[Bug 111198] System hang when running multiple GPU-heavy applications

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=111198

            Bug ID: 111198
           Summary: System hang when running multiple GPU-heavy
                    applications
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: network723@rkmail.ru

OK, this is something I notices long time ago, but never reported it because I
can't imagine a test-case that would reliably reproduce the issue every time.

The problem is that *sometimes* system would hang when you run several
GPU-heavy applications (games) at the same time on a single GPU.
Computer would work fine for hours if you run just one of these programs, but
it may hang if you have two of three of them. I also noticed it may hang if you
use hardware vaapi encoder while running a game. Encoder works just fine under
no GPU load.

When system freezes, there's no screen flickering indicating that GPU driver
tried to reset GPU. Could it be that hang is in driver itself?

This was happening to me with VEGA20 and POLARIS10 hardware, kernel 5.1.x, but
I remember same happening with Polaris on older kernels.

I can't provide any logs at the time, but if you know best way to collect them,
please share.

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