[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

Takashi Iwai <tiwai@suse.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Sound(ALSA)                 |Video(DRI - non Intel)
           Assignee|perex@perex.cz              |drivers_video-dri@kernel-bu
                   |                            |gs.osdl.org

--- Comment #16 from Takashi Iwai <tiwai@suse.de> ---
OK, changing the component to DRI...

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #17 from Alex Deucher <alexdeucher@gmail.com> ---
This might be related to bug 61891 (and related fdo bugs).  In that case,
bbd34fcdd1b201e996235731a7c98fd5197d9e51 caused the regression.  Unfortunately,
I'm not familiar enough with the acpi or hotplug code to really understand
what's going on.

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--- Comment #18 from Takashi Iwai <tiwai@suse.de> ---
Rafael, any clue?

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--- Comment #19 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 119641
  --> https://bugzilla.kernel.org/attachment.cgi?id=119641&action=edit
Dmesg blacklisting snd_hda_intel module only

Just a little more research: blacklisting snd_hda_intel I got this dmesg. A
call trace is called on gpu turn off but I'm able to continue using my laptop
(no lockup). I'll try to make a debug version so that trace is something
useful.

$ uname -r
3.12.6-1-ARCH

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #20 from Joaquín Aramendía <samsagax@gmail.com> ---
I'm not able to compile a debug version, at least not easily. Hope the trace is
helpful as is, if not, please give me some pointers on how to improove it.
Thanks.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #21 from Alex Deucher <alexdeucher@gmail.com> ---
See bug 61891.  Does booting with acpiphp.disable=1 on the kernel command line
in grub help?

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--- Comment #22 from Joaquín Aramendía <samsagax@gmail.com> ---
Thanks for the reply, Alex.
Adding 'acpiphp.disable=1' to bootloader indeed helps.

Tested on
$ uname -r
3.12.6-1-ARCH

Last lines of dmesg shows the Nvidia card is shut down
[   25.473454] hda-intel 0000:01:00.1: Disabling via VGA-switcheroo
[   28.062014] ACPI Warning: \_SB_.PCI0.P0P1.PEGP._DSM: Argument #4 type
mismatch - Found [Integer], ACPI requires [Package] (20130725/nsarguments-95)

And is confirmed by vgaswitcheroo
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
2:DIS-Audio: :Off:0000:01:00.1

Then tested powering on/off with prime and it didn't work. It froze when
calling:
$ DRI_PRIME=1 glxinfo | grep renderer

Couldn't catch the dmesg after that.

Indeed it seems like a duplicate of bug 61891. I can't test the patch proposed
there as it's radeon specific.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #23 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Joaquín Aramendía from comment #22)
> Thanks for the reply, Alex.
> Adding 'acpiphp.disable=1' to bootloader indeed helps.
> 
> Indeed it seems like a duplicate of bug 61891. I can't test the patch
> proposed there as it's radeon specific.

We probably need a similar patch for nouveau and the DSM acpi method.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #24 from Joaquín Aramendía <samsagax@gmail.com> ---
(In reply to Alex Deucher from comment #23)
> We probably need a similar patch for nouveau and the DSM acpi method.

Should I open a new bug report? Or change the title on this one? Let me know. I
can test whatever is necessary

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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Rafael J. Wysocki <rjw@rjwysocki.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #114431|text/x-log                  |text/plain
          mime type|                            |

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #25 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
(In reply to Joaquín Aramendía from comment #24)
> (In reply to Alex Deucher from comment #23)
> > We probably need a similar patch for nouveau and the DSM acpi method.
> 
> Should I open a new bug report? Or change the title on this one? Let me
> know. I can test whatever is necessary

Can you please attach dmesg from the failing kernel without any changes?

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #26 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
Created attachment 120021
  --> https://bugzilla.kernel.org/attachment.cgi?id=120021&action=edit
nouveau: Possible VGA switcheroo problem fix

If this is exactly the same issue as in bug #61891, this (untested) patch on
top of

https://patchwork.kernel.org/patch/3414401/

should work for nouveau.

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--- Comment #27 from Joaquín Aramendía <samsagax@gmail.com> ---
I'll test it tonight. I tried to make a similar code for nouveau but didn't
work.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #28 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120071
  --> https://bugzilla.kernel.org/attachment.cgi?id=120071&action=edit
3.13rc5 patched dmesg

(In reply to Rafael J. Wysocki from comment #26)
> nouveau: Possible VGA switcheroo problem fix
> 
> If this is exactly the same issue as in bug #61891, this (untested) patch on
> top of
> 
> https://patchwork.kernel.org/patch/3414401/
> 
> should work for nouveau.

I could test it after a struggle. This is what I did:

Patched the clean 3.13rc5 tarball with both patches and compiled it. After that
adding the "acpiphp.disable=1" workarround made no difference, so that issue
might be cleared.

To get to at least an interactive system I had to blacklist 'snd_hda_module'
and get into 'multi-user.target' in systemd. X will freeze before I could enter
my password.

