Peerconnection_client example segmentation fault

[david-bui]

Hello, I tried to run peerconnection_client example linked with libwebrtc.a but I end up with a segmentation fault. I am running on a Unix machine 16.04.1-Ubuntu x86_64.

After running your script, I run the attached CMakeLists.txt in a different directory :

(dev)⚡ % cmake ..     /storage/Cosmo/libwebrtc_aisouard/libwebrtc/WorkingDir/out
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1") 
-- Checking for module 'gtk+-3.0'
-- Found gtk+-3.0, version 3.20.8
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE  
-- Configuring done
-- Generating done
-- Build files have been written to: /storage/Cosmo/libwebrtc_aisouard/libwebrtc/WorkingDir/out

Then make :

(dev)⚡ % make                                  /storage/Cosmo/libwebrtc_aisouard/libwebrtc/WorkingDir/out
Scanning dependencies of target ex_lib
[ 14%] Building CXX object CMakeFiles/ex_lib.dir/storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/conductor.cc.o
[ 28%] Building CXX object CMakeFiles/ex_lib.dir/storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/defaults.cc.o
[ 42%] Building CXX object CMakeFiles/ex_lib.dir/storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/peer_connection_client.cc.o
[ 57%] Linking CXX static library libex_lib.a
[ 57%] Built target ex_lib
Scanning dependencies of target peerconnection_client
[ 71%] Building CXX object CMakeFiles/peerconnection_client.dir/storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/linux/main.cc.o
[ 85%] Building CXX object CMakeFiles/peerconnection_client.dir/storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/linux/main_wnd.cc.o
/storage/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/linux/main_wnd.cc: In member function ‘virtual void GtkMainWnd::SwitchToConnectUI()’:
/storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/linux/main_wnd.cc:248:23: warning: ‘GtkWidget* gtk_alignment_new(gfloat, gfloat, gfloat, gfloat)’ is deprecated [-Wdeprecated-declarations]
   GtkWidget* valign = gtk_alignment_new(0, 1, 0, 0);
                       ^
In file included from /usr/include/gtk-3.0/gtk/gtk.h:248:0,
                 from /storage/Cosmo/libwebrtc_aisouard/libwebrtc/out/webrtc/src/webrtc/examples/peerconnection/client/linux/main_wnd.cc:14:
/usr/include/gtk-3.0/gtk/deprecated/gtkalignment.h:79:12: note: declared here
 GtkWidget* gtk_alignment_new        (gfloat             xalign,
            ^

[More Gtk warnings]

[100%] Linking CXX executable peerconnection_client
[100%] Built target peerconnection_client

When I run the code and then I press Connect :

 (dev)⚡ % ./peerconnection_client     /storage/Cosmo/libwebrtc_aisouard/libwebrtc/WorkingDir/out
[1]    7813 segmentation fault (core dumped)  ./peerconnection_client

In gdb :

Thread 1 "peerconnection_" received signal SIGSEGV, Segmentation fault.
0x0000000000426e99 in sigslot::lock_blocksigslot::single_threaded::lock_block (this=0x7fffffffb450,
mtx=0x1329710) at /usr/local/include/webrtc/base/sigslot.h:257
257				m_mutex->lock();

Is it linked to Gtk deprecated functions ?

Thank you

CMakeLists.txt

[agouaillard]

More background info:

• we used your scripts
• we took the example code that come shipped with libwebrtc out.
• we compiled libwertc separately and installed it
• we then tried to build the example code separately using the provided cmakelists, and linked against the installed version of libwebrtc.

it failed.

as a check, and to have a basis for comparison, we also compiled libwebrtc using the instructions at webrtc.org, switched to release-branch 57, and did the same thing as above, and it worked.

1. can you reproduce the problem?
2. any idea what we are doing wrong?

[aisouard]

I'm not sure about what's going on here, I needed to add these lines:

  ${ex_ROOT}/../../../base/asyncsocket.cc
  ${ex_ROOT}/../../../base/messagehandler.cc
  ${ex_ROOT}/../../../base/physicalsocketserver.cc

Please type the following line before running the process in gdb:

set follow-fork-mode child

Then send me the whole input, I'm building peerconnection_server in the meantime.

[aisouard]

I'm having this right now:

Thread 1 "peerconnection_" received signal SIGSEGV, Segmentation fault.
0x00007ffff5f2b58f in std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) bt
#0  0x00007ffff5f2b58f in std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*) () at /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#1  0x0000000000428099 in void std::list<sigslot::_opaque_connection, std::allocator<sigslot::_opaque_connection> >::_M_insert<sigslot::_opaque_connection>(std::_List_iterator<sigslot::_opaque_connection>, sigslot::_opaque_connection&&) ()
#2  0x0000000000427751 in std::list<sigslot::_opaque_connection, std::allocator<sigslot::_opaque_connection> >::push_back(sigslot::_opaque_connection&&) ()
#3  0x0000000000426f77 in void sigslot::signal_with_thread_policy<sigslot::single_threaded, rtc::AsyncResolverInterface*>::connect<PeerConnectionClient>(PeerConnectionClient*, void (PeerConnectionClient::*)(rtc::AsyncResolverInterface*)) ()
#4  0x0000000000423543 in PeerConnectionClient::Connect(std::string const&, int, std::string const&) ()
#5  0x0000000000415906 in Conductor::StartLogin(std::string const&, int) ()
#6  0x000000000040e5b2 in GtkMainWnd::OnClicked(_GtkWidget*) ()

[aisouard]

By the way, you should use GTK2 to avoid deprecated warnings and strange behaviour.

[aisouard]

I'll try to replace the sample with peerconnection on my side tonight GMT+2

Le 18 mai 2017 18:17:07 GMT+02:00, alex gouaillard [email protected] a écrit :

More background info:

• we used your scripts
• we took the example code that come shipped with libwebrtc out.
• we compiled libwertc separately and installed it
• we then tried to build the example code separately using the provided cmakelists, and linked against the installed version of libwebrtc.

it failed.

as a check, and to have a basis for comparison, we also compiled libwebrtc using the instructions at webrtc.org, switched to release-branch 57, and did the same thing as above, and it worked.

1. can you reproduce the problem?
2. any idea what we are doing wrong?

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[demobin8]

same error, i'm using gtk-2.0

Thread 1 "main" received signal SIGSEGV, Segmentation fault.
0x00000000004115b9 in sigslot::lock_block<sigslot::single_threaded>::lock_block (this=0x7fffffffbf70, 
    mtx=0x1210b30) at ../libwebrtc/include/webrtc/base/sigslot.h:257
257				m_mutex->lock();

ps: use ip address to avoid name resolver will skip the problem for temporary.

[rengaopan]

Hi，Is this problem solved?