linux-kernel - Re: 2.6.25-rc2 regression

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Date:	Fri, 22 Feb 2008 16:56:28 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Soeren Sonnenburg <kernel@....de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: 2.6.25-rc2 regression - hang on suspend

On Friday, 22 of February 2008, Soeren Sonnenburg wrote:
> On Fri, 2008-02-22 at 00:06 +0100, Rafael J. Wysocki wrote: 
> > On Thursday, 21 of February 2008, Soeren Sonnenburg wrote:
> > > On Thu, 2008-02-21 at 01:31 +0100, Rafael J. Wysocki wrote:
> > > > On Wednesday, 20 of February 2008, Soeren Sonnenburg wrote:
> > > > > On Wed, 2008-02-20 at 00:50 +0100, Rafael J. Wysocki wrote:
> [...] 
> > > Using echo none >/sys/power/pm_test and then
> > > echo mem >/sys/power/state I see it hang on ata1 errors again. Waiting
> > > about 10-30 seconds it progresses further and finally arrives at 
> > > 
> > > CPU0 attaching NULL sched-domain
> > > CPU1 attaching NULL sched-domain
> > > 
> > > then hangs.
> > 
> > Please see if compiling the kernel with CONFIG_SMP unset makes suspend
> > work.
> 
> *Argh*, this bug is not behaving nicely :( Whatever happened,
> git-current now suspends correctly with and without CONFIG_SMP  and all
> may CONFIG_PREEMPT_RCU=y and CONFIG_CLASSIC_RCU=y attempts. Also no sata
> errors anymore.
> 
> However it is not reliably waking up (at least when all of the above
> except CLASSIC_RCU is on). Sometimes the display remains black on the
> console, but X still works and sometimes it hangs completely on resume.

I have created the Bugzilla entry at http://bugzilla.kernel.org/show_bug.cgi?id=10065
for this issue.  Please add yourself to the CC list in there and update it with
any new findings.

> Also when compiling these many kernels via make -j4 I noted that I could
> hardly move the mouse / use the keyboard, but saw random jumps and
> key-repetitions...

This last bit is most likely a scheduler issue.  Do you have CONFIG_GROUP_SCHED
set by chance?  If you do, please try to unset it and see if that helps.

Thanks,
Rafael
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