[Bug 101294] radeonsi minecraft forge splash freeze since 17.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101294

            Bug ID: 101294
           Summary: radeonsi minecraft forge splash freeze since 17.1
           Product: Mesa
           Version: 17.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tobi291019 at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Launching Minecraft with Forge installed (vanilla is fine, only happens with
the splash screen enabled) often causes a glSwapBuffers to never return and
spin on a single cpu core.

The freeze seems to always occur right after the texture atlas was created (can
be seen in log) and similarly on the same step on the splash itself, so it is
possible that this is some interaction between the splash rendering and loading
resources.

The rest of the system continues to run fine and running SIGKILL is enough to
stop the process (Other OpenGL-based applications continue function as
expected).

Running on Arch Linux, with Mesa 17.1.0, OpenJDK 8.u121-1 with an AMD Radeon
RX480 (8 GB) and a custom compiled Linux 4.11.3 kernel (Based linux-zen package
with ACS override).

This has happened on older kernel versions as well and the exact Minecraft and
Forge versions do not seem to matter (beside that it is at least Minecraft 1.7,
which is when that splash screen got added).

I have also observed a very similar freeze (spinning on single core, no
system-wide effects) with QupZilla (Qt 5.8, WebEngine), however this is very
rare and I could not get any specific info on it. No other programs seem
affected.

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