core dumped error when running ./level-ip curl www.xxx.com

[jackkkkklee]

issue

when I run

./level-ip curl www.xxx.com

the output is

./level-ip: line 8: 95338 Segmentation fault      (core dumped) LD_PRELOAD="$(dirname $0)/liblevelip.so" "$prog" "$@"

Describe your running environment

running in centos 7

[jackkkkklee]

Is it caused by wrong setting of iptables?
I use commands from guide and also replace the output interface name ,but it seems not working.
My iptables show as below.

Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- 10.0.0.0/24 anywhere

Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

[qlibp]

same