Comment 25 for bug 289338

confirmed over here...
dubkat@stargazer ~ $ kde4-config --version
Qt: 4.5.3
KDE: 4.3.2 (KDE 4.3.2)
kde4-config: 1.0

i frequently have to keep a terminal window open running htop so that i can kill off any runaway kio_thumbnail processes. failure to do so causes the system to freeze, and the disk to thrash. I have 4 gigs of memory, and about 8 gigs of swap space. All easily eaten up by kio_thumbnail.