[Bug 93050] Amdgpu, Tonga "IO_PAGE_FAULT" and "[amdgpu]] *ERROR* amdgpu: ring 0 test failed" result in Kernel Panic

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93050

            Bug ID: 93050
           Summary: Amdgpu, Tonga "IO_PAGE_FAULT" and "[amdgpu]] *ERROR*
                    amdgpu: ring 0 test failed" result in Kernel Panic
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jahnkohl at web.de

Created attachment 120000
  --> https://bugs.freedesktop.org/attachment.cgi?id=120000&action=edit
Logfile

Switched from catalyst to amdgpu, Kernel 4.2 and Kernel 4.3 with powerplay
fixes crash, wenn modesetting is enabled (which just has to be, to get
everything working..) 
When booting without modesetting no Kernel Panic occurs, but just nothing else
works really good...

I'm using Archlinux with mesa/llvm etc build from git.
Kernel 4.2 is Archlinux vanilla kernel, 4.3 is build from
http://cgit.freedesktop.org/~agd5f/linux/?h=amdgpu-powerplay

Log files are attached.I've tried with disabled/enabled Iommu, it think this
Log is with disabled Iommu.

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