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

[bugzilla-daemon at bugzilla.kernel.org]

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 at kernel-bugs.osdl.org
          Reporter: bugs-a17 at 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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