It seems like the bug was already reported in mesa: <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774784> <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775264>
Otherwise, I confirm that I have been running with Mesa 10.3.4 for two weeks on the machine that used to crash occasionally, and not encountered any crash since. In case anyone also needs to install Mesa by hand and does not know how to do so, I have documented the process: <http://a3nm.net/blog/debian_mesa.html>.
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