I finally could get into tty and run a dmesg. I noticed that nouveau gets
insmod-ed and rmmod-ed once every, roughly, a minute. After two minutes the
system will lock. Unfortunatelly I couldn't catch up the dmesg before that,
'journalctl' got a crippled dmesg from previous boot (this one I'm attaching).
There is a call trace regarding hotplug in there.

In a related issue: I also noticed that the 'acpiphp.disable=1' workarround
won't always work on 3.12.6-ARCH, it will lock X after login. Specially when
the system is recovering from a hard button shutdown (when I have to kill my
laptop with the power button). Sometimes it freezes earlier than X login.
(Possibly a race condition?)

Hope all this helps.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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Rafael J. Wysocki <rjw@rjwysocki.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #29 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
(In reply to Joaquín Aramendía from comment #28)
> Created attachment 120071 [details]
> 3.13rc5 patched dmesg
> 
> (In reply to Rafael J. Wysocki from comment #26)
> > nouveau: Possible VGA switcheroo problem fix
> > 
> > If this is exactly the same issue as in bug #61891, this (untested) patch on
> > top of
> > 
> > https://patchwork.kernel.org/patch/3414401/
> > 
> > should work for nouveau.
> 
> I could test it after a struggle. This is what I did:
> 
> Patched the clean 3.13rc5 tarball with both patches and compiled it. After
> that adding the "acpiphp.disable=1" workarround made no difference, so that
> issue might be cleared.

That's what the patch is for, so it looks like it has worked.

I'll the nouveau workaround to https://patchwork.kernel.org/patch/3414401/
then.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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Joaquín Aramendía <samsagax@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #115771|0                           |1
        is obsolete|                            |
 Attachment #115931|0                           |1
        is obsolete|                            |
 Attachment #119641|0                           |1
        is obsolete|                            |
 Attachment #120071|0                           |1
        is obsolete|                            |

--- Comment #30 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120321
  --> https://bugzilla.kernel.org/attachment.cgi?id=120321&action=edit
dmesg after ACPIPHP patch

A follow-up on this issue:

After applying Rafael's patch, the issue with the lockup is still present.
After booting on 3.13rc5 kernel in 'multi-user.target' I managed to get a full
dmesg.

The nouveau driver seems not to handle vgaswitcheroo well. After being disabled
as DSM call mismatch error suggest, it will lock, after a minute or so it
starts printing this messages:

...
[  123.322051] smeagol kernel: nouveau W[   PFIFO][0000:01:00.0] unknown intr
0x04200000, ch 2
...

Followed by timeout errors:

...
[  129.302814] smeagol kernel: nouveau E[   PFIFO][0000:01:00.0] channel 2
[DRM] unload timeout
...
[  149.888549] smeagol kernel: nouveau W[  BARCTL][0000:01:00.0] flush timeout
...

When the laptop finally responded to Ctrl+Alt+Del then a backtrace appeared
regarding acpi hotplug.

And then nouveau is reloaded again! Just before I had to drown my laptop with
the power button.

...
[  207.138410] smeagol kernel: nouveau  [  DEVICE][0000:01:00.0] BOOT0  :
0x0a8a80b1
[  207.138415] smeagol kernel: nouveau  [  DEVICE][0000:01:00.0] Chipset: GT218
(NVA8)
[  207.138418] smeagol kernel: nouveau  [  DEVICE][0000:01:00.0] Family : NV50
[  207.139892] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] checking
PRAMIN for image...
[  207.188025] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] ... signature
not found
[  207.188030] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] checking PROM
for image...
[  208.466903] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] ... signature
not found
[  208.466907] smeagol kernel: nouveau  [   VBIOS][0000:01:00.0] checking ACPI
for image...

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #31 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
It looks like the ACPIPHP is not sufficient in your case, because it still
tries to remove some devices in response to the event signaled after _DSM
execution.

We'll need some more debug info to figure out what is going on.

Please remove the patches you have applied so far and apply this one instead:

https://patchwork.kernel.org/patch/3416861/

This contains the nouveau part already.

I'll let you know what to apply in addition to that.

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Rafael J. Wysocki <rjw@rjwysocki.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEEDINFO

--- Comment #32 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
First off, please attach the output of acpidump from that machine.

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--- Comment #33 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
Created attachment 120331
  --> https://bugzilla.kernel.org/attachment.cgi?id=120331&action=edit
Debug patch for ACPIPHP

Second. please apply this patch (on top of the one I pointed you to previously)
and try to get a dmesg output analogous to the previous one.

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--- Comment #34 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120361
  --> https://bugzilla.kernel.org/attachment.cgi?id=120361&action=edit
acpidump for Dell Vostro 3500

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #35 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120371
  --> https://bugzilla.kernel.org/attachment.cgi?id=120371&action=edit
dmesg Debug patch

Hope this is what you want

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--- Comment #36 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
Yes, thanks!

It looks like on your system the device having the "switching _DSM" method has
to be marked with no_hotplug.

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           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #120021|0                           |1
        is obsolete|                            |

--- Comment #37 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
Created attachment 120381
  --> https://bugzilla.kernel.org/attachment.cgi?id=120381&action=edit
ACPIPHP / radeon / nouveau: Fix VGA switcheroo problem related to hotplug

Please apply this patch (instead of the ones from comment #31 and #33) and
check if it makes any difference.

