Comment 33 for bug 152648

I'm experiencing this bug as well, although it doesn't happen very often. Sometimes when switching desktop X crash. It also happen when using "chvt" from the shell (i.e. when I want to use vnc trough ssh and need to switch user first).

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x6a) [0x48402a]
1: /lib/libc.so.6 [0x7f603e262100]
2: /usr/lib/xorg/modules/drivers//nvidia_drv.so(_nv000759X+0x68) [0x7f603b6d0b78]

Fatal server error:
Caught signal 11. Server aborting

GeForce 6500 rev 161, NVIDIA GLX Module 169.12

I saved the XFree86 log if you want it.