[Bug 70895] New: BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

[Bug 70895] New: BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=70895

          Priority: medium
            Bug ID: 70895
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292]
                    after disable descrete card with switcheroo
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mszpak-5tc4TXWwyLM@public.gmane.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 88154
  --> https://bugs.freedesktop.org/attachment.cgi?id=88154&action=edit
kernel log with stack trace

After disable discrete graphics with:
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

nouveau drivers seems to react:
kernel: [  113.072192] VGA switcheroo: switched nouveau off
Oct 26 16:07:52 localhost kernel: [  113.072208] ACPI Warning:
\_SB_.PCI0.PEGR.GFX0._DSM: Argument #4 type mismatch - Found [Buffer], ACPI
requires [Package] (20130517/nsarguments-95)
kernel: [  113.072350] nouveau  [     DRM] suspending fbcon...
kernel: [  113.072354] nouveau  [     DRM] suspending display...
kernel: [  113.072360] nouveau  [     DRM] unpinning framebuffer(s)...
kernel: [  113.072400] nouveau  [     DRM] evicting buffers...
kernel: [  113.085655] nouveau  [     DRM] waiting for kernel channels to go
idle...
kernel: [  113.085682] nouveau  [     DRM] suspending client object trees...
kernel: [  113.085976] nouveau  [     DRM] suspending kernel object tree...
kernel: [  113.865315] nouveau 0000:01:00.0: power state changed by ACPI to
D3cold

but xrandr --listproviders hangs the whole system with:
kernel: [  324.008068] BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292]

Detailed log with stack trace attached.

System specification:
Asus N43SN
GeForce GT 550M + integrated Intel card using i915 driver (NVidia Optimus)
kernel-3.11.6-200.fc19.x86_64
xorg-x11-drv-nouveau-1.0.9-1.fc19.x86_64
xorg-x11-server-Xorg-1.14.3-1.fc19.x86_64

$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x8e cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
2 outputs: 4 associated providers: 2 name:Intel
Provider 1: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
Provider 2: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau

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[Bug 70895] BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

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https://bugs.freedesktop.org/show_bug.cgi?id=70895

Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugzilla.kernel.org
                   |                            |/show_bug.cgi?id=64891

--- Comment #1 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
AFAICS this is the same issue as the one reported in the kernel bugzilla [1].
Can you try the patch [2] and let us know if you're still having problems.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=64891
[2] https://patchwork.kernel.org/patch/3416861/

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[Bug 70895] BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=70895

--- Comment #2 from Marcin Zajaczkowski <mszpak-5tc4TXWwyLM@public.gmane.org> ---
Hello again. I upgraded my system to Fedora 21 and with 3.17.3-300.fc21.x86_64
I cannot reproduce mentioned issue (with "CPU#0 stuck for 22s").

Unfortunately I have problem with switching a discrete card. By default:
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
does nothing - a discrete card is still in DynPwr state:

$ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynPwr:0000:01:00.0

Booting with nouveau.runpm=0 I have both cards on:
$ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Pwr:0000:01:00.0

and after
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

I have:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0

Looks ok, but I still see 3 providers:
$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x90 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
3 outputs: 5 associated providers: 2 name:Intel
Provider 1: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
Provider 2: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau

and system temperature could suggest that the card is still on. I see no
messages from VGA switcheroo in the system log (as there were in 3.11.6).

When I use (on the second kernel) bbswitch with bumblebee I see only one
provider and the temperature is a few (~6) degrees lower.

Should I close that issue and report another issue?

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[Bug 70895] BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=70895

--- Comment #3 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to Marcin Zajaczkowski from comment #2)
> Hello again. I upgraded my system to Fedora 21 and with
> 3.17.3-300.fc21.x86_64 I cannot reproduce mentioned issue (with "CPU#0 stuck
> for 22s").
> 
> Unfortunately I have problem with switching a discrete card. By default:
> # echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
> does nothing - a discrete card is still in DynPwr state:

That's expected. What's unexpected is that something is keeping a reference to
your GPU which isn't letting it power off. Similar to bug #70875.

> Booting with nouveau.runpm=0 I have both cards on:
> $ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
> 0:IGD:+:Pwr:0000:00:02.0
> 1:DIS: :Pwr:0000:01:00.0
> 
> and after
> # echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
> 
> I have:
> 0:IGD:+:Pwr:0000:00:02.0
> 1:DIS: :Off:0000:01:00.0
> 
> Looks ok, but I still see 3 providers:
> $ xrandr --listproviders
> Providers: number : 3
> Provider 0: id: 0x90 cap: 0xb, Source Output, Sink Output, Sink Offload
> crtcs: 3 outputs: 5 associated providers: 2 name:Intel
> Provider 1: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
> crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
> Provider 2: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
> crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
> 
> and system temperature could suggest that the card is still on. I see no
> messages from VGA switcheroo in the system log (as there were in 3.11.6).

That is odd... not sure what that situation is.

> Should I close that issue and report another issue?

Yes, don't confuse multiple issues into one, it gets unwieldy.

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[Bug 70895] BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

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https://bugs.freedesktop.org/show_bug.cgi?id=70895

Marcin Zajaczkowski <mszpak-5tc4TXWwyLM@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Marcin Zajaczkowski <mszpak-5tc4TXWwyLM@public.gmane.org> ---
Closing as not reproducible with 3.17.3-300.fc21.x86_64.

> That's expected. What's unexpected is that something is keeping a reference
> to your GPU which isn't letting it power off. Similar to bug #70875.

That's also a bug reported by me :).

I created bug 86503 with the problem with keeping the card On when reporting as
Off.

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