Hi Oliver,
git pull, bug is fixed for uClibc-ng based system. uClibc-ng fakes to be GNU C Library in a special old version. Some code in brutefir uses then functions, which triggers the segfault. Unfortunately we cannot change the fake numbers, as it triggers some problems in the toolchain. We tried this a few years ago. So I just disable the usage of the old function usage in brutefir when uClibc-ng is in use.
best regards Waldemar