linux-kernel - Re: [linux-pm] intermittent suspend problem again

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Message-Id: <200911291607.05348.rjw@sisk.pl>
Date:	Sun, 29 Nov 2009 16:07:05 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ferenc Wagner <wferi@...f.hu>
Cc:	linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-netdev@...r.kernel.org
Subject: Re: [linux-pm] intermittent suspend problem again

On Sunday 29 November 2009, Ferenc Wagner wrote:
> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> 
> > On Saturday 28 November 2009, Ferenc Wagner wrote:
> >> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> >> 
> >>> On Wednesday 18 November 2009, Ferenc Wagner wrote:
> >>>
> >>>> Ferenc Wagner <wferi@...f.hu> writes:
> >>>> 
> >>>>> Since I've instrumented s2disk and the hibernation path, no freeze
> >>>>> happened during hibernating the machine.
> >>>> 
> >>>> Not until I removed the delays from hibernation_platform_enter(), which
> >>>> were put there previously to get step-by-step feedback.  Removing them
> >>>> again resulted in a freeze in short course, maybe just two hibernations
> >>>> later.  The instrumentation shows it stuck in dpm_suspend_start(PMSG_HIBERNATE).
> >>>> Does it mean that some device driver is at fault?
> >>>
> >>> A driver or one of the platform hooks.
> >>>
> >>>> I'll check if it always fails at the same point (although tracing into
> >>>> dpm_suspend_start isn't pure fun because of the multitude of devices it
> >>>> loops over).  Is there any way to get printk output from that phase?
> >>>
> >>> Compile with CONFIG_PM_VERBOSE (it does mean exactly that).
> >> 
> >> The last message now was:
> >> 
> >> e100: 0000:02:08.0: hibernate, may wakeup
> >> 
> >> Looks like hibernating the e100 driver is unstable.
> >
> > Can you verify that by trying to hibernate without the e100 driver?
> 
> Not really, as I still can't reliable reproduce the issue.  Since I'm
> running with suspend loglevel = 8, it's happened only twice (in a row),
> with seemingly exact same console output.  Some earlier freezes also
> happened in dpm_suspend_start, at least.  However, I can certainly add
> e100 to SUSPEND_MODULES under /etc/pm/config.d, and continue running
> with that.

That's what I'd do.  In addition to that, you can run multiple
hibernation/resume cycles in a tight loop using the RTC wakealarm.

Thanks,
Rafael
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