Comment 86 for bug 131094

I can easy reproduce the problem using, when execute the following command on hardy (2.6.24-12.22-generic). All updated. I have not tested it under gutsy.

dd if=/dev/zero of=test1 bs=4k count=250000 & \
dd if=/dev/zero of=test2 bs=4k count=250000 & \
dd if=/dev/zero of=test3 bs=4k count=250000 & \
dd if=/dev/zero of=test4 bs=4k count=250000 & \
dd if=/dev/zero of=test5 bs=4k count=250000 & \
dd if=/dev/zero of=test6 bs=4k count=250000 & \
dd if=/dev/zero of=test7 bs=4k count=250000 & \
dd if=/dev/zero of=test8 bs=4k count=250000 &

The firefox freezes almost every time. Other application (evolution) can be stooped too, but it's not as easy as using firefox.
If I want to switch the desktop by key combination, sometimes it is executes after 10 seconds.
From time to time I can produce an complete freeze of gnome (input events?). All applets (like systemmonitor, cpu-frequency) are working correctly, but I cannot move any windows, using the mouse or keyboard. I have to switch to an console (Ctrl+Alt+F1) and kill all dd processes as root. After killing the dd processes, gnome and all input events work.
The average system load is continuesly climbing. While it reaches a value about 8, the klogd usages 100% of the cpu (I think the daemon crashes).