'RE: [Ntop-dev] ntop seg. fault'

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List:       ntop-dev
Subject:    RE: [Ntop-dev] ntop seg. fault
From:       "Burton M. Strauss III" <BStrauss3 () attbi ! com>
Date:       2002-02-15 18:07:27
Message-ID: HBEBKGPKAEJLGMLAANAOOEHFDKAA.BStrauss3 () attbi ! com
[Download RAW message or body]

I know there was a seg fault problem - I've posted my trap on it previously,
but I don't know if the latest version has fixed it - I'm stuck back a
couple of days working on a change.

Best bet is to run it under gdb and capture the relevant information about
the failure...

One other thing - the 3c509b MAY cause you some problems.  It's an old ISA
card, and I've had issues with them under promiscuous mode (this was with
snort, before I started playing with ntop, but still... it's all libpcap!).
Just keep it in mind if you see odd results.  You don't have to pay the $
for a 3c905 (although I do love them) - I'm also using $20 NetGear FA310s
and 311s and Linksys LNX100 (or whatever it's called) just fine...

-----Burton

-----Original Message-----
From: ntop-dev-admin@unipi.it [mailto:ntop-dev-admin@unipi.it]On Behalf
Of PIERRE-LOIC BAUDET
Sent: Friday, February 15, 2002 10:15 AM
To: ntop-dev@unipi.it
Subject: RE: [Ntop-dev] ntop seg. fault

Hello everyone,

Well, I have a problem... I installed ntop (February,
12nd release) and it seemed to work properly. I had no
trouble with make and make install phases (except a
warning about SSL missing, which doesn't matter).
Unfortunately, it crashes after a 3 hours and a half run
(segmentation fault). I am sorry to disturb you with this
common problem....

Here is the log :

(...)
15/Feb/2002 12:22:17 Welcome to nfsWatchPlugin. (C) 1999
by Luca Deri.
15/Feb/2002 12:22:17 Welcome to sflowPlugin. (C) 2002 by
Luca Deri.
15/Feb/2002 12:22:17 WARNING: For security reasons it is
STRONGLY recommended to15/Feb/2002 12:22:17 WARNING: run
ntop as unprivileged user by using the -u option!
15/Feb/2002 12:22:17 Resetting traffic statistics...
15/Feb/2002 12:22:17 Started thread (1026) for network
packet analyser.
15/Feb/2002 12:22:17 Started thread (2051) for host
traffic statistics.
15/Feb/2002 12:22:17 Started thread (3076) for throughput
update.
15/Feb/2002 12:22:17 Started thread (4101) for idle hosts
detection.
15/Feb/2002 12:22:17 Started thread (5126) for DNS
address resolution.
15/Feb/2002 12:22:17 Started thread (6151) for address
purge.
15/Feb/2002 12:22:17 Initializing plugins (if any)...
15/Feb/2002 12:22:17 Welcome to sFlow: listening on UDP
port 6343...
15/Feb/2002 12:22:17 Waiting for HTTP connections on port
8080...
15/Feb/2002 12:22:17 Sniffying...
15/Feb/2002 12:22:17 Started thread (9226) for network
packet sniffing on eth0.
15/Feb/2002 12:22:17 Started thread (10251) for network
packet sniffing on eth1.
15/Feb/2002 12:22:17 Started thread (11276) for network
packet sniffing on eth2.
15/Feb/2002 12:23:11 Extending hash size [newSize=64]
15/Feb/2002 12:25:58 Extending hash size [newSize=128]
Erreur de segmentation          (i.e "seg-fault" !)

I wonder if the seg-fault happens just before the next
hashtable extension ? This is just a supposition...

Actually, I'd like to do the same as G. Serafini (Cf.
http://listmanager.unipi.it/pipermail/ntop/2002-
February/001094.html) in the near future...

ntop runned like this : ntop -i eth0,eth1,eth2 -w 8080 -
P /tmp'

eth0 and eth1 were not connected to the network.

---------

Hard : old IBM Pentium II-300 MHz 160 Mo RAM
       1x 3COM 509B (eth0) RJ-45 socket
       2x 3COM 905C-TX  (eth1 & eth2) RJ-45 socket

OS : Linux-Mandrake 8.1 - Kernel 2.4.8-26mdk
ntop version : 2002/02/12. (compiled from the source). No
extra plugin added

Misc. :

glibc v. 2.2.4
gcc v. 2.96

wu-ftp, telnet, mysql, postgres running

monitoring a LAN, 100 machines approx. Light traffic.

Thanks !

Pierre-Loic

PS : Raul Alonso Alvarez, thanks a lot for your useful
answer !
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