[Bug 98713] New: [i965] GPU hang freezes the GUI.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98713

            Bug ID: 98713
           Summary: [i965] GPU hang freezes the GUI.
           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: Bjorn at xn--rombobjrn-67a.se
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127961
  --> https://bugs.freedesktop.org/attachment.cgi?id=127961&action=edit
/sys/class/drm/card0/error

The whole GUI sometimes freezes permanently. The display shows no reactions to
any events until I reboot the computer. Logging in by SSH I can see that the OS
is at least partially working. Network traffic flows and I can read files. When
I kill processes most of them terminate, but the images of their windows remain
unchanged on the display. Some processes linger as zombies. When I run "reboot"
the SSH session ends, and I can't log in again, but the system does not reboot.
Only a hardware reset reboots the computer.

I don't have a reliable way of triggering a freeze, but it happens only when
something is changing in the GUI, often when I resize a window or open a new
window. It has never happened when I wasn't working on the local console. When
opening a new window it looks like it's not quite done drawing the window
decorations when it freezes.

The following appears in the system log:

Nov 13 20:05:36 hactar kernel: [drm] stuck on render ring
Nov 13 20:05:36 hactar kernel: [drm] GPU HANG: ecode 4:0:0x00ba6937, in Xorg
[1264], reason: Engine(s) hung, action: reset
Nov 13 20:05:36 hactar kernel: [drm] GPU hangs can indicate a bug anywhere in
the entire gfx stack, including userspace.
Nov 13 20:05:36 hactar kernel: [drm] Please file a _new_ bug report on
bugs.freedesktop.org against DRI -> DRM/Intel
Nov 13 20:05:36 hactar kernel: [drm] drm/i915 developers can then reassign to
the right component if it's not a kernel issue.
Nov 13 20:05:36 hactar kernel: [drm] The gpu crash dump is required to analyze
gpu hangs, so please always attach it.
Nov 13 20:05:36 hactar kernel: [drm] GPU crash dump saved to
/sys/class/drm/card0/error

architecture: x86-64
chipset: G35
motherboard: Asus P5E-V HDMI 
display connector: HDMI
distribution: Fedora 23

The permanent GUI freezes happen with Linux 4.6 and 4.7. Today it happened with
Fedora's kernel-4.7.9-100.fc23. They do not happen with kernel-4.5.7-202.fc23.

Before Linux 4.6 the GUI would only freeze for a second or so. Then the screen
went black for a moment, and then everything worked normally again except that
the mouse pointer was invisible. To get the pointer back I had to lock and then
unlock the console. This also happened only when something was changing in the
GUI, often when I resized a window. Those symptoms began when I upgraded from
Fedora 21 to Fedora 23, and continued until the first 4.6 kernel.

Other currently installed packages:

xorg-x11-server-Xorg-1.18.3-3.fc23
xorg-x11-drv-intel-2.99.917-19.20151206.fc23
mesa-dri-drivers-11.1.0-4.20151218.fc23
libdrm-2.4.66-1.fc23

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