softethervpn5-client: general protection fault

Maintainer: @Andy2244
Environment: VirtualBox x86_64, OpenWrt 21.02.0 r16279-5cc0535800

Description:
After successfully configuring softethervpn5-client using vpncmd, I try to connect it using AccountConnect <name>, and let OpenWrt to get IP using DHCP, I achieve network connectivity (ping -I vpn_wand 8.8.8.8 works), but after a minute the general protection fault appears in logread and connectivity is lost suddenly.
All installed packages are up-to-date.
I followed most of the steps mentioned here: SoftEther VPN Client

vpncmd commands ( are filled parameters):

NicCreate wand
AccountCreate test /SERVER:<hostname:port> /HUB:<hubname> /USERNAME:<username> /NICNAME:wand
AccountAnonymousSet test
AccountConnect test

Snippet of /etc/config/dhcp:

config dhcp 'wand'
        option interface 'wand'
        option ignore '1'
        list ra_flags 'none'

Snippet of /etc/config/network:

config interface 'wand'
        option proto 'dhcp'
        option device 'vpn_wand'
        option hostname '*'
        option metric '30'

Snippet of /etc/config/firewall:

config zone
        option name 'wan'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
        list network 'wan'
        list network 'wan6'
        list network 'wand'

Packages:

root@OpenWrt:~# opkg list-installed | grep soft
luci-app-softether - git-21.011.72214-ec5ce98
softethervpn5-client - 5.02.5180-1
softethervpn5-libs - 5.02.5180-1

Logs:

Wed Oct 26 19:03:13 2022 daemon.notice netifd: Interface 'wand' is now up
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: reading /tmp/resolv.conf.d/resolv.conf.auto
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain test
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain onion
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain localhost
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain local
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain invalid
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain bind
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using only locally-known addresses for domain lan
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using nameserver 8.8.8.8#53
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using nameserver 10.211.254.254#53
Wed Oct 26 19:03:13 2022 daemon.info dnsmasq[7790]: using nameserver 8.8.8.8#53
Wed Oct 26 19:03:13 2022 user.notice firewall: Reloading firewall due to ifup of wand (vpn_wand)
Wed Oct 26 19:04:13 2022 kern.info kernel: [  125.445977] traps: vpnclient[7966] general protection fault ip:7f6903967c0c sp:7f6903093700 error:0 in libc.so[7f6903965000+49000]

Reproduce the crash with softethervpn5-client on OpenWrt 21.02 using the vpncmd sequence and the wand network configuration shown. Start with the kernel log entry for vpnclient and investigate the client failure after connectivity is established. Done means identifying the cause of the general protection fault and preventing the connectivity loss.