Created attachment 591226 [details]
Xorg.0.log

Description of problem:
The Xserver stucked on workspace change with Gnome3: the mouse pointer still moving, but screen updates are stopped (conky, etc). I can switch VT, the host is OK.

The Xorg process eats 100% cpu in 'top'.

I'm using the binary nvidia driver from rpmfusion.org.

Version-Release number of selected component (if applicable):
kernel-3.4.0-1.fc17.x86_64
kmod-nvidia-3.4.0-1.fc17.x86_64-295.53-1.fc17.3.x86_64
xorg-x11-drv-nvidia-295.53-1.fc17.x86_64
kmod-nvidia-295.53-1.fc17.3.x86_64
xorg-x11-drv-nvidia-libs-295.53-1.fc17.x86_64
xorg-x11-server-Xorg-1.12.0-5.fc17.x86_64
xorg-x11-server-common-1.12.0-5.fc17.x86_64

How reproducible:
Hardly. I upgraded to F17 a week ago and this is the 2nd lockup.

Additional info:
I've never experienced it on this hardware in F16.

Videocard:
01:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9500 GT] (rev a1)

Xorg GDB backtrace:
#0  0x00000033740eace3 in __select_nocancel () from /lib64/libc.so.6
#1  0x00000000004665eb in CheckConnections ()
#2  0x0000000000462afd in WaitForSomething ()
#3  0x0000000000434061 in ?? ()
#4  0x00000000004233e5 in ?? ()
#5  0x0000003374021735 in __libc_start_main () from /lib64/libc.so.6
#6  0x00000000004236bd in _start ()

# strace -p `pidof xorg`:
16:49:15 select(256, [1 3 23 38], [51 52 61 64 67], NULL, {0, 0}) = -1 EBADF (Bad file descriptor)
16:49:15 select(37, [36], NULL, NULL, {0, 0}) = 1 (in [36], left {0, 0})
16:49:15 select(39, [38], NULL, NULL, {0, 0}) = 1 (in [38], left {0, 0})
16:49:15 select(256, [1 3 23 38], [51 52 61 64 67], NULL, {0, 0}) = -1 EBADF (Bad file descriptor)
16:49:15 select(37, [36], NULL, NULL, {0, 0}) = 1 (in [36], left {0, 0})
16:49:15 select(39, [38], NULL, NULL, {0, 0}) = 1 (in [38], left {0, 0})
16:49:15 select(256, [1 3 23 38], [51 52 61 64 67], NULL, {0, 0}) = -1 EBADF (Bad file descriptor)
16:49:15 select(37, [36], NULL, NULL, {0, 0}) = 1 (in [36], left {0, 0})
16:49:15 select(39, [38], NULL, NULL, {0, 0}) = 1 (in [38], left {0, 0})
16:49:15 select(256, [1 3 23 38], [51 52 61 64 67], NULL, {0, 0}) = -1 EBADF (Bad file descriptor)
[loops over and over; 10000 lines/second]

'lsof' and Xorg.0.log attached.