On the face of it, it looks like a memory ordering issue. It would be
interesting if you could give the drm-intel-nightly kernel from
ppa:mainline a test.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Incomplete => Confirmed

** Summary changed:

- [q35] False GPU lockup  EIR: 0x00000010 PGTBL_ER: 0x00000002 IPEHR: 0x02000000
+ [q35] False GPU lockup  EIR: 0x00000010 PGTBL_ER: 0x00000002 -- invalid PTE 
for host access

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https://bugs.launchpad.net/bugs/1162151

Title:
  [q35] False GPU lockup  EIR: 0x00000010 PGTBL_ER: 0x00000002 --
  invalid PTE for host access

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