[Bug 84836] New: VERDE lockup with Unigine Valley/Heaven if ARB_sample_shading is enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84836

            Bug ID: 84836
           Summary: VERDE lockup with Unigine Valley/Heaven if
                    ARB_sample_shading is enabled
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: alexander at tsoy.me

Created attachment 107614
  --> https://bugs.freedesktop.org/attachment.cgi?id=107614&action=edit
dmesg output

Unigine Valley 1.0 and Heaven 4.0 cause VERDE GPU lockup when
ARB_sample_shading is enabled. With kernel 3.14.19 I got immediate lockup.
3.14.20 allows Valley and Heaven to run for up to 1 min. GPU fails to resume
after lockup, screen becomes corrupted and I need to reboot the system.

If I disable ARB_sample_shading (via env variable
MESA_EXTENSION_OVERRIDE=-GL_ARB_sample_shading) then VERDE GPU do not hang at
all (currently valley is running on my system for more than two hours without
lockups).

I also have BONAIRE GPU and it does not hang.


Software versions:

kernel-3.14.20
mesa-10.3.0
llvm-3.5
xf86-video-ati 7.4.0
libdrm-2.4.56

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