Re: 2.6.25-rc6 regression - hang on resume

From: Rafael J. Wysocki
Date: Sun Apr 13 2008 - 09:53:51 EST


On Sunday, 13 of April 2008, Pavel Machek wrote:
> 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@xxxxxx>
> > > > > 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?

Well, that looks suspiciously similar to
http://bugzilla.kernel.org/show_bug.cgi?id=10155 .

Thanks,
Rafael
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