*** This bug is a duplicate of bug 1680904 ***
    https://bugs.launchpad.net/bugs/1680904

> As an experiment I've disabled hardware acceleration in chrome since
all the traces show the drm module (Direct Rendering Module which is in
charge of hardware acceleration).

FWIW I've been running like this for two weeks and have seen no lockups.

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https://bugs.launchpad.net/bugs/1677673

Title:
  System soft-freezes, BUG: unable to handle kernel NULL pointer
  dereference at 0000000000000018 in journalctl at
  gen8_ppgtt_alloc_page_directories.isra.38+0x115/0x250

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