[Bug 104743] New: i915_gem_object_flush_for_display : BUG: unable to handle kernel NULL pointer dereference/BUG: unable to handle kernel paging request

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104743

            Bug ID: 104743
           Summary: i915_gem_object_flush_for_display : BUG: unable to
                    handle kernel NULL pointer dereference/BUG: unable to
                    handle kernel paging request
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dmiller150 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 136909
  --> https://bugs.freedesktop.org/attachment.cgi?id=136909&action=edit
paging request stack

Running a Lenovo T570 with Intel HD Graphics 520 I get a kernel panic due to a
kernel paging request.

This usually happens when Firefox or Chrome and a terminal window
(xfce-terminal) is open. I could be compiling or could be doing other command
line jobs when the system freezes. The attached log is after I enabled
VGA_SWITCHEROO=y. With VGA_SWITCHEROO=n, I get a null pointer. Stack trace will
be attached shortly. I believe these are the same issue.

I have used the same Linux build on a T540p with an Intel  4th Gen Core
Integrated Graphics with no issues.

This has not happen so far with 4.14.14

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