Cannot run wireless example after moving it to scratch directory

[S Developer]

I'm trying to run the wifi-spatial-reuse example and making some changes in the code by moving it to the scratch directory and renaming it as wifi-spatial-reuse-edit. The original version in the examples directory works but the new one does not build and gives an error

assert failed. cond="uid != 0", msg="Assert in TypeId::LookupByName: ns3::UdpSocketFactory not found", +0.000000000s -1 file=/media/abhishek.s4/Data/Developer/ns3/source/ns-3.36.1/src/core/model/type-id.cc, line=833
terminate called without an active exception
Command 'build/scratch/ns3.36.1-wifi-spatial-reuse-edit-default' died with <Signals.SIGABRT: 6>.

[Tom Henderson]

I don't know why that program is not linked to the internet module
library (I will ask Gabriel about it), but in the meantime, there is a
simple fix. Delete this statement (which is an unused variable):

TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");

- Tom

[Gabriel Ferreira]

Hmm, quite the unexpected issue popping out this late. 

I have forgotten to forcefully link unused shared libraries... 

diff --git a/scratch/CMakeLists.txt b/scratch/CMakeLists.txt
--- a/scratch/CMakeLists.txt    (revision 8bac4ffb586ef1c3ea0d5f6ee3b38519f18e4e3f)
+++ b/scratch/CMakeLists.txt    (revision 5baf7f88bbbb11c1c60071f0c1f0b981c486c919)
@@ -52,8 +52,8 @@
     )
   else()
     target_link_libraries(
-      ${target_prefix}${scratch_name} "${ns3-libs}" "${ns3-contrib-libs}"
-      "${ns3-external-libs}"
+      ${target_prefix}${scratch_name} ${LIB_AS_NEEDED_PRE} "${ns3-libs}" "${ns3-contrib-libs}"
+      "${ns3-external-libs}" ${LIB_AS_NEEDED_POST}
     )
   endif()
   set_runtime_outputdirectory(

[Gabriel Ferreira]

Fix merged in https://gitlab.com/nsnam/ns-3-dev/-/commit/63288690bbc1a98f1e97d4fd154729bd65eba75e

[S Developer]

Thank you Tom and Gabriel, that fixed the issue and now the script runs fine.

[naish...@gmail.com]

Hello Sir,

pls let me know whether  this fix is updated in ns.3.36.1 which is available in the website? I'm still getting the error  "assert failed. cond="uid != 0", msg="Assert in TypeId::LookupByName: ns3::UdpSocketFactory not found", +0.000000000s -1 file=/media/abhishek.s4/Data/Developer/ns3/source/ns-3.36.1/src/core/model/type-id.cc, line=833

terminate called without an active exception "

And I downloaded the latest version i.e ns3.36.1 today.

[Tom Henderson]

On 8/26/22 01:33, naish...@gmail.com wrote:
> Hello Sir,
> pls let me know whether  this fix is updated in ns.3.36.1 which is
> available in the website? I'm still getting the error  "assert failed.
> cond="uid != 0", msg="Assert in TypeId::LookupByName:
> ns3::UdpSocketFactory not found", +0.000000000s -1
> file=/media/abhishek.s4/Data/Developer/ns3/source/ns-3.36.1/src/core/model/type-id.cc,
> line=833
> terminate called without an active exception "
>
> And I downloaded the latest version i.e ns3.36.1 today.

That fix is not in ns-3.36.1 but it will be in ns-3.37 (planned for
September). You will have to patch ns-3.36.1 source code yourself. The
URL that Gabriel shared contains the changes necessary to make.

- Tom

[naish...@gmail.com]

Thanks for the reply Sir.

Made the changes suggested by Gabriel and its working fine.

Thankyou Tom and Gabriel.

[Abdelkader Gnichi]

i'm using ns-3.37 i have this issue below, also i try the patch provided by Gabriel and mentioned by Tom but it didn't work for me and i still have that error i copy the ofswitch13-first file to scratch and changed it name to myofswitch13-first, please if can anyone help me here i will appreciate it.

Thanks in advance.

assert failed. cond="itSrc->second == inPort", msg="Inconsistent L2 switching table", +1.004683364s 14 file=/home/gadour/source/ns-3.37/contrib/ofswitch13/model/ofswitch13-learning-controller.cc, line=148

terminate called without an active exception

Command 'build/scratch/ns3.37-myofswitch13-first-debug' died with <Signals.SIGABRT: 6>.

[Tom Henderson]

The assert is a new problem, possibly a mis-configuration of the scenario.  I think the patch provided by Gabriel helped, but you now have a different error.  I don't know about the file 'ofswitch13-first' so it is hard to guess what might be the problem below, but the assert message is trying to give you a hint as to what may be wrong.

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[Abdelkader Gnichi]

Hi Tom i'am so thankful for your response

actually i try to rename the file with it's original name but the same error still showing up i think that i made a mistake with the scenario but i'm not sure where the problem came from can i please send you the code maybe you can help me ?

i made some changes on the original code i put 7 nodes (as client) and 7 node as ofswitche13 switches switches and i set up the ping app betwen the first and last clients  nodes. 

[Tom Henderson]

I can try to help but please do not email me (or the list) a bunch of
files to add to ns-3.  If you want help, please post a branch on GitLab
or GitHub on a repository that I can clone, and please tell me exactly
how to run the program to reproduce the error.  In other words, you
should be able to tell me:

1) clone the following repository ...
2) checkout the following branch ...
3) run the following program exactly like this ...

Note, this is a general piece of advice in getting help from one of the
maintainers for issues like this-- please make it easy for us to set up
your environment.

[Abdelkader Gnichi]

Hi Tom i upload the script here in this link https://github.com/Abdelkader-gnichi/myofswitch13-first on github.

In the readme.md file you will find all the necessary steps to run the myofswitch-first.cc file and reproduce the error. 

thank you in advance Mr Tom i really appreciate it.

[Abdelkader Gnichi]

Hi Tom,

did you try to run my script that i put it on github i really wait your response about that script because until now i'm not able to find the error.

and thanks

[Raouane Dehimi]

hello everyone i have this error i can't fix it 

[0/2] Re-checking globbed directories...
ninja: no work to do.
NS_ASSERT failed, cond="m_ptr", msg="Attempted to dereference zero pointer", +0.000000000s -1 file=/home/raouane/ns-allinone-3.38/ns-3.38/src/core/model/ptr.h, line=752
NS_FATAL, terminating

terminate called without an active exception

Command 'build/scratch/ns3.38-examreti-default' died with <Signals.SIGABRT: 6>.

[Tommaso Pecorella]

I'd strongly suggest to:

1) Read the posting guidelines

2) Do not reply to random threads - the chances to be ignored are extremely high (also because ppl get angry and they don't reply when they're angry)

3) Learn to use a debugger.

4) Repeat points 1, 2, and 3 until you understand.

5) Repeat points 1, 2, and 3 once more, just to be sure.

About your error, I did find it right away, but I won't tell you exactly where it is - because... see point 1.

However, I *will* tell you that you forgot to create the wifi channel. So, basically... you have also to learn to copy the examples without missing pieces.