[Bug 199653] New: [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[Bug 199653] New: [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

            Bug ID: 199653
           Summary: [AMDGPU][DC] BUG: unable to handle kernel NULL pointer
                    dereference (trace decoded)
           Product: Drivers
           Version: 2.5
    Kernel Version: drm-next-4.18-wip (agd5f, AMDGPU)
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: marcus.husar@gmail.com
        Regression: No

Created attachment 275827
  --> https://bugzilla.kernel.org/attachment.cgi?id=275827&action=edit
Call trace of crash decoded with decode_stacktrace.sh

kernel: BUG: unable to handle kernel NULL pointer dereference at
00000000000002e4

This happens multiple times a day on my machine. It leads to a complete system
freeze. Yesterday I was lucky and got a stack trace.

It mostly happens browsing the web with Firefox (WebRender enabled, XWayland,
Gnome-Shell) when the cursor moves or rotates. But it can happen anywhere and
anytime.

The used kernel is from branch drm-next-4.18-wip@92fb374 of Alex Deucher, AMD
(agd5f). See: git://people.freedesktop.org/~agd5f/linux.

My machine:
 * Hardware name: Acer Swift SF315-41/Becks_RR, BIOS V1.04 01/09/2018
 * Ryzen Mobile 2500U
 * Firmware: VCN: 1.73 (latest available version)
 * My kernel is tainted because the i2c designware driver emits a warning
during
   boot. This should be unrelated to AMDGPU
   (see attachment i2c_designware_trace.txt).

Please ask if anything else is needed.

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #1 from Marcus Husar (marcus.husar@gmail.com) ---
Created attachment 275829
  --> https://bugzilla.kernel.org/attachment.cgi?id=275829&action=edit
Original call trace of crash

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #2 from Marcus Husar (marcus.husar@gmail.com) ---
Created attachment 275831
  --> https://bugzilla.kernel.org/attachment.cgi?id=275831&action=edit
Journal log with amdgpu.dc_log=1 drm.debug=6

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #3 from Marcus Husar (marcus.husar@gmail.com) ---
Created attachment 275833
  --> https://bugzilla.kernel.org/attachment.cgi?id=275833&action=edit
Call trace of i2c designware warning (taints kernel)

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

James Le Cuirot (chewi@gentoo.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |chewi@gentoo.org

--- Comment #4 from James Le Cuirot (chewi@gentoo.org) ---
I have almost exactly the same hardware but the Ryzen 7 (2700U) version. I also
get multiple daily freezes. Many thanks for the additional info, I never
managed to get any. I did try kdump but it never triggers, even when forcing a
kernel panic. I'm now running OpenSUSE 15.0 with kernels from the "stable"
repository (currently 4.16.12-1.g39c7522) and recent Mesa 18.2 prerelease
builds.

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #5 from James Le Cuirot (chewi@gentoo.org) ---
After seeing amdgpu.vm_update_mode=3 mentioned in bug #199749, I tried it but
it didn't help.

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

Andrey Grodzovsky (andrey.grodzovsky@amd.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrey.grodzovsky@amd.com

--- Comment #6 from Andrey Grodzovsky (andrey.grodzovsky@amd.com) ---
Those two are unrelated bugs.

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #7 from James Le Cuirot (chewi@gentoo.org) ---
I had high hopes for 4.18-rc1 but alas it froze after a few hours. :( I know
having the latest firmware is important so I have that too. These OpenSUSE
packages (some unofficial) are installed:

kernel-default-4.18.rc1-1.1.gfa9e020
kernel-firmware-20180606-35.1
libdrm2-2.4.99~git20180511-lp150.1.1
Mesa-18.2.0~git20180619-lp150.16.1

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #8 from James Le Cuirot (chewi@gentoo.org) ---
OP also filed a freedesktop.org bug report with more information.

https://bugs.freedesktop.org/104817

Still the same with 4.18-rc4. :(

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #9 from Marcus Husar (marcus.husar@gmail.com) ---
From the freedesktop.org bug:

It seems to me that this is in fact a CPU related problem. Since July 25 I
don’t have any problems. My system is pretty stable. What helped was to add
idle=nomwait to my GRUB command line. This has fixed those problems for me.

Please try to add idle=nomwait to your GRUB command line. I think this bug can
be closed.

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

--- Comment #10 from James Le Cuirot (chewi@gentoo.org) ---
I added idle=nomwait recently and that has fixed it for me too. I thought I had
already tried this, not sure, but perhaps there were two issues and the other
has since been fixed.

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[Bug 199653] [AMDGPU][DC] BUG: unable to handle kernel NULL pointer dereference (trace decoded)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199653

Marcus Husar (marcus.husar@gmail.com) changed:

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

--- Comment #11 from Marcus Husar (marcus.husar@gmail.com) ---
See comment #9 and #10. Kernel parameter idle=nomwait fixed this bug for me. It
seems to be a CPU related problem.

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