[Bug 92184] Many piglit assertion failures in radeon_unmap_renderbuffer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92184

            Bug ID: 92184
           Summary: Many piglit assertion failures in
                    radeon_unmap_renderbuffer
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R100
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: idr at freedesktop.org
        QA Contact: dri-devel at lists.freedesktop.org

While doing other things, I noticed quite a few piglit tests crashing with

    radeon_fbo.c:454: radeon_unmap_renderbuffer: Assertion `ok' failed.

This occurs when r100_blit fails.  Just skimming the code, there are a LOT of
reasons that r100_blit could return false, so it seems like there should be
some fallback path.  Some (perhaps all?) of the failures also log

    WRITE DOMAIN RELOC FAILURE 0x1 6 4

Some tests that fail in this manner are:

    bin/fbo-depthstencil copypixels default_fb -auto
    bin/stencil-drawpixels -auto
    bin/texsubimage -auto
    bin/tex3d-depth1 -auto -fbo

There are many others.  On my last run there were 39 crashes (out of 1072 tests
not skipped), and most of those seem to be this assertion.

If it matters, this was on:

Linux grundgetta.home 4.1.6-201.fc22.x86_64 #1 SMP Fri Sep 4 17:49:24 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

00:01.0 PCI bridge [0604]: Intel Corporation 82865G/PE/P AGP Bridge [8086:2571]
(rev 02)
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] RV200 [Radeon 7500/7500 LE] [1002:5157]

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