The result of 'git bisect':

e027935a795ecf546f3e4abcc25655766f9615ac is the first bad commit
commit e027935a795ecf546f3e4abcc25655766f9615ac
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Wed Feb 22 19:59:27 2017 +0100

    st/mesa: don't update unrelated states in non-draw calls such as Clear

    If a VAO isn't bound and u_vbuf isn't enabled because of the Core profile,
    we'll get user vertex buffers in drivers if we update vertex buffers
    in glClear. So don't do that.

    This fixes a regression since disabling u_vbuf for Core profiles.

    Reviewed-by: Brian Paul <brianp@vmware.com>

:040000 040000 7843bc274cb97b72ebd0ba00906ba3baeecf0658
97a362bcd14da53ec9cfa940b3612d77e54be72d M      src