[lich.rbw] Unclean exit of client when using detachable client can lead to 'zombie' lich

[vtcifer]

When using detachable client, sometimes when there is an unclean tcp session break between the client and lich, lich will not re-open the port for the client to connect. When that happens the only way to regain control is to kill/restart that lich instance.

From the debug log when that occurs:

2024-06-12 07:55:47: error: client_thread: Broken pipe
        /home/lich/lich/lich.rbw:193:in `write'
        /home/lich/lich/lich.rbw:193:in `block in write'
        /home/lich/lich/lich.rbw:192:in `synchronize'
        /home/lich/lich/lich.rbw:192:in `write'
        /home/lich/lich/lich.rbw:1095:in `block in open'

netstat from that same time, not listening or established connections on tcp/8000:

root@11dbd222b9a0:/home/lich/lich# netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 127.0.0.11:44599        0.0.0.0:*               LISTEN
tcp        0      0 172.18.0.8:42990        162.159.133.234:443     ESTABLISHED
tcp        0      0 10.0.12.128:54688       10.0.12.5:5000          ESTABLISHED
tcp        0      0 172.18.0.8:41362        45.33.118.192:7155      ESTABLISHED
tcp        0      0 172.18.0.8:49766        199.188.208.5:11024     ESTABLISHED
udp        0      0 127.0.0.11:58716        0.0.0.0:*
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   Path