[Bug 91708] Tonga boots to terminal with drm-next-4.3, va conflict

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91708

            Bug ID: 91708
           Summary: Tonga boots to terminal with drm-next-4.3, va conflict
           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: master.homer at gmail.com

Created attachment 117829
  --> https://bugs.freedesktop.org/attachment.cgi?id=117829&action=edit
Kernel log when failing to boot normally

I've been having problems booting when using a self-compiled kernel of the
drm-next-4.3 branch from the agd5f repo. The amdgpu kernel driver complains
that some va (virtual address?) conflicts with another, which makes it boot to
a terminal.
You can see the conflict in the kernel log:
Aug 20 22:29:14 homer-desktop kernel: [    6.762949] amdgpu 0000:01:00.0: bo
ffff880620b34800 va 0x0000100000-0x0000100400 conflict with
0x0000100000-0x0000100400
Aug 20 22:29:14 homer-desktop kernel: [    6.763693] amdgpu 0000:01:00.0: bo
ffff880620b34800 va 0x0000100000-0x0000100400 conflict with
0x0000100000-0x0000100400
Aug 20 22:29:14 homer-desktop kernel: [    6.764357] amdgpu 0000:01:00.0: bo
ffff880620b34800 va 0x0000100000-0x0000100400 conflict with
0x0000100000-0x0000100400
Aug 20 22:29:14 homer-desktop kernel: [    6.765032] amdgpu 0000:01:00.0: bo
ffff880620b34800 va 0x0000100000-0x0000100400 conflict with
0x0000100000-0x0000100400

I do not have these problems when using a self-compiled kernel from the
drm-next-4.2 or drm-fixes-4.2 branch, so something must have changed from 4.2
to 4.3 that causes the conflict.

Using a Radeon R9 285 (TONGA) on Kubuntu vivid with mesa 11 from the oibaf ppa
and a self-compiled xf86-video-amdgpu.

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