Backtrace:
0: /usr/bin/X(xf86SigHandler+0x6a) [0x49186a]
1: /lib/libc.so.6 [0x2ba55c10e100]
2: /usr/lib/libpixman-1.so.0 [0x2ba55b7e2c13]
3: /usr/lib/libpixman-1.so.0 [0x2ba55b7e8932]
4: /usr/lib/libpixman-1.so.0(pixman_composite_rect_general+0x38c) [0x2ba55b7e6b2c]
5: /usr/lib/libpixman-1.so.0 [0x2ba55b7eee63]
6: /usr/lib/libpixman-1.so.0(pixman_image_composite+0x6de) [0x2ba55b7ee21e]
7: /usr/lib64/xorg/modules//libfb.so(fbComposite+0x20d) [0x2ba55e54e3bd]
8: /usr/lib64/xorg/modules/drivers//nvidia_drv.so(_nv000848X+0x413) [0x2ba55df5a0b3]

Fatal server error:
Caught signal 11.  Server aborting