Python output causes segfault

[srmppd]

I'm creating my own port and now have the following problem:
When I execute a frozen MPY using pyexec_frozen_module() it runs fine as long as the module does not create any output. But as soon as there is a print() or a raise in the python code I get something like the following output followed by an immediate segfault:

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Traceback (most recent call last):
  File "q", line 1448734720

I looked at the backtrace and the function in which the segfault happens is qstr_data() which is called by mp_obj_print_exception() via mp_vprintf() and mp_printf(). What seems strange to me is that qstr_data() is called with the parameter q=377. I had a look at my qstrdefs.generated.h and it contains 377 elements, so I guess this is where the problem lies but I don't have a clue where to look next to debug this and I hope someone has an idea.

[srmppd]

Adding

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#define MICROPY_QSTR_EXTRA_POOL (mp_qstr_frozen_const_pool)

to my mpconfigport.h seems to have solved my problem.