crash log for WebKitWebProcess (pid 27195):

[New LWP 27195]
[New LWP 27208]
[New LWP 27207]
[New LWP 27209]
[New LWP 27200]
[New LWP 27212]
[New LWP 27215]
[New LWP 27213]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/home/clopez/webkit/webkit/WebKitBuild/Release/bin/WebKitWebProcess 16'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f1d4a7cf067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
[Current thread is 1 (Thread 0x7f1d41661a80 (LWP 27195))]

Thread 8 (Thread 0x7f1cf89ff700 (LWP 27213)):
#0  0x00007f1d4a879d3d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1d46e5f252 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f1d46e60b6f in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f1d46e60c81 in xcb_wait_for_reply () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007f1d4ca92327 in _XReply (dpy=dpy@entry=0xaaf230, rep=rep@entry=0x7f1cf89fe810, extra=extra@entry=0, discard=discard@entry=1) at ../../src/xcb_io.c:602
#5  0x00007f1d4ca76d6e in XGetGeometry (dpy=0xaaf230, d=109051910, root=0x7f1cf89fe8b0, x=0x7f1cf89fe8bc, y=0x7f1cf89fe8b8, width=0x7f1cf89fe8ac, height=0x7f1cf89fe8a8, borderWidth=0x7f1cf89fe8a4, depth=0x7f1cf89fe8a0) at ../../src/GetGeom.c:47
#6  0x00007f1d5463928c in _ZN7WebCore12GLContextGLX22defaultFrameBufferSizeEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#7  0x00007f1d53a202ea in _ZN6WebKit18ThreadedCompositor18tryEnsureGLContextEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#8  0x00007f1d53a204ff in _ZN6WebKit18ThreadedCompositor15renderLayerTreeEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#9  0x00007f1d53a1eae2 in _ZN6WebKit18CompositingRunLoop16updateTimerFiredEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#10 0x00007f1d5232d55a in _ZZN3WTF7RunLoop9TimerBaseC1ERS0_EN3$_38__invokeEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#11 0x00007f1d4daeed8d in g_main_dispatch () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3122
#12 g_main_context_dispatch () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3737
#13 0x00007f1d4daef128 in g_main_context_iterate () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3808
#14 0x00007f1d4daef442 in g_main_loop_run () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4002
#15 0x00007f1d5232d240 in _ZN3WTF7RunLoop3runEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#16 0x00007f1d5232c8e8 in _ZNSt17_Function_handlerIFvvEZN3WTF9WorkQueue18platformInitializeEPKcNS2_4TypeENS2_3QOSEE3$_0E9_M_invokeERKSt9_Any_data () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#17 0x00007f1d52301664 in _ZN3WTFL16threadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#18 0x00007f1d5232aeaa in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#19 0x00007f1d4f37f0a4 in start_thread (arg=0x7f1cf89ff700) at pthread_create.c:309
#20 0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7f1ce3bff700 (LWP 27215)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f1d4b10fc7c in _ZNSt18condition_variable4waitERSt11unique_lockISt5mutexE () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#2  0x00007f1d522fe4c5 in _ZN3WTF10ParkingLot21parkConditionallyImplEPKvRKNS_12ScopedLambdaIFbvEEERKNS3_IFvvEEENSt6chrono10time_pointINSC_3_V212steady_clockENSC_8durationIlSt5ratioILl1ELl1000000000EEEEEE () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#3  0x00007f1d51fb5842 in _ZN3JSC11JITWorklist9runThreadEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#4  0x00007f1d51fb5bac in _ZNSt17_Function_handlerIFvvEZN3JSC11JITWorklistC1EvE3$_0E9_M_invokeERKSt9_Any_data () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#5  0x00007f1d52301664 in _ZN3WTFL16threadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#6  0x00007f1d5232aeaa in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#7  0x00007f1d4f37f0a4 in start_thread (arg=0x7f1ce3bff700) at pthread_create.c:309
#8  0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7f1cfa1db700 (LWP 27212)):
#0  0x00007f1d4a879d3d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1d4daef0c4 in g_main_context_poll () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f1d4daef442 in g_main_loop_run () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4002
#4  0x00007f1d5232d240 in _ZN3WTF7RunLoop3runEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#5  0x00007f1d5232c8e8 in _ZNSt17_Function_handlerIFvvEZN3WTF9WorkQueue18platformInitializeEPKcNS2_4TypeENS2_3QOSEE3$_0E9_M_invokeERKSt9_Any_data () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#6  0x00007f1d52301664 in _ZN3WTFL16threadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#7  0x00007f1d5232aeaa in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#8  0x00007f1d4f37f0a4 in start_thread (arg=0x7f1cfa1db700) at pthread_create.c:309
#9  0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7f1d41072700 (LWP 27200)):
#0  0x00007f1d4f38618d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1d52332a35 in _ZN7bmalloc4Heap8scavengeERSt11unique_lockINS_11StaticMutexEENSt6chrono8durationIlSt5ratioILl1ELl1000EEEE () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#2  0x00007f1d523327b2 in _ZN7bmalloc4Heap18concurrentScavengeEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#3  0x00007f1d52334c26 in _ZN7bmalloc9AsyncTaskINS_4HeapEMS1_FvvEE13threadRunLoopEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#4  0x00007f1d523348a6 in _ZN7bmalloc9AsyncTaskINS_4HeapEMS1_FvvEE16threadEntryPointEPS4_ () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#5  0x00007f1d4b113970 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007f1d4f37f0a4 in start_thread (arg=0x7f1d41072700) at pthread_create.c:309
#7  0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7f1cfaffb700 (LWP 27209)):
#0  0x00007f1d4a879d3d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1d4daef0c4 in g_main_context_poll () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f1d4daef442 in g_main_loop_run () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4002
