synaptics driver causes X11 to crash repeatedly

Binary package hint: xserver-xorg-input-synaptics

I just upgraded my natty system:

x11-common (1:7.6~3ubuntu11) to 1:7.6+4ubuntu1
xorg (1:7.6~3ubuntu11) to 1:7.6+4ubuntu1
xserver-common (2:1.10.0-0ubuntu2) to 2:1.10.0-0ubuntu3
xserver-xorg (1:7.6~3ubuntu11) to 1:7.6+4ubuntu1
xserver-xorg-core (2:1.10.0-0ubuntu2) to 2:1.10.0-0ubuntu3
xserver-xorg-dev (2:1.10.0-0ubuntu2) to 2:1.10.0-0ubuntu3
xserver-xorg-input-all (1:7.6~3ubuntu11) to 1:7.6+4ubuntu1
xserver-xorg-input-synaptics (1.3.99+git20110116.0e27ce3a-0ubuntu8) to 1.3.99+git20110116.0e27ce3a-0ubuntu9
xserver-xorg-video-all (1:7.6~3ubuntu11) to 1:7.6+4ubuntu1
xserver-xorg-video-intel (2:2.14.0-4ubuntu4) to 2:2.14.0-4ubuntu5

Installed the following packages:
xserver-xorg-video-qxl (0.0.12-1ubuntu4)

Now, X11 crashes every time I touch/use my synaptics touchpad. Backtrace:

[ 487.512] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eaa9b]
[ 487.512] 1: /usr/bin/X (0x8048000+0x5faa8) [0x80a7aa8]
[ 487.512] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x59a40c]
[ 487.512] 3: /usr/lib/xorg/modules/input/synaptics_drv.so (0x209000+0xa482) [0x213482]
[ 487.512] 4: /usr/lib/xorg/modules/input/synaptics_drv.so (0x209000+0xa702) [0x213702]
[ 487.512] 5: /usr/lib/xorg/modules/input/synaptics_drv.so (0x209000+0xabb9) [0x213bb9]
[ 487.512] 6: /usr/lib/xorg/modules/input/synaptics_drv.so (0x209000+0x6722) [0x20f722]
[ 487.512] 7: /usr/bin/X (0x8048000+0x6b3bf) [0x80b33bf]
[ 487.512] 8: /usr/bin/X (0x8048000+0x12dd16) [0x8175d16]
[ 487.512] 9: (vdso) (__kernel_sigreturn+0x0) [0x59a400]
[ 487.512] 10: /usr/bin/X (0x8048000+0x27ede) [0x806fede]
[ 487.512] 11: /usr/bin/X (0x8048000+0x1a7ec) [0x80627ec]
[ 487.512] 12: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x29ee37]
[ 487.512] 13: /usr/bin/X (0x8048000+0x1a3e1) [0x80623e1]
[ 487.512] Segmentation fault at address (nil)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xserver-xorg-input-synaptics (not installed)
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
NonfreeKernelModules: nvidia wl
Architecture: i386
Date: Fri Apr 1 09:56:38 2011
DistroCodename: natty
DistroVariant: ubuntu
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110302)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xserver-xorg-input-synaptics
UpgradeStatus: Upgraded to natty on 2011-03-28 (3 days ago)
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu1