ntop crash "segfault ... error 4 in libntop-3.3.so .."

[Niros Vaudis]

Binary package hint: ntop

ntop crashes after recieving an DHCP-request message.

After issuing an "ipconfig /renew" command on a Windows XP Client, ntop dies immedeately on Ubuntu 10.04 with error log:

"May 31 22:29:13 ubuntu kernel: [360480.454200] ntop[22556]: segfault at 101996caf ip 00007fbd21f59178 sp 00007fbd117b4140 error 4 in libntop-3.3.so[7fbd21f07000+6e000]"

The bug is known with ntop:

http://www.gossamer-threads.com/lists/ntop/users/22488
http://www.ntop.org/trac/changeset/3605

Workaround:
Setting the --disable-decoders flag stopped the crashes.
http://www.gossamer-threads.com/lists/ntop/users/22115

Please update ntop to latest version 3.3.10 or better 3.4pre3

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: ntop 3:3.3-13
ProcVersionSignature: Ubuntu 2.6.32-22.33-server 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-server x86_64
NonfreeKernelModules: vmnet vmci vmmon
Architecture: amd64
Date: Mon May 31 21:17:37 2010
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
SourcePackage: ntop

[Damiön la Bagh (kat-amsterdam)]

Workaround: install the 3.4 version from

apt-add repository ppa:sylvain-garcia

then modify /etc/init.d/ntop
Line 96 add the flag -b *(this is the same as --disable-decoders)

(I started with line 95 to display the full modified command)
 start-stop-daemon --start --quiet --name $NAME --exec $DAEMON -- \
  -d -b -L -u $USER -P $HOMEDIR \

then restart ntop

sudo service ntop restart

it would be nice if the package maintainer would add the -b flag to the package. Or expain to me how to do it and I'll do it myself.

[Ludovico Cavedon (cavedon)]

The latest upstream version (4.0.3) is currently packaged for maverick or in my PPA for older Ubuntu versions:
https://launchpad.net/~cavedon/+archive/ppa

Thanks for taking the time to report the bug.