RE: Unresponsive Child Crashing Server 1.1.6

28 Sep 2007


      I have not seen any answers and strangly enough I did not even find in
the archive so I thought I would resend it.  Thanks.

---
Walt Reynolds
Principal Systems Security Development Engineer
Information Technology Central Services
University of Michigan
(734) 615-9438
...
-----Original Message-----
From: Reynolds, Walter
Sent: Friday, September 21, 2007 10:37 AM
To: 'freeradius-users@lists.freeradius.org'
Subject: Unresponsive Child Crashing Server 1.1.6
I am having a problem where my Freeradius service is crashing several
times a day.  It will follow an alert in the log with Unresponsive
Child which I know is usually doe to a slow back end authentication
method (usually SQL).  Well I am using Kerberos as the back end and
every time I debug the Kerberos server responds very quickly.  I have
no programming or database queries to slow things down.  Even stranger
is that this is a beta server and the load on it is really very light.
Last three days however have lots of problems:
Tue Sep 18 00:37:03 2007 : Error: WARNING: Unresponsive child (id
1210108256) for request 487
Tue Sep 18 07:27:18 2007 : Error: WARNING: Unresponsive child (id
1210108256) for request 672
Tue Sep 18 10:46:27 2007 : Error: WARNING: Unresponsive child (id
1189128544) for request 173
Tue Sep 18 12:07:55 2007 : Error: WARNING: Unresponsive child (id
1231087968) for request 127
Tue Sep 18 12:55:55 2007 : Error: WARNING: Unresponsive child (id
1210108256) for request 72
Tue Sep 18 14:59:33 2007 : Error: WARNING: Unresponsive child (id
1220598112) for request 86
Tue Sep 18 15:53:20 2007 : Error: WARNING: Unresponsive child (id
1220598112) for request 102
Tue Sep 18 17:04:41 2007 : Error: WARNING: Unresponsive child (id
1220598112) for request 104
Tue Sep 18 21:06:26 2007 : Error: WARNING: Unresponsive child (id
1189128544) for request 305
Wed Sep 19 07:51:26 2007 : Error: WARNING: Unresponsive child (id
1231087968) for request 502
Wed Sep 19 12:26:59 2007 : Error: WARNING: Unresponsive child (id
1231087968) for request 80
Wed Sep 19 14:24:48 2007 : Error: WARNING: Unresponsive child (id
1101056352) for request 76
Wed Sep 19 16:31:49 2007 : Error: WARNING: Unresponsive child (id
1356966240) for request 282
Thu Sep 20 12:47:59 2007 : Error: WARNING: Unresponsive child (id
1252067680) for request 368
Thu Sep 20 16:35:10 2007 : Error: WARNING: Unresponsive child (id
1252067680) for request 336
Thu Sep 20 20:55:50 2007 : Error: WARNING: Unresponsive child (id
1084229984) for request 256
Fri Sep 21 01:37:58 2007 : Error: WARNING: Unresponsive child (id
1325496672) for request 503
Fri Sep 21 10:13:03 2007 : Error: WARNING: Unresponsive child (id
1398925664) for request 766
Running in debug has not really shown anything as it has not shown
that
error or crashed, so I am unsure of how to proceed.
Attached is my radiusd.conf:
=========================
prefix = /usr/local
exec_prefix = ${prefix}
sysconfdir = ${prefix}/etc
localstatedir = ${prefix}/var
sbindir = ${exec_prefix}/sbin
logdir = ${localstatedir}/log/radius
raddbdir = ${sysconfdir}/raddb
radacctdir = ${logdir}/radacct
confdir = ${raddbdir}
run_dir = ${localstatedir}/run/radiusd
log_file = ${logdir}/radius.log
libdir = ${exec_prefix}/lib
pidfile = ${run_dir}/radiusd.pid
user = radius   ## Determined by sytem administrator
group = radius  ## Determined by sytem administrator
max_request_time = 3 #changed from default of 30
delete_blocked_requests = no
cleanup_delay = 3
max_requests = 750000 # recommends 256 per client
listen {
        ipaddr = *
        port = 1812
        type = auth
}
listen {
        ipaddr = *
        port = 1813
        type = acct
}
listen {
        ipaddr = *
        port = 1645
        type = auth
}
listen {
        ipaddr = *
        port = 1646
        type = acct
}
hostname_lookups = no
allow_core_dumps = no
