malloc.c:3996 3996 malloc.c: No such file or directory

[tina]

Hi all,

I installed ns3-dce and i tested iperf. It worked perfectly. I have an application program to transfer a file from sender to receiver that works without any error completely on my laptop. 

1) In order to add it to dce, I have a cpp program very similar to iperf. I added it to ns3-dce/example.

2) I added the executable of application program to build/bin-dce

3)I added the example file information to ns-3-dc3/wscript

4) ./waf build is ok

 but when i want to run the program with ./waf --run (examplefile) i receive the following error:

Program received signal SIGSEGV, Segmentation fault.

0x00007fffed8b301f in _int_free (av=0x7fffedbf2760 <main_arena>, 

    p=<optimized out>, have_lock=0) at malloc.c:3996

3996 malloc.c: No such file or directory.

(gdb) bt

#0  0x00007fffed8b301f in _int_free (av=0x7fffedbf2760 <main_arena>, 

    p=<optimized out>, have_lock=0) at malloc.c:3996

#1  0x00007ffff7abe1bf in ns3::UcontextFiberManager::Delete (this=0x69d820, 

    fib=0x769210) at ../model/ucontext-fiber-manager.cc:255

#2  0x00007ffff7ac3cc7 in ns3::TaskManager::GarbageCollectDeadTasks (

    this=0x69d710) at ../model/task-manager.cc:177

#3  0x00007ffff7ac6911 in ns3::TaskManager::Schedule (this=0x69d710)

    at ../model/task-manager.cc:470

#4  0x00007ffff7ac8383 in ns3::EventImpl* ns3::MakeEvent<void (ns3::TaskManager::*)(), ns3::TaskManager*>(void (ns3::TaskManager::*)(), ns3::TaskManager*)::EventMemberImpl0::Notify() (this=0xa0b050)

    at /home/ns3/mptcp-0.89/mptcp/arch/sim/test/buildtop/build/include/ns3-dev/ns3/make-event.h:323

#5  0x00007ffff73564f7 in ns3::EventImpl::Invoke (this=0xa0b050)

    at ../src/core/model/event-impl.cc:51

#6  0x00007ffff735aebe in ns3::DefaultSimulatorImpl::ProcessOneEvent (

    this=0x6c3cb0) at ../src/core/model/default-simulator-impl.cc:149

#7  0x00007ffff735b238 in ns3::DefaultSimulatorImpl::Run (this=0x6c3cb0)

    at ../src/core/model/default-simulator-impl.cc:202

#8  0x00007ffff735722e in ns3::Simulator::Run ()

    at ../src/core/model/simulator.cc:205

#9  0x000000000040c56c in main (argc=2, argv=0x7fffffffd798)

    at ../example/dce-mmt.cc:187

(gdb) 

the most strange thing is that before (some months ago) it was running without any error perfectly. now I am trying again to run it but i can't. I am wondering if there is any other step that i have forgotten. Please guide me.

[Tommaso Pecorella]

Hi,

it seems like a memory corruption error. It could have been there also months ago, and you might have not noticed.

Memory corruption problems are highly dependent on the compiler, and a new one can highlight them.

Malloc, of course, is not the problem. It's just where the debugger gives up in the trace.

Happy bug hunting,

T.

[tina]

Hi Tommaso Thanks for your reply. Now, What is your suggestion? Do i have to reinstall the older compiler that i was used before? Do i have to try to solve this in the code?

[Tommaso Pecorella]

I'd solve it in the code. Use a debugger and valgrind, and find your memory leak.

Happy hunting,

T.

[tina]

I couldn't find  memory leak. So i tried to make the same environment as i used before, the same compiler and libs and other dependency. so i installed a new OS (14.04) and DCE 1.8 that i used before (instead of the last version). now it is working. Thanks for your guides.

[tina]

Hi ,

In order to use mptcp kernel, i did the instruction in "https://hub.docker.com/r/ns3dce/mptcp/~/dockerfile/". in part "make testbin" it will install bake.py configure -e dce-linux-inkernel". in order to avoid last upgrade, i changed it to "bake.py configure -e dce-linux-1.8 ". the installation is finished and the liblinux is made but the examples don't run currectly. for example, dce-iperf-mptcp works only with one path and for "  dce-mptcp-lte-wifi" i got the following error:
0x00007fffef2591fb in raise (sig=10)
    at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
37    ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.


could you please guide me