[Bug 111139] linux 5.2: rare NULL pointer dereference when SteamVR idles

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111139

            Bug ID: 111139
           Summary: linux 5.2: rare NULL pointer dereference when SteamVR
                    idles
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: haagch at frickel.club

Created attachment 144791
  --> https://bugs.freedesktop.org/attachment.cgi?id=144791&action=edit
dmesg with null pointer dereference

Vega 64, mesa git b68778e6de2, Linux 5.2.

I am relatively sure this started happening with linux 5.2 and that this did
not happen on 5.1.

When SteamVR is idle for a while (i.e. the VR headset is not moved), it stops
rendering to not waste resources.

When it does this, there is a chance that a kernel bug happens, see attached
dmesg.

It does not happen very often, but often enough that I'm relatively sure it
started happening with 5.2.

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