Backtrace:
0: /usr/bin/Xorg (xorg_backtrace+0x2c) [0x60ef4]
1: /usr/bin/Xorg (0x8000+0x586ac) [0x606ac]
2: /lib/libc.so.6 (__default_rt_sa_restorer_v2+0x0) [0x40338a80]
3: /usr/bin/Xorg (DamageUnregister+0x84) [0xb2570]
4: /usr/lib/xorg/modules/libshadow.so (shadowRemove+0x50) [0x40617508]
5: /usr/lib/xorg/modules/libshadow.so (0x40616000+0x15ec) [0x406175ec]
6: /usr/bin/Xorg (0x8000+0x62724) [0x6a724]
7: /usr/bin/Xorg (0x8000+0x148458) [0x150458]
8: /usr/bin/Xorg (0x8000+0x4db60) [0x55b60]
9: /usr/bin/Xorg (0x8000+0x149e5c) [0x151e5c]
10: /usr/bin/Xorg (0x8000+0xf7538) [0xff538]
11: /usr/bin/Xorg (0x8000+0x678bc) [0x6f8bc]
12: /usr/lib/xorg/modules/drivers/fbdev_drv.so (0x405d7000+0x2974) [0x405d9974]
13: /usr/bin/Xorg (0x8000+0x8ea98) [0x96a98]
14: /usr/bin/Xorg (0x8000+0x101458) [0x109458]
15: /usr/bin/Xorg (0x8000+0x109c18) [0x111c18]
16: /usr/bin/Xorg (0x8000+0x839c4) [0x8b9c4]
17: /usr/bin/Xorg (0x8000+0x9f680) [0xa7680]
18: /usr/bin/Xorg (0x8000+0x7d0f0) [0x850f0]
19: /usr/lib/xorg/modules/extensions/libglx.so (0x40548000+0x321d0) [0x4057a1d0]
20: /usr/bin/Xorg (0x8000+0x1a7e0) [0x227e0]
21: /lib/libc.so.6 (__libc_start_main+0x118) [0x403204dc]
Segmentation fault at address 0x6f66

Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting