stap server is not able to use

[Lee Eric <openlinuxsource@gmail.com>]

Hi,

I just noticed my stap scripts need to run via stap-server and I
followed the doc link https://sourceware.org/systemtap/wiki/SecureBoot
to set up stap server. However, I feel like the error messages from
the stap command is really odd:

# stap --list-server=all
...
 host=thinkpad01.local address=127.0.0.1 port=44621
sysinfo="6.5.10-300.fc39.x86_64 x86_64" version=5.0
certinfo="00:c1:73:c9:a1"
 host=thinkpad01.local address=127.0.0.1 port=44621
sysinfo="6.5.10-200.fc38.x86_64 x86_64" version=5.0
certinfo="00:c1:73:c9:a1"
 host=thinkpad01.local address=127.0.0.1 port=44621
sysinfo="6.3.8-200.fc38.x86_64 x86_64" version=5.0
certinfo="00:c1:73:c9:a1"
 host=thinkpad01.local address=127.0.0.1 port=44621
sysinfo="6.3.8-100.fc37.x86_64 x86_64" version=5.0
certinfo="00:c1:73:c9:a1"
 host=thinkpad01.local address=127.0.0.1 port=44621
sysinfo="6.3.12-200.fc38.x86_64 x86_64" version=5.0
certinfo="00:c1:73:c9:a1"
 host=thinkpad01.local address=127.0.0.1 port=44621
sysinfo="6.5.9-200.fc38.x86_64 x86_64" version=5.0
certinfo="00:c1:73:c9:a1"
...

And I'm using Fedora 39, so I would like to test if stap can connect
to a server regardless the stap command ONLY accepting
hostname/ip/cert serial which they are all the same.

# stap -vvv --use-server=127.0.0.1:44621 -e 'probe begin { exit() }'
...
Session arch: x86_64 release: 6.5.10-300.fc39.x86_64
Build tree: "/lib/modules/6.5.10-300.fc39.x86_64/build"
Using a compile server.
Running sh -c cd '/tmp/stapvTSXTA/client' && zip -qr
'/tmp/stapvTSXTA/client.zip' *
Spawn waitpid result (0x0): 0
Servers matching 127.0.0.1:44621:
 host=unknown address=127.0.0.1 port=44621 sysinfo="unknown"
version=unknown certinfo="unknown"
All specified servers:
 host=unknown address=127.0.0.1 port=44621 sysinfo="unknown"
version=unknown certinfo="unknown"
Unable to connect to a server.
Passes: via server ? using 264956virt/19200res/16128shr/2424data kb,
in 0usr/0sys/4real ms.
Passes: via server failed.  Try again with another '-v' option.
The kernel on your system requires modules to be signed for loading.
The module created by compiling your script must be signed by a
systemtap compile-server.  [man stap-server]
...

What's the meaning of that error exactly? Why stap cannot match one
server in this case? I also did wireshark and I'm sure stap didn't
talk to the tcp port 44621

Is there any clue about this usage? Any help would be appreciated.

Thanks.

Eric