[Bug 205853] New: amdgpu kernel bug: kernel null pointer dereference

[Bug 205853] New: amdgpu kernel bug: kernel null pointer dereference

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205853

            Bug ID: 205853
           Summary: amdgpu kernel bug: kernel null pointer dereference
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: janpieter.sollie@dommel.be
        Regression: No

Created attachment 286277
  --> https://bugzilla.kernel.org/attachment.cgi?id=286277&action=edit
dmesg of kernel 5.4.2

possible duplicate of #204181, but as they are talking about X software, and I
don't even have an xorg setup (issue happens at boot, device is only present
for opencl software), I decided to file a new one:
AMDGPU kernel NULL pointer dereference, address: 0000000000000d71
using fiji device
lspci, dmesg and .config attached.

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[Bug 205853] amdgpu kernel bug: kernel null pointer dereference

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205853

--- Comment #1 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
Created attachment 286279
  --> https://bugzilla.kernel.org/attachment.cgi?id=286279&action=edit
lspci -v output

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[Bug 205853] amdgpu kernel bug: kernel null pointer dereference

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205853

--- Comment #2 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
Created attachment 286281
  --> https://bugzilla.kernel.org/attachment.cgi?id=286281&action=edit
kernel config file

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[Bug 205853] amdgpu kernel bug: kernel null pointer dereference

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205853

--- Comment #3 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
the issue seems to be in the DC driver: booting the amdgpu kernel module with
"dc=0" reduces the output to:
========================
[    7.050414] amdgpu 0000:0a:00.0: [drm:amdgpu_ib_ring_tests [amdgpu]] *ERROR*
IB test failed on uvd (-110).
[    7.151761] [drm:process_one_work] *ERROR* ib ring test failed (-110).
========================

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[Bug 205853] amdgpu kernel bug: kernel null pointer dereference

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205853

--- Comment #4 from Janpieter Sollie (janpieter.sollie@dommel.be) ---
Created attachment 286571
  --> https://bugzilla.kernel.org/attachment.cgi?id=286571&action=edit
working .config

this modified .config file allows the DC driver to get things up and running;
however: as the IB ring error still exists, I'll have to look further into
that, but that's another bug

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[Bug 205853] amdgpu kernel bug: kernel null pointer dereference

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205853

Janpieter Sollie (janpieter.sollie@dommel.be) changed:

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

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