Misc. bug: rpc-server crash without cache

[hbuxiaofei]

Name and Version

# ./llama-cli --version
version: 5218 (00e3e5a1)
built with cc (Debian 12.2.0-14) 12.2.0 for x86_64-linux-gnu

Operating systems

Linux

Which llama.cpp modules do you know to be affected?

No response

Command line

Problem description & steps to reproduce

If rpc-server is started as a background process and no cache is specified, it fails.

root@debian12-dev:~# systemctl status lxllamad.service 
● lxllamad.service - Lxllamad service for distributed inference
     Loaded: loaded (/lib/systemd/system/lxllamad.service; enabled; preset: enabled)
     Active: active (running) since Tue 2025-04-29 10:00:22 EDT; 2s ago
   Main PID: 54469 (lxllamad)
      Tasks: 4 (limit: 9442)
     Memory: 3.0M
        CPU: 14ms
     CGroup: /system.slice/lxllamad.service
             └─54469 /opt/lxllama/lxllamad

Apr 29 10:00:22 debian12-dev systemd[1]: Started lxllamad.service - Lxllamad service for distributed inference.
Apr 29 10:00:22 debian12-dev lxllamad[54491]: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Apr 29 10:00:22 debian12-dev lxllamad[54491]: WARNING: Host ('0.0.0.0') is != '127.0.0.1'
Apr 29 10:00:22 debian12-dev lxllamad[54491]:          Never expose the RPC server to an open network!
Apr 29 10:00:22 debian12-dev lxllamad[54491]:          This is an experimental feature and is not secure!
Apr 29 10:00:22 debian12-dev lxllamad[54491]: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Apr 29 10:00:22 debian12-dev lxllamad[54491]: create_backend: using CPU backend
root@debian12-dev:~# ps -efl | grep rpc-server
0 Z root       54491   54469  0  80   0 -     0 -      10:00 ?        00:00:00 [rpc-server] <defunct>
0 S root       54495    1036  0  80   0 -  1584 pipe_r 10:00 pts/1    00:00:00 grep --color=auto rpc-server

rpc-server is started like this: /opt/llama/bin/rpc-server -t 8

First Bad Commit

No response

Relevant log output

[CISC]

Was this fixed in #13188?