Segmentation fault on arm64

[islue]

Segmentation fault happens if I use 127.0.0.1 as node on arm64.
Instead, the local ip address works fine.
127.0.0.1 works fine on x86_64.

Here is my env, a t4g.micro ec2 instance with amzn2.

$ uname -a
Linux ip-10-1-100-13.ap-northeast-1.compute.internal 4.14.275-207.503.amzn2.aarch64 #1 SMP Wed Apr 13 20:24:49 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

$ cat /etc/proxy.conf 
port 8125
num_threads 2
flush_interval 100 # ms
socket_send_packet_size 8192

node 127.0.0.1:8126:1
#node 10.1.100.13:8126:1

$ statsd-proxy -v
statsd-proxy@0.1.0

gdb said it happens here.

$ sudo gdb /usr/bin/statsd-proxy core.3431
...Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000406178 in start (config=0xb40000ffff8f65ed, config@entry=0x2cd3e260) at src/statsd-proxy.c:108
108	        if ((ctxs[i] = ctx_new(config->nodes, config->num_nodes, config->port,

I'm not good at c program, so the best I can do is to add log_debug around and see the output.
Well, it doesn't help.
Any idea?