Thread 9 (Thread 0x7fff7effd700 (LWP 30558)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffc9e8d543 in JSC::GCThread::waitForNextPhase (
    this=this@entry=0x21eab20) at ../Source/JavaScriptCore/heap/GCThread.cpp:81
#2  0x00007fffc9e8d5d0 in JSC::GCThread::gcThreadMain (this=0x21eab20)
    at ../Source/JavaScriptCore/heap/GCThread.cpp:99
#3  0x00007fffca0938c1 in WTF::wtfThreadEntryPoint (param=0x28a2830)
    at ../Source/WTF/wtf/ThreadingPthreads.cpp:196
#4  0x00007ffff7bc4f8e in start_thread (arg=0x7fff7effd700)
    at pthread_create.c:311
#5  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 8 (Thread 0x7fff7f7fe700 (LWP 30557)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007fffca093ccc in WTF::ThreadCondition::timedWait (
    this=this@entry=0x7fffd88d01a0, mutex=..., absoluteTime=<optimised out>)
    at ../Source/WTF/wtf/ThreadingPthreads.cpp:400
#2  0x00007fffc9e8c66b in JSC::BlockAllocator::waitForRelativeTimeWhileHoldingLock (this=this@entry=0x7fffd88d0098, relative=<optimised out>)
    at ../Source/JavaScriptCore/heap/BlockAllocator.cpp:89
#3  0x00007fffc9e8c6a2 in JSC::BlockAllocator::waitForRelativeTime (
    this=0x7fffd88d0098, relative=<optimised out>)
    at ../Source/JavaScriptCore/heap/BlockAllocator.cpp:99
#4  0x00007fffc9e8c710 in JSC::BlockAllocator::blockFreeingThreadMain (
    this=0x7fffd88d0098)
    at ../Source/JavaScriptCore/heap/BlockAllocator.cpp:113
#5  0x00007fffca0938c1 in WTF::wtfThreadEntryPoint (param=0x2dc8ce0)
    at ../Source/WTF/wtf/ThreadingPthreads.cpp:196
#6  0x00007ffff7bc4f8e in start_thread (arg=0x7fff7f7fe700)
    at pthread_create.c:311
#7  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 7 (Thread 0x7fff7ffff700 (LWP 30555)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007ffff62e7935 in g_cond_wait_until (cond=cond@entry=0x4bbbee8, 
    mutex=mutex@entry=0x4bbbee0, end_time=end_time@entry=269942658758)
    at /build/buildd/glib2.0-2.36.0/./glib/gthread-posix.c:865
#2  0x00007ffff627db81 in g_async_queue_pop_intern_unlocked (queue=0x4bbbee0, 
    wait=wait@entry=1, end_time=269942658758)
    at /build/buildd/glib2.0-2.36.0/./glib/gasyncqueue.c:424
#3  0x00007ffff627e228 in g_async_queue_timeout_pop_unlocked (
    queue=<optimised out>, timeout=timeout@entry=500000)
    at /build/buildd/glib2.0-2.36.0/./glib/gasyncqueue.c:572
#4  0x00007ffff62cc5fa in g_thread_pool_wait_for_new_task (pool=0x3139e40)
    at /build/buildd/glib2.0-2.36.0/./glib/gthreadpool.c:264
#5  g_thread_pool_thread_proxy (data=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gthreadpool.c:298
#6  0x00007ffff62cbeb5 in g_thread_proxy (data=0x4ed8230)
    at /build/buildd/glib2.0-2.36.0/./glib/gthread.c:798
#7  0x00007ffff7bc4f8e in start_thread (arg=0x7fff7ffff700)
    at pthread_create.c:311
#8  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 6 (Thread 0x7fff85852700 (LWP 30549)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffcae4523b in WebCore::IconDatabase::syncThreadMainLoop (
    this=0x7fffd886ac00) at ../Source/WebCore/loader/icon/IconDatabase.cpp:1463
#2  0x00007fffcae45478 in WebCore::IconDatabase::iconDatabaseSyncThread (
    this=0x7fffd886ac00) at ../Source/WebCore/loader/icon/IconDatabase.cpp:1058
#3  0x00007fffca0938c1 in WTF::wtfThreadEntryPoint (param=0x4b28860)