#4  0x00007f1d5232d240 in _ZN3WTF7RunLoop3runEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#5  0x00007f1d5232c8e8 in _ZNSt17_Function_handlerIFvvEZN3WTF9WorkQueue18platformInitializeEPKcNS2_4TypeENS2_3QOSEE3$_0E9_M_invokeERKSt9_Any_data () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#6  0x00007f1d52301664 in _ZN3WTFL16threadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#7  0x00007f1d5232aeaa in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#8  0x00007f1d4f37f0a4 in start_thread (arg=0x7f1cfaffb700) at pthread_create.c:309
#9  0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f1cfbffd700 (LWP 27207)):
#0  0x00007f1d4a879d3d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1d4daef0c4 in g_main_context_poll () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f1d4daef442 in g_main_loop_run () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4002
#4  0x00007f1d5232d240 in _ZN3WTF7RunLoop3runEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#5  0x00007f1d5232c8e8 in _ZNSt17_Function_handlerIFvvEZN3WTF9WorkQueue18platformInitializeEPKcNS2_4TypeENS2_3QOSEE3$_0E9_M_invokeERKSt9_Any_data () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#6  0x00007f1d52301664 in _ZN3WTFL16threadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#7  0x00007f1d5232aeaa in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#8  0x00007f1d4f37f0a4 in start_thread (arg=0x7f1cfbffd700) at pthread_create.c:309
#9  0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f1cfb7fc700 (LWP 27208)):
#0  0x00007f1d4a879d3d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1d4daef0c4 in g_main_context_poll () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f1d4daef442 in g_main_loop_run () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4002
#4  0x00007f1d5232d240 in _ZN3WTF7RunLoop3runEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#5  0x00007f1d5232c8e8 in _ZNSt17_Function_handlerIFvvEZN3WTF9WorkQueue18platformInitializeEPKcNS2_4TypeENS2_3QOSEE3$_0E9_M_invokeERKSt9_Any_data () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#6  0x00007f1d52301664 in _ZN3WTFL16threadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#7  0x00007f1d5232aeaa in _ZN3WTFL19wtfThreadEntryPointEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#8  0x00007f1d4f37f0a4 in start_thread (arg=0x7f1cfb7fc700) at pthread_create.c:309
#9  0x00007f1d4a88287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f1d41661a80 (LWP 27195)):
#0  0x00007f1d4a7cf067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007f1d4a7d0448 in __GI_abort () at abort.c:89
#2  0x00007f1d4db13fc5 in g_assertion_message () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gtestutils.c:2356
#3  0x00007f1d4db1404a in g_assertion_message_expr () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gtestutils.c:2371
#4  0x00007f1d556cd0c1 in owr_video_renderer_get_element () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/openwebrtc/local/owr_video_renderer.c:314
#5  0x00007f1d556cd18d in owr_video_renderer_constructed () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/openwebrtc/local/owr_video_renderer.c:360
#6  0x00007f1d4dbf4514 in g_object_new_internal () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/gobject/gobject.c:1814
#7  0x00007f1d4dbf60d5 in g_object_new_valist () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/gobject/gobject.c:2033
#8  0x00007f1d4dbf63e4 in g_object_new () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/gobject/gobject.c:1617
#9  0x00007f1d545ca91f in _ZN7WebCore30MediaPlayerPrivateGStreamerOwr15createVideoSinkEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#10 0x00007f1d545c9f02 in _ZN7WebCore30MediaPlayerPrivateGStreamerOwr4loadERNS_18MediaStreamPrivateE () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#11 0x00007f1d54204083 in _ZN7WebCore11MediaPlayer23loadWithNextMediaEngineEPKNS_18MediaPlayerFactoryE () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#12 0x00007f1d54204391 in _ZN7WebCore11MediaPlayer4loadEPNS_18MediaStreamPrivateE () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#13 0x00007f1d53f1897e in _ZN7WebCore16HTMLMediaElement12loadResourceERKNS_3URLERNS_11ContentTypeERKN3WTF6StringE () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#14 0x00007f1d53f17df1 in _ZN7WebCore16HTMLMediaElement19selectMediaResourceEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#15 0x00007f1d53f10728 in _ZN7WebCore16HTMLMediaElement23pendingActionTimerFiredEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#16 0x00007f1d541b1a16 in _ZN7WebCore12ThreadTimers24sharedTimerFiredInternalEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#17 0x00007f1d5232d55a in _ZZN3WTF7RunLoop9TimerBaseC1ERS0_EN3$_38__invokeEPv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#18 0x00007f1d4daeed8d in g_main_dispatch () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3122
#19 g_main_context_dispatch () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3737
#20 0x00007f1d4daef128 in g_main_context_iterate () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:3808
#21 0x00007f1d4daef442 in g_main_loop_run () at /home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/glib-2.44.1/glib/gmain.c:4002
#22 0x00007f1d5232d240 in _ZN3WTF7RunLoop3runEv () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#23 0x00007f1d53a14aad in _ZN6WebKit16ChildProcessMainINS_10WebProcessENS_14WebProcessMainEEEiiPPc () from /home/clopez/webkit/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#24 0x00007f1d4a7bbb45 in __libc_start_main (main=0x400d30 <main>, argc=2, argv=0x7ffec3c39b28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffec3c39b18) at libc-start.c:287
#25 0x0000000000400c59 in _start ()

STDERR: 
STDERR: warning: core file may not match specified executable file.
STDERR: 56	../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
STDERR: **
STDERR: ERROR:/home/clopez/webkit/webkit/WebKitBuild/DependenciesGTK/Source/openwebrtc/local/owr_video_renderer.c:314:owr_video_renderer_get_element: assertion failed: (flip)