[Bug 108850] New: i915 "kernel NULL pointer dereference" in kernel-4.18.20

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108850

            Bug ID: 108850
           Summary: i915 "kernel NULL pointer dereference" in
                    kernel-4.18.20
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: fishpool at tesco.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 142599
  --> https://bugs.freedesktop.org/attachment.cgi?id=142599&action=edit
/var/log/dmesg

On boot up with kernel-4.18.2 the screen freezes with the 
last line on the console showing  :-
  "fb: switching to inteldrmfb from VESA VGA"

The rest of the boot continues with partitions mounted, etc, and
dmesg saved to log file.

Was ok with kernel-4.18.16 (have not tried the ones in between)
and is also ok with 4.19.3 and 4.14.82.

This is repeatable, though on one occasion I got and extra line
on the console (of normal usb related information).

------------------------------------
Hardware:
  Asus P7H55-M SI with Intel Core i5 processor
  and Integrated Graphics [i915 driver].

Distro: Slackware-14.2, but with newer kernel.
------------------------------------

Will attach dmesg extract including trace.

I appreciate 4.18.y is going EOL so this is all a bit academic, 
but I am reporting it in case it affects anything else.

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