It seems the issue is sdl related to change in sdl window size. If I
started qemu and set the monitor (and serial & parallel) to the same VC
size, it works much better. Instead of hangs on a 2-3 switches, it may
hang after rapid switch of more than 10 times. Btw, it can hang in any
windows, i.e. di
Still happened in qemu 2.5.0 on Ubuntu 16.04, it's random but you can
only switch between console, monitor, serial, parallel several times,
then it hangs.
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