Hi Tomasz,
[init -> test ->Kernel: Cpu 0 error: re-entered lock. Kernel exception?!
For now the "solution" satisfies me but probably I'll get back to it when I have a JTAG debugger. Without it it is hard to diagnose this.
Stefan is away right now but I think that the following commit is related to this issue. It is part of the just-released Genode 19.02:
https://github.com/genodelabs/genode/commit/2cf4e5a6de176bc0c9fe6da46f06193a...
Cheers Norman