FreeRadius 2.1.8 problem

Stylianos Stylianou s.stylianou at
Fri Apr 16 13:59:11 CEST 2010

Hi all,

I have a similar problem on a machine with CentOS 5 Update 4. The 
freeradius packages which I use are taken from jdennis repository 
Packages versions are:

I configured two different freeradius servers on the same machine. 
Compared to the default configuration, the one radius has the addition 
of using sqlippool and the second radius calls an external perl script 
which in turns connects via ssh to another server and then runs some 
other scripts on it.

The first radius with the sqlippool runs for more than 2 months without 
any problem at all.

The second one which calls an external perl script hungs after a few hours.
When I issue the status command the result is
> # /etc/init.d/radiusd status
> radiusd dead but pid file exists

I configured freeradius to call the script with the perl module as well 
as using the exec module with identical results. After the radius stops, 
I see that the perl script log file stops always when it tries to ssh to 
the other server. From the other server statistics it doesn't show 
anything unusual (e.g. high cpu) or any error in the ssh log file.
Of course, the issue is not that there is some problem with the perl 
script, the ssh command or the remote server but that the radius hungs 
when the external script which calls hungs.

Note that this behavior can be reproduced by calling an external script 
like the following
> #!/usr/bin/perl
> use strict;
> my $rc=system("ssh");
> exit($rc); is just an IP address that would cause the ssh to timeout.
Note that the freeradius server does not hang when started in debug mode.

We use exactly the same perl script for the last few years without any 
problem on another machine which runs freeradius version 1.0.1.


On 16/4/2010 1:05 μμ, Alan DeKok wrote:
> Jakob Hirsch wrote:
>> we have freeradius 2.1.8 running on a couple of servers and are very
>> happy with it. But every few days FR crashes on one of the servers (a
>> random one, not always the same). The load is significant (average 150
>> requests/s per server, 400/s peak) but sureley not too high. So
>> everything seems to run fine besides the annoying crashes, which alarms
>> people and make the weekly availibility reports look bad (even though FR
>> is restarted automatically, of course). The previous 1.1.8 installation
>> we upgraded 6 months ago from did not have this problem.
>    Hmm... I've run it at 20K pps for *days*....
>> Anyways, I really want to find out what's going wrong, so I wanted to
>> get core dumps of these crashes. Only that I just don't get them.
>> - radiusd.conf has allow_core_dumps = yes (and FR says "Info: Core dumps
>> are enabled." at startup)
>> - /proc/sys/kernel/core_pattern is set to '/tmp/core.%t.%e.%p', so core
>> dumps can be written to disk (tested with a little programm that forces
>> a segfault)
>> - I put "ulimit -c unlimited" in the startup script.
>> cat /proc/$(pidof freeradius)/limits shows "unlimited" for soft and hard
>> limit of "Max core file size"
>    Often 'root' can't core dump, and programs that change uid can't core
> dump.  It's hard to know what's going on with the OS.
>> So what's missing? The only indication of the crash is this line in syslog:
>>> Apr 10 17:57:19 xxxxxxxx kernel: [12268615.000288] freeradius[14846]: segfault at 73818 ip 00007f0cb40e875e sp 00007fff9c6304c0 error 4 in[7f0cb40d1000+1f000]
>> (This is debian lenny x86_64, btw.)
>> Any hints?
>    doc/bugs.  You'll need symbols to find out what's going on.
>    Alan DeKok.
> -
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