Re: [Bug #13644] hibernation/swsusp lockup due to acpi-cpufreq

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Tuesday 30 June 2009, Johannes Stezenbach wrote:
> On Mon, Jun 29, 2009 at 02:31:01AM +0200, Rafael J. Wysocki wrote:
> > 
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13644
> > Subject		: hibernation/swsusp lockup due to acpi-cpufreq
> > Submitter	: Johannes Stezenbach <js@sig21.net>
> > Date		: 2009-06-16 01:27 (13 days old)
> > References	: http://lkml.org/lkml/2009/6/15/630
> > Handled-By	: Rafael J. Wysocki <rjw@sisk.pl>
> 
> I tested v2.6.31-rc1-228-g2bfdd79 and the bug is still there.
> It actually got worse, the local_irq_save/restore workaround
> in kernel/up-c (http://lkml.org/lkml/2009/6/16/333) doesn't fix it
> anymore, it hangs at suspend before writing out the image.
> 
> With the up.c workaround (including a
> WARN_ON_ONCE(irqs_disabled() && !oops_in_progress);)
> applied and no_console_suspend I captured the attached
> output using a crappy webcam.  (Without the workaround
> there is a huge spew of warnings about irqs enabled
> unexpectedly.)  I guess the interesting part is
> 
>   pm_op(): pci_pm_thaw returns -16
>   PM: Device 0000:00:00.0 failed to thaw: error -16

Hmm, it looks like we fail to thaw the host bridge.

> (PCI info is in http://lkml.org/lkml/2009/6/15/630)

Well, thanks for the update.  I'll do my best to fix the cpufreq suspend
before 2.6.31 final.

Best,
Rafael