Message-ID: <20171207075508.GA20234@dhcp22.suse.cz>
Date:   Thu, 7 Dec 2017 08:55:08 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Andy Lutomirski <luto@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Linux 4.15-rc2: Regression in resume from ACPI S3

On Wed 06-12-17 13:14:52, Michal Hocko wrote:
> On Mon 04-12-17 14:36:20, Linus Torvalds wrote:
> > On Mon, Dec 4, 2017 at 2:25 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> > >
> > > So far, resume from suspend-to-RAM (ACPI S3) is broken on all of the
> > > systems I have tested, so it is probably safe to assume it to be
> > > broken everywhere.
> > 
> > Oh, it's definitely not broken everywhere, because I use it myself,
> > and was traveling last week due to my mom's bday.
> > 
> > HOWEVER.
> > 
> > Some of the x86 work seems to have broken it for some configurations.
> > In particular, do you have a big "everything enabled" kernel config -
> > particularly lockdep and irqflags tracing enabled?
> > 
> > Andy has a patch, but it hasn't made it to me yet (probably because
> > the x86 people are very busy with the kaiser work):
> > 
> >     https://lkml.org/lkml/2017/11/30/546
> > 
> > (also note his follow-up "fix the commit message" note, but that one
> > doesn't actually affect the code itself).
> 
> merging tip/x86/urgent on top of your tree fixed this problem for me,
> but I am seeing something else
> [  131.711412] ACPI: Preparing to enter system sleep state S3
> [  131.755328] ACPI: EC: event blocked
> [  131.755328] ACPI: EC: EC stopped
> [  131.755328] PM: Saving platform NVS memory
> [  131.755344] Disabling non-boot CPUs ...
> [  131.779330] IRQ 124: no longer affine to CPU1
> [  131.780334] smpboot: CPU 1 is now offline
> [  131.804465] smpboot: CPU 2 is now offline
> [  131.827291] IRQ 122: no longer affine to CPU3
> [  131.827292] IRQ 123: no longer affine to CPU3
> [  131.828293] smpboot: CPU 3 is now offline
> [  131.830991] ACPI: Low-level resume complete
> [  131.831092] ACPI: EC: EC started
> [  131.831093] PM: Restoring platform NVS memory
> [  131.831864] do_IRQ: 0.55 No irq handler for vector
> [  131.831884] Enabling non-boot CPUs ...
> [  131.831909] x86: Booting SMP configuration:
> [  131.831910] smpboot: Booting Node 0 Processor 1 APIC 0x2
> [  131.832913]  cache: parent cpu1 should not be sleeping
> [  131.833058] CPU1 is up
> [  131.833067] smpboot: Booting Node 0 Processor 2 APIC 0x1
> [  131.833864]  cache: parent cpu2 should not be sleeping
> [  131.833983] CPU2 is up
> [  131.833995] smpboot: Booting Node 0 Processor 3 APIC 0x3
> [  131.834776]  cache: parent cpu3 should not be sleeping
> [  131.834923] CPU3 is up
> 
> "No irq handler" part looks a bit scary (maybe related to lost affinity
> messages?) but the following messages look quite as well. Is this
> something known? The system seems to be up and running without any
> visible issues.

Hmm, there is still something bad going on during resume. My laptop
haven't woken up from s2ram this morning. The screen was powered on
but the system hasn't come up.

The last thing that made it into the kernel log on fs is this

Dec  6 19:32:29 tiehlicka kernel: [21898.084685] PM: suspend entry (deep)

which won't tell us much I suspect. I've tried dozen s2ram cycles and it
hasn't reproduced so it smells like a timing issue.
-- 
Michal Hocko
SUSE Labs

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