need help

[Hamza Kh]

Hi

I have integrate a C++ code in ns3, it's build successfully but there is a message bellow, please what does it mean that? and how can i resolve this problem?

thanks

Waf: Entering directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

Waf: Leaving directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

'build' finished successfully (29.559s)

Command ['/workspaces/ns-allinone-3.17/ns-3.17/build/scratch/myfirst'] terminated with signal SIGSEGV. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb --args %s <args>").

[Konstantinos]

http://www.nsnam.org/wiki/HOWTO_understand_and_find_cause_of_terminated_with_signal_errors

http://www.nsnam.org/docs/manual/html/troubleshoot.html

Use the debugger, move to newer NS-3 release.

[Hamza Kh]

after applying the folowing command 

root@bt:/workspaces/ns-allinone-3.17/ns-3.17# ./waf --run scratch/myfirst

Waf: Entering directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

Waf: Leaving directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

'build' finished successfully (21.292s)

Command ['/workspaces/ns-allinone-3.17/ns-3.17/build/scratch/myfirst'] terminated with signal SIGSEGV. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb --args %s <args>").

then after applying your suggestion, the output was: 

root@bt:/workspaces/ns-allinone-3.17/ns-3.17# ./waf --run scratch/myfirst --command-template="gdb --args %s"

Waf: Entering directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

Waf: Leaving directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

'build' finished successfully (3.229s)

Traceback (most recent call last):

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Scripting.py", line 97, in waf_entry_point

    run_commands()

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Scripting.py", line 155, in run_commands

    run_command('shutdown')

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Scripting.py", line 146, in run_command

    ctx.execute()

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Context.py", line 87, in execute

    self.recurse([os.path.dirname(g_module.root_path)])

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Context.py", line 128, in recurse

    user_function(self)

  File "/workspaces/ns-allinone-3.17/ns-3.17/wscript", line 913, in shutdown

    visualize=Options.options.visualize)

  File "/workspaces/ns-allinone-3.17/ns-3.17/wutils.py", line 215, in run_program

    return run_argv(execvec, env, cwd=cwd)

  File "/workspaces/ns-allinone-3.17/ns-3.17/wutils.py", line 132, in run_argv

    retval = subprocess.Popen(argv, env=proc_env, cwd=cwd).wait()

  File "/usr/lib/python2.6/subprocess.py", line 633, in __init__

    errread, errwrite)

  File "/usr/lib/python2.6/subprocess.py", line 1139, in _execute_child

    raise child_exception

OSError: [Errno 2] No such file or directory

the same output was for the following command:

root@bt:/workspaces/ns-allinone-3.17/ns-3.17# ./waf --run scratch/myfirst --command-template="valgrid %s"

Waf: Entering directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

Waf: Leaving directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

'build' finished successfully (3.382s)

Traceback (most recent call last):

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Scripting.py", line 97, in waf_entry_point

    run_commands()

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Scripting.py", line 155, in run_commands

    run_command('shutdown')

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Scripting.py", line 146, in run_command

    ctx.execute()

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Context.py", line 87, in execute

    self.recurse([os.path.dirname(g_module.root_path)])

  File "/workspaces/ns-allinone-3.17/ns-3.17/.waf-1.7.10-4f6df1d839dc35640834d81573053140/waflib/Context.py", line 128, in recurse

    user_function(self)

  File "/workspaces/ns-allinone-3.17/ns-3.17/wscript", line 913, in shutdown

    visualize=Options.options.visualize)

  File "/workspaces/ns-allinone-3.17/ns-3.17/wutils.py", line 215, in run_program

    return run_argv(execvec, env, cwd=cwd)

  File "/workspaces/ns-allinone-3.17/ns-3.17/wutils.py", line 132, in run_argv

    retval = subprocess.Popen(argv, env=proc_env, cwd=cwd).wait()

  File "/usr/lib/python2.6/subprocess.py", line 633, in __init__

    errread, errwrite)

  File "/usr/lib/python2.6/subprocess.py", line 1139, in _execute_child

    raise child_exception

OSError: [Errno 2] No such file or directory

please advice

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--
LCPTS Lab
Hamza KHEDDAR

[Konstantinos]

Please refrain from double posting.

Have you installed all required libraries for gdb or valgrind? 

Also try another method:

• First, setup your environment variables: ./waf --shell
• Then, run your program with gdb: gdb ./build/scratch/myfirst

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[Hamza Kh]

I check the installation of gdb, i didn't find it. i download and install gdb 7.8, the OS [error 2] disappear. thanks so much

Now we return to our original problem:

root@bt:/workspaces/ns-allinone-3.17/ns-3.17# ./waf --run myfirst --command-template="gdb --args %s"

Waf: Entering directory `/workspaces/ns-allinone-3.17/ns-3.17/build'
Waf: Leaving directory `/workspaces/ns-allinone-3.17/ns-3.17/build'

'build' finished successfully (4.423s)


(gdb) run
Starting program: /workspaces/ns-allinone-3.17/ns-3.17/build/scratch/myfirst
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0xb567bf20 in ?? () from /lib/tls/i686/cmov/libc.so.6

This is the output message after debugging the program, please help to analyze the problem.

thanks

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[Konstantinos]

Now you need to use the GDB to debug your code.

Follow the tutorial http://www.cs.cmu.edu/~gilpin/tutorial/ or any other gdb tutorial online to learn how to use the debugger.

If you are using Eclipse or any other IDE for your development, you can debug your code there which is easier (graphical environment).

