[SOLVED] Segmentation fault (core dump) in Ubuntu 14.04 ( x86_64)

faysal · 10-11-2014, 03:37 PM

Hi
i have installed ns2.35 in ubuntu14.04,
i hav successfully run tcl script,and it generates out.nam .

#Create a simulator object
set ns [new Simulator]

#Open the nam trace file
set nf [open out.nam w]
$ns namtrace-all $nf

#Define a 'finish' procedure
proc finish {} {
global ns nf
$ns flush-trace
#Close the trace file
close $nf
#Execute nam on the trace file
exec nam out.nam &
exit 0
}

# Insert your own code for topology creation
# and agent definitions, etc. here

#Call the finish procedure after 5 seconds simulation time
$ns at 5.0 "finish"

#Run the simulation
$ns run

bt when i've tried to execute out.nam command, it gave me " Segmentation fault (core dump)" .

this are some few lines that i have added in the .bashrc file:

export PATH=$PATH:/home/faysal/Desktop/ns-allinone-2.35/bin:/home/faysal/Desktop/ns-allinone-2.35/tcl8.5.10/unix:/home/faysal/Desktop/ns-allinone-2.35/tk8.5.10/unix
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/faysal/Desktop/ns-allinone-2.35/otcl-1.14:/home/faysal/Desktop/ns-allinone-2.35/lib
TCL_LIBRARY=$TCL_LIBRARY:/home/faysal/Desktop/ns-allinone-2.35/tcl8.5.10/library

export TCL_LIBRARY

When i run command ulimit -a . This is the output :

core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 14703
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 14703
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

knudfl · 10-11-2014, 04:12 PM

Welcome to LQ.

Delete the nam-1.15/ folder in ns-allinone-2.35/.
* I.e. the nam you can build from ns-allinone-2.xx/nam*/ often fails.
And the Ubuntu nam packages have been poor for some time.

Quote:

this are some few lines that i have added in the .bashrc file

No entries are required to .bashrc, when it is your computer.
The old 1999 text is about using the University Computer.
This will do : $ cd ns-allinone-2.35/ns-2.35/ && sudo make install

Ubuntu 14.04 ( x86_64) : ns2 prefers a 32bits OS.
However, the most protocols will also work with a 64bits OS.

A nam that works on your 64bits OS : nam_1.15-10-ubuntu14_amd64.deb
Download from https://drive.google.com/file/d/0B7S...ew?usp=sharing
→ → Click the package, when downloaded,
and your 'Package Installer' will install it.

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faysal · 10-11-2014, 04:19 PM

Thnx For your help

geethuthulasidas · 01-14-2016, 11:13 PM

Quote:

Originally Posted by knudfl

Welcome to LQ.

Delete the nam-1.15/ folder in ns-allinone-2.35/.
* I.e. the nam you can build from ns-allinone-2.xx/nam*/ often fails.
And the Ubuntu nam packages have been poor for some time.

No entries are required to .bashrc, when it is your computer.
The old 1999 text is about using the University Computer.
This will do : $ cd ns-allinone-2.35/ns-2.35/ && sudo make install

Ubuntu 14.04 ( x86_64) : ns2 prefers a 32bits OS.
However, the most protocols will also work with a 64bits OS.

A nam that works on your 64bits OS : nam_1.15-10-ubuntu14_amd64.deb
Download from https://drive.google.com/file/d/0B7S...ew?usp=sharing
→ → Click the package, when downloaded,
and your 'Package Installer' will install it.

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I had the same problem of segmentation fault while running nam. mine is 64 bit.ubuntu is 14.04. i downloaded the nam_1.15-10-ubuntu14_amd64.deb as said in the post. but now it is showing "bash: /usr/bin/nam: No such file or directory
"...can anyone help

knudfl · 01-15-2016, 11:44 AM

Re #4.

Quote:

i downloaded the nam_1.15-10-ubuntu14_amd64.deb

See #2 : Click the package, when downloaded,
and your 'Package Installer' will install it.

Then please try :
1) $ which nam
2) $ file /usr/local/bin/nam ( There should be no /usr/bin/nam ).
3) $ uname -m

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