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--- Comment #38 from Joaquín Aramendía <samsagax@gmail.com> ---
(In reply to Rafael J. Wysocki from comment #36)
> It looks like on your system the device having the "switching _DSM" method
> has to be marked with no_hotplug.

Indeed, the Nvidia card has a sound card in it that is claimed by the
snd_hda_intel module. That module controls both sound cards.

I'll apply patch in comment #37 and report back.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #39 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120391
  --> https://bugzilla.kernel.org/attachment.cgi?id=120391&action=edit
dmesg after patch from comment #38

Now when I get to the tty the system is at leas responsive. The card is turned
off and doing

# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS-Audio: :Off:0000:01:00.1
2:DIS: :DynOff:0000:01:00.0

I noticed an order change (before 1 was the DIS card, 2 the DIS-Audio).

Then I started to toy with it, tryed

# systemctl isolate graphical.target

And it hanged. So I rebooted and tried again. This time trying a reboot after
checking the vgaswitcheroo status, and it hanged with the attached dmesg. I'm
not able to get into a graphical.target yet.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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--- Comment #40 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
Well, that may be a different error.  It looks like there are no hotplug events
triggered by switcheroo any more which is the purpose of the patch.

Please apply the patch from comment #33 on top of the one in #37 and retest to
verify that the hotplug events are really gone.

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--- Comment #41 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120411
  --> https://bugzilla.kernel.org/attachment.cgi?id=120411&action=edit
dmesg for test on comment #40

Sorry for the delay.
Seems that there are some hotplug events left as per dmesg suggests:

...
[   22.292356] smeagol kernel: ACPI Warning: \_SB_.PCI0.P0P1.PEGP._DSM:
Argument #4 type mismatch - Found [Integer], ACPI requires [Package]
(20131115/nsarguments-95)
[   22.299084] smeagol kernel: acpiphp_glue: hotplug_event: Bus check notify on
\_SB_.PCI0.P0P1
[   22.299087] smeagol kernel: acpiphp_glue: hotplug_event: re-enumerating
slots under \_SB_.PCI0.P0P1
[   22.299093] smeagol kernel: pcieport 0000:00:01.0: acpiphp_check_bridge
[   22.299097] smeagol kernel: video LNXVIDEO:00: no_hotplug set
...

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https://bugzilla.kernel.org/show_bug.cgi?id=64891

--- Comment #42 from Rafael J. Wysocki <rjw@rjwysocki.net> ---
Yes, the event is triggered, but because of the no_hotplug set for LNXVIDEO:00,
it is actually ignored and that's what I meant.  This means that the patch
works as intended and it should take hotplug out of the way for you.

The other issues you're seeing need to be investigated by colleagues who are
more familiar with graphics and audio than I am.

Thanks a lot and happy New Year!

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

--- Comment #43 from Joaquín Aramendía <samsagax@gmail.com> ---
Thanks, Rafael! Hope I get it fixed (or help someone to do it, most likely).
Happy new year.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

--- Comment #44 from Joaquín Aramendía <samsagax@gmail.com> ---
Created attachment 120671
  --> https://bugzilla.kernel.org/attachment.cgi?id=120671&action=edit
Nouveau locked dmesg 3.13rc6 patched

Ok. Then I got 3.13rc6 with the patch from comment #37. Entering
multi-user.target went fine. Then I tried to enter X. Here is the dmesg from
that run. It took me almost 15 minutes of lockup. This time it got to print a
trace. It seems that is only related to nouveau.

Hope this helps

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

--- Comment #45 from Joaquín Aramendía <samsagax@gmail.com> ---
Today I tested mainline kernel with no arguments and I found out that it works
out-of-the-box like a charm. So no more issues related with power on/off nvidia
card. I'll mark this as fixed.

Thanks to all.

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[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

Tommaso Falchi Delitala <volalto86@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |volalto86@gmail.com

--- Comment #46 from Tommaso Falchi Delitala <volalto86@gmail.com> ---
Created attachment 181501
  --> https://bugzilla.kernel.org/attachment.cgi?id=181501&action=edit
dmesg showing lockpuos (radeon off)

I still experience lockups related to audio with discrete card disabled via
vgaswitcheroo. Moreover the systems hangs at shutdown.

Kernel 4.0.6-1-ARCH
AMD Mobility Radeon HD5470 + intel integrated.


# cat /sys/kernel/debug/vgaswitcheroo/switch 
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
2:DIS-Audio: :Off:0000:01:00.1

Interesting dmesg print:

snd_hda_intel 0000:01:00.1: Disabling via VGA-switcheroo
snd_hda_intel 0000:01:00.1: Cannot lock devices!
INFO: task kworker/u16:0:6 blocked for more than 120 seconds.
      Tainted: G        W       4.0.6-1-ARCH #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u16:0   D ffff880132fd7ca8     0     6      2 0x00000000
Workqueue: hd-audio1 hdmi_repoll_eld [snd_hda_codec_hdmi]


See complete dmesg in attachment.

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