[Hamza Kh]

after debugging

(gdb) backtrace
#0  0xb567bf20 in ?? () from /lib/tls/i686/cmov/libc.so.6

#1  0xb6801d5d in std::__copy_move<false, true, std::random_access_iterator_tag>::__copy_m<char> (
    __first=0x1 <error: Cannot access memory at address 0x1>, __last=0x0, __result=0x0)
    at /usr/include/c++/4.4/bits/stl_algobase.h:378
#2  0xb6800940 in std::__copy_move_a<false, char*, char*> (__first=0x1 <error: Cannot access memory at address 0x1>,
    __last=0x0, __result=0x0) at /usr/include/c++/4.4/bits/stl_algobase.h:397

#3  0xb67fe571 in std::__copy_move_a2<false, __gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char> > > > (__first=..., __last=..., __result=...)
    at /usr/include/c++/4.4/bits/stl_algobase.h:436

#4  0xb67fbb33 in std::copy<__gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char> > > > (__first=..., __last=..., __result=...)
    at /usr/include/c++/4.4/bits/stl_algobase.h:468

#5  0xb67f821a in std::vector<char, std::allocator<char> >::erase (this=0xbfffdb70, __position=...)
    at /usr/include/c++/4.4/bits/vector.tcc:137



/////////////////////////////// THIS PART CONCERN MY PROGRAM //////////////////////////////////////////////////////////////////////////////////

#6  0xb67e711f in ns3::Ipv4L3Protocol::BuildHeader (this=0x80b2888, source=..., destination=..., protocol=17 '\021',
    payloadSize=1032, ttl=64 '@', tos=0 '\000', mayFragment=true) at ../src/internet/model/ipv4-l3-protocol.cc:752


#7  0xb67e5ce3 in ns3::Ipv4L3Protocol::Send (this=0x80b2888, packet=..., source=..., destination=..., protocol=17 '\021',
    route=...) at ../src/internet/model/ipv4-l3-protocol.cc:651

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////



#8  0xb681839e in ns3::MemPtrCallbackImpl<ns3::Ptr<ns3::Ipv4>, void (ns3::Ipv4::*)(ns3::Ptr<ns3::Packet>, ns3::Ipv4Address, ns3::Ipv4Address, unsigned char, ns3::Ptr<ns3::Ipv4Route>), void, ns3::Ptr<ns3::Packet>, ns3::Ipv4Address, ns3::Ipv4Address, unsigned char, ns3::Ptr<ns3::Ipv4Route>, ns3::empty, ns3::empty, ns3::empty, ns3::empty>::operator() (this=0x80b35a8,
    a1=..., a2=..., a3=..., a4=17 '\021', a5=...) at ./ns3/callback.h:235

#9  0xb74a04bf in ns3::Callback<void, ns3::Ptr<ns3::Packet>, ns3::Ipv4Address, ns3::Ipv4Address, unsigned char, ns3::Ptr<ns---Type <return> to continue, or q <return> to quit---

#10 0xb6813587 in ns3::UdpL4Protocol::Send (this=0x80b3318, packet=..., saddr=..., daddr=..., sport=49153, dport=9,
    route=...) at ../src/internet/model/udp-l4-protocol.cc:453

#11 0xb6848ffa in ns3::UdpSocketImpl::DoSendTo (this=0x80b70c8, p=..., dest=..., port=9)
    at ../src/internet/model/udp-socket-impl.cc:601

#12 0xb68470d4 in ns3::UdpSocketImpl::DoSendTo (this=0x80b70c8, p=..., address=...)
    at ../src/internet/model/udp-socket-impl.cc:422

#13 0xb684676c in ns3::UdpSocketImpl::DoSend (this=0x80b70c8, p=...) at ../src/internet/model/udp-socket-impl.cc:386

#14 0xb6846114 in ns3::UdpSocketImpl::Send (this=0x80b70c8, p=..., flags=0)
    at ../src/internet/model/udp-socket-impl.cc:355

#15 0xb5f08048 in ns3::Socket::Send (this=0x80b70c8, p=...) at ../src/network/model/socket.cc:137

#16 0xb6eea02d in ns3::UdpEchoClient::Send (this=0x80b4bd8) at ../src/applications/model/udp-echo-client.cc:310

#17 0xb6eebccd in ns3::EventMemberImpl0::Notify (this=0x80b1f90) at ./ns3/make-event.h:94

#18 0xb5ce1cbe in ns3::EventImpl::Invoke (this=0x80b1f90) at ../src/core/model/event-impl.cc:45

#19 0xb5ce739b in ns3::DefaultSimulatorImpl::ProcessOneEvent (this=0x80b1b08)
    at ../src/core/model/default-simulator-impl.cc:140

#20 0xb5ce774c in ns3::DefaultSimulatorImpl::Run (this=0x80b1b08) at ../src/core/model/default-simulator-impl.cc:193

#21 0xb5ce2a83 in ns3::Simulator::Run () at ../src/core/model/simulator.cc:160

#22 0x0804f5f6 in main (argc=1, argv=0xbffff104) at ../scratch/myfirst.cc:69


////////////////////////////// BREAK POINT for #6 and #7 ///////////////////////////////////////////////////////////

(gdb) break ns3::Ipv4L3Protocol::BuildHeader
Breakpoint 1 at 0xb67ad484 (2 locations)

(gdb) break ns3::Ipv4L3Protocol::Send
Breakpoint 2 at 0xb67e473e: file ../src/internet/model/ipv4-l3-protocol.cc, line 572.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

PLEASE ADVICE

PS: before i integrate my program as a part of existing program: Ipv4L3Protocol, i tested this part via IDE it's work well  !

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[Tommaso Pecorella]

Hi,

mind trying to use 3.21 ? Perhaps it was a bug in 3.19 and it's now fixed.

Thanks,

T.