regular_expressions     = yes
extended_expressions    = yes
log_stripped_names = no
log_auth = yes
log_auth_badpass = no
log_auth_goodpass = no
usercollide = no
lower_user = no
lower_pass = no
nospace_user = no
nospace_pass = no
checkrad = ${sbindir}/checkrad
security {
        max_attributes = 50 #Default of 200 to high
        reject_delay = 0
        status_server = no
}
proxy_requests  = yes
$INCLUDE  ${confdir}/proxy.conf
$INCLUDE  ${confdir}/clients.conf
snmp    = no
$INCLUDE  ${confdir}/snmp.conf
thread pool {
        start_servers = 32
        max_servers = 64
        min_spare_servers = 8
        max_spare_servers = 32
        max_requests_per_server = 500
}
modules {
        krb5 {
                  keytab = /etc/keytab.radius.wallace
                  service_principal = host
        }
        pap {
                auto_header = yes
        }
$INCLUDE ${confdir}/eap.conf
        realm suffix {
                format = suffix
                delimiter = "@"
                ignore_default = no
                ignore_null = no
        }
        preprocess {
                huntgroups = ${confdir}/huntgroups
                hints = ${confdir}/hints
                with_ascend_hack = no
                ascend_channels_per_line = 23
                with_ntdomain_hack = no
                with_specialix_jetstream_hack = no
                with_cisco_vsa_hack = no
        }
        files {
                usersfile = ${confdir}/users
                acctusersfile = ${confdir}/acct_users
                preproxy_usersfile = ${confdir}/preproxy_users
                compat = no
        }
        detail {
                detailfile = ${radacctdir}/detail-%Y%m%d
                detailperm = 0600
                suppress {
                        User-Password
                }
        }
acct_unique {
                key = "User-Name, Acct-Session-Id, NAS-IP-Address,
Client-IP-Address, NAS-Port"
        }
        radutmp {
                filename = ${logdir}/radutmp
                username = %{User-Name}
                case_sensitive = yes
                check_with_nas = no
                perm = 0600
                callerid = "yes"
        }
        attr_filter {
                attrsfile = ${confdir}/attrs
        }
        counter daily {
                filename = ${raddbdir}/db.daily
                key = User-Name
                count-attribute = Acct-Session-Time
                reset = daily
                counter-name = Daily-Session-Time
                check-name = Max-Daily-Session
                allowed-servicetype = Framed-User
                cache-size = 5000
        }
        always fail {
                rcode = fail
        }
        always reject {
                rcode = reject
        }
        always ok {
                rcode = ok
                simulcount = 0
                mpp = no
        }
        expr {
        }
        digest {
        }
        exec {
                wait = yes
                input_pairs = request
        }
}
instantiate {
        exec
        expr
}
authorize {
        preprocess
        suffix
        eap
        files
        pap
}
authenticate {
        Auth-Type Kerberos {
                krb5
        }
        Auth-Type PAP {
                pap
        }
        eap
}
preacct {
        preprocess
        acct_unique
        suffix
        files
}
accounting {
        detail
}
session {
}
post-auth {
}
pre-proxy {
}
post-proxy {
        eap
}
=======================
Users file:
DEFAULT      FreeRADIUS-Proxied-To == 127.0.0.1
             User-Name = `%{User-Name}`,
                Fall-Through = yes
DEFAULT         Auth-Type = Kerberos
                Fall-Through = 1
Can anyone give me any help on what to look at or change.  Thanks.
---
Walt Reynolds
Principal Systems Security Development Engineer
Information Technology Central Services
University of Michigan
(734) 615-9438