Segfault on Alpine (multithreading)

[ovacikar]

On Alpine Linux running with default setting causes a segfault.
Disabling threading (-s) works

Linux  6.12.13-0-rpi #1-Alpine Thu Feb 13 22:14:30 UTC 2025 armv6l Linux

./tunnel -l udp:0.0.0.0:1234 -r udp:127.0.0.1:5678 -o
Obfuscating packets with simple obfuscator and built-in key.
Started UDP server at 0.0.0.0:1234
Started UDP client for 127.0.0.1:5678
Segmentation fault
./tunnel -l udp:0.0.0.0:1234 -r udp:127.0.0.1:5678 -o -s
Obfuscating packets with simple obfuscator and built-in key.
Started UDP server at 0.0.0.0:1234
Started UDP client for 127.0.0.1:5678