https://bugs.freedesktop.org/show_bug.cgi?id=82814

--- Comment #1 from Ilia Mirkin <imir...@alum.mit.edu> ---
FWIW I'm fairly sure that it's actually commit
39b40ad144f5f587e505b45048e33a03641ba857
Author: Brian Paul <bri...@vmware.com>
Date:   Fri Aug 8 15:01:50 2014 -0600

    mesa: fix assertion in _mesa_drawbuffers()

    Fixes failed assertion when _mesa_update_draw_buffers() was called
    with GL_DRAW_BUFFER == GL_FRONT_AND_BACK.  The piglit gl30basic hit
    this.

    Cc: "10.2" <mesa-sta...@lists.freedesktop.org>

    Reviewed-by: Ian Romanick <ian.d.roman...@intel.com>

It changed a if (n == 1) into a if (_mesa_bitcount(...) > 1) without any regard
for n, which might be 0. Should probably be

if (n > 0 && ...) or if (n == 1 && ...). Not entirely sure what the logic is
there though.

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