Comment # 1 on bug 1014999 from Oliver Kurz

I had similar symptoms and it turned out that baloo_file_extractor is producing
a lot of IO load during which the system stalled. I worked around the problem
by calling `balooctl disable` and `balooctl stop`.
If not, still calling `iotop` in a terminal might be helpful to see if during
the freeze some big IO is blocking the system.

Otherwise, is it still possible to switch to the text terminal? E.g. try
`ctrl-alt-f1`.