[Bug 97338] Black squares in the Spec Ops: The Line chapter select screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97338

            Bug ID: 97338
           Summary: Black squares in the Spec Ops: The Line chapter select
                    screen
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: daniel at constexpr.org
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 125773
  --> https://bugs.freedesktop.org/attachment.cgi?id=125773&action=edit
Screenshot showing the bug (frame 89)

With radeonsi the chapter select screen in Spec Ops: The Line has black squares
that should not be there. I have not observed this bug elsewhere in the game
(but haven't played through the whole game using radeonsi).

The number of squares increases with a higher texture quality setting. The
number and positions of the squares only changes when the camera moves.

The chapter select screen renders fine using the amdgpu-pro driver - tested
with version 16.30.3.306809 running on the upstream amdgpu kernel module.

Apitrace:
 http://constexpr.org/tmp/SpecOps-radeonsi.trace.xz (70 MiB)

This bug seems to be caused by pixels with NaN values that make it into the
framebuffer and are extended to larger squares by a later post-processing pass:
After draw call 1441551, pixel (875, 573) of the COLOR0 attachment has RGB
components set to NaN.

GPU: R9 380X (tonga)
Kernel: 4.7.0-gentoo
Mesa: git-561fd22
LLVM: r278309

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