    at ../Source/WTF/wtf/ThreadingPthreads.cpp:196
#4  0x00007ffff7bc4f8e in start_thread (arg=0x7fff85852700)
    at pthread_create.c:311
#5  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7fffc6055700 (LWP 30548)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffca07ea7d in WTF::TCMalloc_PageHeap::scavengerThread (
    this=0x7fffca354660 <WTF::pageheap_memory>)
    at ../Source/WTF/wtf/FastMalloc.cpp:2763
#2  0x00007fffca07eaa9 in WTF::TCMalloc_PageHeap::runScavengerThread (
    context=<optimised out>) at ../Source/WTF/wtf/FastMalloc.cpp:1933
#3  0x00007ffff7bc4f8e in start_thread (arg=0x7fffc6055700)
    at pthread_create.c:311
#4  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7fffe1651700 (LWP 30516)):
#0  0x00007ffff6fbf3cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ffff62a81dc in g_main_context_poll (n_fds=1, fds=0x7fffd40008c0, 
    timeout=-1, context=0x1b41b10, priority=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3995
#2  g_main_context_iterate (context=context@entry=0x1b41b10, 
    block=block@entry=1, dispatch=dispatch@entry=1, self=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3696
#3  0x00007ffff62a8304 in g_main_context_iteration (context=0x1b41b10, 
    may_block=may_block@entry=1)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3762
#4  0x00007ffff62a8361 in glib_worker_main (data=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:5427
#5  0x00007ffff62cbeb5 in g_thread_proxy (data=0x1acae30)
    at /build/buildd/glib2.0-2.36.0/./glib/gthread.c:798
#6  0x00007ffff7bc4f8e in start_thread (arg=0x7fffe1651700)
    at pthread_create.c:311
#7  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7fffe2154700 (LWP 30515)):
#0  0x00007ffff6fbf3cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ffff62a81dc in g_main_context_poll (n_fds=1, fds=0x7fffdc0010c0, 
    timeout=-1, context=0x1a4a1c0, priority=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3995
#2  g_main_context_iterate (context=context@entry=0x1a4a1c0, 
    block=block@entry=1, dispatch=dispatch@entry=1, self=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3696
#3  0x00007ffff62a8304 in g_main_context_iteration (context=0x1a4a1c0, 
    may_block=1) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3762
#4  0x00007fffe216ba1d in ?? ()
   from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#5  0x00007ffff62cbeb5 in g_thread_proxy (data=0x1a49d40)
    at /build/buildd/glib2.0-2.36.0/./glib/gthread.c:798
#6  0x00007ffff7bc4f8e in start_thread (arg=0x7fffe2154700)
    at pthread_create.c:311
#7  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fffeba86700 (LWP 30514)):
#0  0x00007ffff6fbf3cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ffff62a81dc in g_main_context_poll (n_fds=5, fds=0x7fffe400fa20, 
    timeout=-1, context=0xd7b670, priority=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3995
#2  g_main_context_iterate (context=0xd7b670, block=block@entry=1, 
    dispatch=dispatch@entry=1, self=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3696
#3  0x00007ffff62a86ba in g_main_loop_run (loop=0xd7b600)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3895
#4  0x00007ffff5bcc4f6 in gdbus_shared_thread_func (user_data=0xd7b640)
    at /build/buildd/glib2.0-2.36.0/./gio/gdbusprivate.c:278
#5  0x00007ffff62cbeb5 in g_thread_proxy (data=0xd77630)
