[Bug 100792] New: [SKL]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100792

            Bug ID: 100792
           Summary: [SKL]
           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: daniel at quora.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131028
  --> https://bugs.freedesktop.org/attachment.cgi?id=131028&action=edit
Kernel log

Bug description:
Display freeze for ~60s.

System environment:
-- chipset: Skylake
-- system architecture: 64-bit
-- xf86-video-intel: 2:2.99.917+git20160706-1ubuntu1~elementary0.4.1
-- xserver: 1:7.7+13ubuntu3
-- mesa: 12.0.6-0ubuntu0.16.04.1
-- libdrm: 2.4.70-1~ubuntu16.04.1
-- kernel: 4.9.24-040924-generic
-- Linux distribution: Elementary OS based on Ubuntu 16.04.
-- Machine or mobo model: Dell XPS 15 9550
-- Display connector:  Internal eDP1

Reproducing steps:
I experienced this while running a complicated legacy X application.

Additional info:
In another X hang which didn't recover (no extra kernel messages as not a GPU
hang), I saw "blocked rendering commands" in the Xorg log, so could be related.

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