[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104736

            Bug ID: 104736
           Summary: Kernel panic with agd5's drm-next-4.17-wip &
                    GFX8/Polaris10/Ellesmere/Rx-480-8GiB
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: robink at creosotehill.org

Created attachment 136904
  --> https://bugs.freedesktop.org/attachment.cgi?id=136904&action=edit
Serial kernel console for Panic/BUG/OOPS bug on Kaveri+GFX8

Hi-
    I'm having issues with bringing up a kennel on an AMD Kaveri (A10-7850K w/
R7 iGPU disabled) using a Radeon Rx 480 8GiB.  I'm using (at the time of this
writing) the latest commit from agd5f's drm-next-4.17-wip branch (commit
006a62b26fbb0b7dcd8061f83889e0514ea42d17 ('drm/ttm: Don't unreserve swapped BOs
that were previously reserved')).
    When bringing up the kernel, it acts like it's initializing the
(DisplayPort-connected) display, but then the screen blacks out and the display
finally goes to sleep.  I've attached a kernel log (grabbed from a serial
connection (the kernel panics too soon to bring up the various network devices,
and thus the network console)), which hopefully has enough verbosity to be
useful.  It's also available at
https://gist.github.com/Haifen/f783d5f6b2ab3d30805d9f5315b7c675
    Please let me know if there's any more information you require.

        -Robin K.

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