[Bug 210739] New: Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[Bug 210739] New: Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

            Bug ID: 210739
           Summary: Regression in 5.10, Oops at
                    amdgpu_connector_dp_detect()
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.10
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: bugs-a17@moonlit-rail.com
        Regression: Yes

Created attachment 294169
  --> https://bugzilla.kernel.org/attachment.cgi?id=294169&action=edit
dmesg from where X11 initializes

Booting into mainline 5.10.1 oopses in the amdgpu module in the routine
amdgpu_connector_dp_detect().  Kernels 5.9.15 and below are not affected.

Full dmesg attached.  Brief snippet of oops:
    BUG: kernel NULL pointer dereference, address: 0000000000000060
    Call Trace:
     amdgpu_connector_dp_detect+0x159/0x320 [amdgpu]
     drm_helper_probe_detect+0x93/0xd0
     drm_helper_probe_single_connector_modes+0x60c/0x7e0
     drm_client_modeset_probe+0x25c/0x13c0
[etc]

The GPU is inbuilt within the AMD A10-7870K (Radeon R7).
At system start:
    modprobe amdgpu clk_support=1
    modprobe radeon clk_support=0
Console output seems to be OK during system initialization.  But as soon as
Xorg starts, the oops occurs, and video output ceases.  System is still
responsive via the network.

The oops locks the video hardware spectacularly.  Neither the BIOS nor pressing
the motherboard <reset> button has any effect.  Only a power-cycle will get
things back to normal.

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

Alex Deucher (alexdeucher@gmail.com) changed:

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

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Fixed with this patch:
https://patchwork.freedesktop.org/patch/408230/
Which will be landing soon.

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

--- Comment #2 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to Alex Deucher from comment #1)
> Fixed with this patch:
> https://patchwork.freedesktop.org/patch/408230/
> Which will be landing soon.

Nevermind, this only applies when amdgpu.dc=1

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

--- Comment #3 from Alex Deucher (alexdeucher@gmail.com) ---
Can you bisect?

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

--- Comment #4 from Kris Karas (bugs-a17@moonlit-rail.com) ---
OK, just finished the bisect.
The errant commit is:
    65bf2cf95d3ade4b56c35b17bb955a64b7f4b019
    "drm/amdgpu: utilize subconnector property for DP through atombios"

I reverted that out of my 5.10.1, and all is happy on my machine.

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

--- Comment #5 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 294203
  --> https://bugzilla.kernel.org/attachment.cgi?id=294203&action=edit
possible fix

I think this patch should fix it.

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

--- Comment #6 from Frank Kruger (fkrueger@mailbox.org) ---
(In reply to Alex Deucher from comment #5)
> Created attachment 294203 [details]
> possible fix
> 
> I think this patch should fix it.

Will the fix be part of 5.10.2? Thx.

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

Kris Karas (bugs-a17@moonlit-rail.com) changed:

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

--- Comment #7 from Kris Karas (bugs-a17@moonlit-rail.com) ---
Tested the patch from comment 5, and I confirm it works as intended.

Thanks, Alex, for the fix!
I'll mark as closed.

Tested-By: Kris Karas <bugs-a17@moonlit-rail.com>

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[Bug 210739] Regression in 5.10, Oops at amdgpu_connector_dp_detect()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=210739

John Shand (jshand2013@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jshand2013@gmail.com

--- Comment #8 from John Shand (jshand2013@gmail.com) ---
Created attachment 294349
  --> https://bugzilla.kernel.org/attachment.cgi?id=294349&action=edit
journalctl for debugging purposes

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