shibd Aborted, No Error in Logs

[Kannan, Satheesh (ELS-CON)]

Thanks for explaining.

I haven't seen this issue in earlier versions.

It could worth limiting MaxRequestWorkers on apache level to fix this issue. Any temporary workaround to fix this issue.

Any idea about limits number of tcp connection per ec2 instance?

In your Apache MPM configuration (e.g., in `/etc/httpd/conf.modules.d/00-mpm.conf` or your main config): `

``apache <IfModule mpm_prefork_module>
     MaxRequestWorkers 256 </IfModule>

<IfModule mpm_worker_module> MaxRequestWorkers 300 </IfModule>

<IfModule mpm_event_module> MaxRequestWorkers 300 </IfModule> ```

Regards,
Satheesh


________________________________
From: users <users-bounces at shibboleth.net> on behalf of Cantor, Scott via users <users at shibboleth.net>
Sent: Wednesday, July 16, 2025 11:01 PM
To: Shib Users <users at shibboleth.net>
Cc: Cantor, Scott <cantor.2 at osu.edu>
Subject: Re: shibd Aborted, No Error in Logs

*** External email: use caution ***



> You should have the thread count there from the core, and that
> would indicate roughly how many sockets were open, though not
> one to one.

Concretely, I've seen maybe on the order of 20-30 sockets open on a heavily loaded worker mode Apache, as it basically matches the Apache child count "mostly", and probably double the child count is as much as I'd expect.

If it's more than that, somethiing's hanging it up getting work done and maybe causing more sockets than it should be, but the daemon generally doesn't do a lot of work that causes delays unless memcache or ODBC were used (*).

-- Scott

(*) Metadata aside, but that's more about memory than a cause of performance lag after startup, and MDQ obviates that anyway.


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