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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - agd5f drm-next-3.19-wip + Unreal Elemental sometimes = list_add corruption/hung task"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85207#c5">Comment # 5</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - agd5f drm-next-3.19-wip + Unreal Elemental sometimes = list_add corruption/hung task"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85207">bug 85207</a>
              from <span class="vcard"><a class="email" href="mailto:adf.lists@gmail.com" title="Andy Furniss <adf.lists@gmail.com>"> <span class="fn">Andy Furniss</span></a>
</span></b>
        <pre>(In reply to Christian König from <a href="show_bug.cgi?id=85207#c4">comment #4</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=108165" name="attach_108165" title="Possible fix">attachment 108165</a> <a href="attachment.cgi?id=108165&action=edit" title="Possible fix">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=85207&attachment=108165'>[review]</a> [review]
> Possible fix

> Ups! Forgotten to take the VM lock in radeon_gem_va_update_vm. Fix is
> attached.

> Thanks for testing,
> Christian.</span >

I don't know about Elemental as it's far harder to trigger, but first try with
valley produced -

[  156.617954] radeon 0000:01:00.0: GPU fault detected: 146 0x02e83504
[  156.617960] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00010F17
[  156.617961] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x08035004
[  156.617963] VM fault (0x04, vmid 4) at page 69399, read from VGT (53)</pre>
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