TK1 System Freeze

[Marcel Ziswiler <marcel.ziswiler-2KBjVHiyJgBBDgjK7y7TUQ@public.gmane.org>]

Hi there

I lately was tasked to run some legacy Qt4e [1] application on Apalis
TK1. It should really only draw directly to the Linux frame buffer
/dev/fb0. Strangely as soon as that application is started the whole
system freezes. Running it with the VNC backend or a pure frame buffer
emulation it works just fine. So it must have something to do with the
particular way the frame buffer is done on TK1. So far no attempt in
debugging this any further bear any fruit. Whether stracing what the
application is doing nor tracing the linux kernel side of things
revealed where exactly the freeze happens. As I feared some kind of a
configuration issue on Apalis TK1 I also tried the same on Jetson TK1
with latest stock Linux kernel 4.14. However the same freeze happens.

Has anybody ever seen a similar complete system freeze? Any ideas what
it may be or how we could debug this any further?

[1] https://layers.openembedded.org/layerindex/recipe/43622/

Cheers

Marcel