Unresponsive Child Crashing Server 1.1.6
Reynolds, Walter
waltr at umich.edu
Fri Sep 21 16:36:37 CEST 2007
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
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