[Mesa-dev] [Bug 105119] Desktop-wide input freeze when vulkan (radv)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105119

            Bug ID: 105119
           Summary: Desktop-wide input freeze when vulkan (radv)
           Product: Mesa
           Version: 17.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: jakub at okonski.org
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 137384
  --> https://bugs.freedesktop.org/attachment.cgi?id=137384&action=edit
trace #1 with long vkDeviceWaitIdle

I'm experimenting with vulkan, and, after my application exits cleanly,
keyboard input is ignored until I switch to another window using my mouse (that
I can still use).

This is not the main problem though, I found a sequence of commands that
triggers a desktop-wide freeze. I can still move my mouse, but windows don't
redraw as far as I can tell. I also cannot focus other windows with
mouse/keyboard, I cannot use ctrl+alt+f[1-9] to jump back to tty. Because I
have a physical tachometer on the GPU, I also noticed that it is being utilized
100%, at least that's what the LEDs say.

I tried doing a vulkan trace and replay, but the replay does not trigger it.
I'm attaching two vktrace files, first one is my original case, where I render
two frames and exit cleanly (or at least try to). Of note is the never-ending
vkDeviceWaitIdle call (it actually does end as soon as I press the power button
on my PC, more on this in a second). The second trace I attached is one where I
only render one frame and then exit the application (cleanly). Interestingly,
in this case there is no failure

So after the desktop is frozen, I can only press the power button, which
immediately exits xorg server, I again see my tty (I launch startx directly
from tty, no GUI login manager). The control is never yielded back to my tty
though, I can see a snippet of xorg logs but the process has not exited (and
the GPU leds show 100% utilisation still).

Mesa, radv 17.3.3, xorg 1.19.6, linux 4.15.3 with RX Vega 64 GPU.

Let me know if there are additional debugging steps I can take, I can also
provide source code for reproduction steps.

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