mesa: 314ccf69016d0025ce251155553cc448159a3b10 (master)

$ ./bin/glean -t pbo --quick
FAILURE: glDrawPixels failed (at tpbo.cpp:317)
  got (0, 1) = [0, 0, 0], should be [1, 1, 1]
Mesa: User error: GL_INVALID_OPERATION in glDrawPixels(invalid PBO access)
Mesa: User error: GL_INVALID_OPERATION in glReadPixels(out of bounds PBO access)
pbo:  FAIL rgba8, db, z24, s8, win+pmap, id 33
	7 tests passed, 1 tests failed.


a43b49dfb13dc7e6d2d6d7ceee892077038d7102 is the first bad commit
commit a43b49dfb13dc7e6d2d6d7ceee892077038d7102
Author: Dave Airlie <airlied@redhat.com>
Date:   Wed Nov 13 12:53:52 2013 +1000

    mesa/swrast: fix inverted front buffer rendering with old-school swrast
    
    I've no idea when this broke, but we have some people who wanted it fixed,
    so here's my attempt.
    
    reproducer, run readpix with swrast hit f, or run trival tri -sb things are
    upside down, after this patch they aren't.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=62142
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66213
    
    Cc: <mesa-stable@lists.freedesktop.org>"
    Signed-off-by: Dave Airlie <airlied@redhat.com>

:040000 040000 70e437e84fa67556a6469a8bf75277a6ec07e8a6 a307a4bc1dcb80aae42897ce27b7771dd8760f4f M	src
bisect run success