Created attachment 1844339 [details]
radiusd logs

Description of problem:/status
the process "radiusd" crashed (SEGV) when it was trying to send "Status-server" message to the home_server wchich was unavailable and marked as "dead" on the proxy_server.

Version-Release number of selected component (if applicable):
RHEL-8.6.0-20211129.1
freeradius-3.0.20-11.module+el8.6.0+13327+85cf8b97

How reproducible:

Steps to Reproduce:
It is necessary to have two machines (proxy and home FR server)

Proxy server:
1. install FreeRADIUS (+FR-utils) and generate default certs.
2. add home_server into proxy.conf

realm redhat.com {
    pool = pool_redhat.com
    nostrip
}

realm local.org {
    nostrip
}

home_server redhat.com {
    type = auth+acct
    ipaddr = IP_home_server
    port = 1812
    secret = testing123
    response_window = 20
    zombie_period = 40
    status_check = status-server
    check_interval = 30
    check_timeout = 4
    num_answers_to_alive = 3
    max_outstanding = 65536

}

realm NULL {
}

3. add a user into /etc/raddb/users:
...
localuser  Cleartext-Password := "hello"
...

4. enable "rlm_detail" module (/etc/raddb/mods-enabled/detail) and uncomment filename = ${radacctdir}/detail (comment other filename above)

5. enable "/etc/raddb/sites-enabled/copy-acct-to-home-server" and add there:
        preacct {
                preprocess
                update control {
                        Proxy-To-Realm := "redhat.com"
                }
        }
6. systemctl start radiusd

home_server
1. add an user into user file
...
remoteuser  Cleartext-Password := "hello"
...
2. add a proxy server to the clients.conf  

local.org {
     ipaddr = IP_proxy_server
     secret = testing123
}
3. systemctl start radiusd
-----------------------
1. check that home_server can reply to acct_req
run on proxy_server:
echo 'User-Name=remoteuser,Acct-Session-Id=60000082,Acct-Status-Type=Start,NAS-IP-Address=192.168.111.104,NAS-Port=0'| radclient -x localhost:1813 acct testing123
(acct_request should be recorded in detail file -> /var/log/radius/radacct/ on home_server)

2. run on proxy_server and check if the "acct-req" is recorded on home_server
echo 'User-Name=localuser,Acct-Session-Id=60000082,Acct-Status-Type=Start,NAS-IP-Address=192.168.111.104,NAS-Port=0'| radclient -x localhost:1813 acct testing123

3. stop radiusd on home_server and run command 1 again on the proxy_server again

Actual results:
The proxy_server tried to forward an "acct_req" for "localuser" to the home_server. This was not possible because the home_server was not available and therefore the home_server was marked as zombie and after a zombie_period with a status "dead". The proxy_server crashed (coredump was attached) after the first "Server-status" message had been sent after the state "dead" (/var/log/radius/radius.log)

Expected results:
It should work and the FR should not crash.