Starman "Server closed connection without sending any data back"

nikosv has asked for the wisdom of the Perl Monks concerning the following question:

I have setup a plack psgi application tha works with cgi files. When I start starman server from the shell of the user 'starman' the service runs fine and responds to requests.
When I try to set it up as a systemd Unit (Centos) , the client gets an error of "Server closed connection without sending any data back" without emitting any data.OS is Centos7. Can't find anything in the log files,expect from dmseg which has error :

111362894.832068 starman master 24776: segfault at c1 ip 00007f29bd8d2057 sp
 00007fff6ba44168 error 4 in XS.so7f29bd8cf000+15000

The service is set up as :

[Unit]
Description=StarmanService

[Service]
Type=simple
User=starman
Group=starman
ExecStart=/home/starman/perl5/bin/starman -E debug --ssl-key=/home/sta
+rman/starm
anpem+5-key.pem --ssl-cert=/home/starman/starmanpem+5.pem --listen :50
+00:ssl --w
orkers=1 /home/starman/app.psgi --access-log /home/starman/access.log 
+--user=sta
rman --error-log /home/starman/error1.log
Restart=always
WorkingDirectory=/home/starman/cgi-bin

[Install]
WantedBy=multi-user.target
[download]

Comment on Starman "Server closed connection without sending any data back" Download Code

Replies are listed 'Best First'.
Re: Starman "Server closed connection without sending any data back" by hippo (Archbishop) on Nov 28, 2023 at 10:45 UTC
Have you checked the audit log? You can get away with a lot of stuff in an interactive session that will be prohibited by SELinux when started from a systemd service. Systemd then hides that real reason from you in a double-whammy. Worth ruling out at the very least. 🦛	[reply]
Re^2: Starman "Server closed connection without sending any data back" by nikosv (Deacon) on Nov 28, 2023 at 17:10 UTC
nothing in the log unfortunately	[reply]
Re: Starman "Server closed connection without sending any data back" by Corion (Patriarch) on Nov 28, 2023 at 10:25 UTC
My random guess is that the interactive shell for `starman` has the environment variable PERL5LIB set up to something and the systemd version lacks such an environment variable, and loads a wrong version of the SSL XS modules. Or maybe it is some other difference between the `starman` user when run interactively and when run via `systemd`... Update: But see hippo's reply - SELinux sounds like a more propable culprit to rule out first.	[reply] [d/l] [select]
Re^2: Starman "Server closed connection without sending any data back" by nikosv (Deacon) on Nov 28, 2023 at 16:19 UTC
I did set the PERL5LIB inside the service to any paths I could find by perl -V but unfortunately it didn't make any difference.	[reply]