not
implemented)
Error: something went wrong performing real mode call
open("/sys/class/graphics",
O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|0x80000) = -1 ENOENT (No
such file or directory)
open("/dev/tty", O_RDWR|O_LARGEFILE)    = 6
ioctl(6, KDGKBTYPE, 0xbfae8887)         = 0

...can you perhaps add printf-s to s2ram to find out what changed?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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