[Bug 97779] New: [BDW GPU hang] stuck on render ring, always reproducible

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97779

            Bug ID: 97779
           Summary: [BDW GPU hang] stuck on render ring, always
                    reproducible
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: regwz at seznam.cz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BDW
     i915 features: GPU hang

Created attachment 126466
  --> https://bugs.freedesktop.org/attachment.cgi?id=126466&action=edit
gpu crash dump

System environment:
-- system architecture: 64-bit
-- xf86-video-intel: 1:2.99.917+703+g15c5ff1-1
-- xserver: 1.18.4
-- mesa: 12.1.0-devel (git-2da15a3)
-- llvm: 4.0.0svn_r281203
-- libdrm: 2.4.70
-- kernel: drm-intel-nightly 4.8.0 commit
3015dc173b34795d5bcf8fed4d7ce4709914a88f
-- chromium: 53.0.2785.101
-- Linux distribution: Arch Linux
-- Machine or mobo model: Lenovo Thinkpad Edge E550 20DF004PMC
-- Processor: Intel i5-5200U
-- GPU: Intel(R) HD Graphics 5500 (Broadwell GT2)
-- Display connector: eDP

Reproducing steps:
        1. open Chromium and navigate to the following link:
https://www.artstation.com/embed/3346607 (source:
https://playrust.com/devblog-125/)
        2. click the play button in the middle of the screen
        3. GPU hangs before the object is displayed


Additional info:
        - tested after a cold boot
        - hang occurs every time (after a cold boot and after every GPU reset
due to a hang)
        - /proc/sys/kernel/tainted = 0 (no non-GPL or out-of-tree modules were
loaded)
        - also works under Firefox (both chromium and firefox have WebGL
acceleration enabled)
        - the bug is also present on kernel 4.7.3 and mesa 12.0.2
        - if intel_iommu is on, the PC may freeze completely
        - DRI3 and SNA is enabled, but the hang also occurs under DRI2 / UXA
and the modesetting driver

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