[Bug 109949] New: Hard lockup (Freeze)/GPU HANG: ecode 9:1:0xfffffffe with Skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109949

            Bug ID: 109949
           Summary: Hard lockup (Freeze)/GPU HANG: ecode 9:1:0xfffffffe
                    with Skylake
           Product: DRI
           Version: DRI 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: borrowck at protonmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143604
  --> https://bugs.freedesktop.org/attachment.cgi?id=143604&action=edit
kernel dmesg before freeze

I am not sure how to 100% reproduce this, but in my case, by opening ~30
chromium tabs with youtube videos running should cause a hard lockup, aka
system/xorg freezes, music hangs too with repeating audio chunks,
sysrq/ping/network/netconsole/ssh doesn't work.

The only dmesg I could recover contained something like this:

[  174.026397] i915 0000:00:02.0: GPU HANG: ecode 9:1:0xfffffffe, in  [0], hang
on rcs0
[  174.026403] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  174.026406] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  174.026407] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  174.026409] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  174.026411] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  174.027425] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  174.028043] i915 0000:00:02.0: Resetting chip for hang on rcs0

Well, I am not exactly sure how I should continue debugging this because it's
basically a hard-lockup.

Note: I am not sure when it started but I've been having this issue for quite
some time (This also occurred with 4.18.x, and perhaps even before that,
although I can't quite remember when it started).

System info:

CPU: Intel i7-6700K (Not overclocked)
Kernel: Linux - 5.0.0-arch1-2-ARCH-02093-g2988dab1bd13 #1 SMP PREEMPT Sat Mar 9
22:56:40 CET 2019 x86_64 GNU/Linux (drm-tip/   
24962f1aef49db97e09c7942157a2dbc973b546b)
Distro: Arch Linux
Display Connector: eDP
chromium: 72.0.3626.121 (with hw accel enabled + intel-hybrid-driver)

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