Frustating. Can I ask you to build from scratch with debugging enabled:

# sudo apt-get build-dep xserver-xorg-video-intel
# git clone git://anongit.freedesktop.org/xorg/driver/xf86-video-intel
# cd xf86-video-intel
# ./autogen.sh --prefix=/usr --with-default-accel=sna --enable-debug
# make && sudo make install

That will (temporarily) replace your intel_drv.so with assertions
enabled. It is likely to crash much earlier - hopefully closer to the
actual culprit.

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https://bugs.launchpad.net/bugs/1127497

Title:
  Xorg crashes when exiting steam segfault in sna_pixmap_set_dri()

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