[Bug 94934] New: i915: kernel crashes randomly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94934

            Bug ID: 94934
           Summary: i915: kernel crashes randomly
           Product: DRI
           Version: unspecified
          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: rockdrilla at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

System architecture: x86_64.
Kernels:
- 4.4.6-1 (Debian sid/unstable),
- 4.5.1 (own build),
- 4.6.0-rc3 from "drm-intel-nightly", HEAD @ c0a9d3a8bc
Distribution: Debian GNU/Linux sid/unstable
Machine: Acer Aspire E5-571G-5881
Display connector: eDP

GFX stack (Debian sid/unstable):
xorg: 1.18
xserver: 7.7
xf86-video-intel: 2:2.99.917+git20160325-1
mesa: 11.1.2-1
libdrm: 2.4.67-1

---

It seems to be that kernel crashes because of i915 with random uptime and load
average.
The only way to boot and survive after hang is to use boot parameters
"i915.semaphores=1" and "i915.enable_ppgtt=0".

A (fast) way to reproduce bug:
1) open Google Chrome
2) go to video-streaming website (e.g. YouTube)
3) expand video in fullscreen
4) collapse to windowed mode
5) repeat steps 3 and 4 few times ()
Result: system stops responding (even Magic SysRq doesn't work) and last
seconds of sound are repeated at loop.

---

Attachments: none; please go to shared folder on my Google Drive and pick
needed files (they're named accordingly):
drive.google.com/folderview?id=0B6WlgYCtySEQTUhIcnZlMi1YejQ

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