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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I built a Vivid test kernel with the backport from Andy Whitcroft.  The
test kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1520427/

Can you test this kernel and see if it resolves this bug?

Thanks in advance!

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https://bugs.launchpad.net/bugs/1520427

Title:
   drm/fbdev: Return -EBUSY when oopsing

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  Fix Released

Bug description:
  Issue: 
  Between upstream kernel v3.19 to v4.2,when Intel SMEP/SMAP protection was triggered by some wild function call or data access,  the screen would be frozen and never come back,but the system does not hang.

  Generally, an SMEP/SMAP violation should cause the involved process
  killed, an oops from page fault exception generated to the syslog, and
  the system survived.

  Fix:
  One patch from 4.3 kernel fix this issue
  commit c50bfd08d60cefbe1714c4a53b1c325982858549
  Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
  Date:   Tue Jul 28 13:18:40 2015 +0200

      drm/fbdev: Return -EBUSY when oopsing

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