    at /build/buildd/glib2.0-2.36.0/./glib/gthread.c:798
#6  0x00007ffff7bc4f8e in start_thread (arg=0x7fffeba86700)
    at pthread_create.c:311
#7  0x00007ffff6fcbe1d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7ffff7fc5740 (LWP 30510)):
#0  g_logv (log_domain=0x7ffff4040806 "Gdk", log_level=G_LOG_LEVEL_ERROR, 
    format=<optimised out>, args=args@entry=0x7fffffffad38)
    at /build/buildd/glib2.0-2.36.0/./glib/gmessages.c:981
#1  0x00007ffff62af492 in g_log (
    log_domain=log_domain@entry=0x7ffff4040806 "Gdk", 
    log_level=log_level@entry=G_LOG_LEVEL_ERROR, 
    format=format@entry=0x7ffff404c027 "%s")
    at /build/buildd/glib2.0-2.36.0/./glib/gmessages.c:1010
#2  0x00007ffff401dd2d in _gdk_x11_display_error_event (
    display=display@entry=0xd4b0b0, error=error@entry=0x7fffffffaed0)
    at /build/buildd/gtk+3.0-3.8.2/./gdk/x11/gdkdisplay-x11.c:2556
#3  0x00007ffff4028e11 in gdk_x_error (error=0x7fffffffaed0, xdisplay=0xd3e920)
    at /build/buildd/gtk+3.0-3.8.2/./gdk/x11/gdkmain-x11.c:303
#4  gdk_x_error (xdisplay=0xd3e920, error=0x7fffffffaed0)
    at /build/buildd/gtk+3.0-3.8.2/./gdk/x11/gdkmain-x11.c:266
#5  0x00007ffff3ad3636 in _XError (dpy=dpy@entry=0xd3e920, 
    rep=rep@entry=0x2d49ed0) at ../../src/XlibInt.c:1583
#6  0x00007ffff3ad0871 in handle_error (dpy=dpy@entry=0xd3e920, 
    err=err@entry=0x2d49ed0, in_XReply=in_XReply@entry=1)
    at ../../src/xcb_io.c:212
#7  0x00007ffff3ad08b5 in handle_response (dpy=dpy@entry=0xd3e920, 
    response=0x2d49ed0, in_XReply=in_XReply@entry=1) at ../../src/xcb_io.c:324
#8  0x00007ffff3ad14a8 in _XReply (dpy=dpy@entry=0xd3e920, 
    rep=rep@entry=0x7fffffffb070, extra=extra@entry=0, discard=discard@entry=1)
    at ../../src/xcb_io.c:626
#9  0x00007ffff3acce5d in XSync (dpy=0xd3e920, discard=discard@entry=0)
    at ../../src/Sync.c:44
#10 0x00007ffff3acceeb in _XSyncFunction (dpy=<optimised out>)
    at ../../src/Synchro.c:35
#11 0x00007ffff3aae63a in XCopyArea (dpy=0xd3e920, src_drawable=39846356, 
    dst_drawable=39846145, gc=0x1ff8b20, src_x=0, src_y=0, width=1, 
    height=200, dst_x=0, dst_y=0) at ../../src/CopyArea.c:61
#12 0x00007ffff3204f76 in _cairo_xlib_surface_put_shm (surface=0x4a4e530)
    at /build/buildd/cairo-1.12.14/src/cairo-xlib-surface-shm.c:1100
#13 0x00007ffff32006a9 in _cairo_xlib_surface_flush (
    abstract_surface=0x4a4e530, flags=1)
    at /build/buildd/cairo-1.12.14/src/cairo-xlib-surface.c:1500
#14 0x00007ffff31d2b8d in _cairo_surface_finish_snapshots (surface=0x4a4e530)
    at /build/buildd/cairo-1.12.14/src/cairo-surface.c:994
#15 cairo_surface_destroy (surface=0x4a4e530)
    at /build/buildd/cairo-1.12.14/src/cairo-surface.c:938
#16 INT_cairo_surface_destroy (surface=0x4a4e530)
    at /build/buildd/cairo-1.12.14/src/cairo-surface.c:924
#17 0x00007ffff31b80d8 in INT_cairo_pattern_destroy (pattern=0x2dbee30)
    at /build/buildd/cairo-1.12.14/src/cairo-pattern.c:1131
#18 0x00007ffff3195a27 in _cairo_gstate_fini (gstate=0x17ce030)
    at /build/buildd/cairo-1.12.14/src/cairo-gstate.c:225
#19 0x00007ffff31925fd in _cairo_default_context_fini (cr=cr@entry=0x17ce000)
    at /build/buildd/cairo-1.12.14/src/cairo-default-context.c:75
#20 0x00007ffff3192679 in _cairo_default_context_destroy (
    abstract_cr=0x17ce000)
    at /build/buildd/cairo-1.12.14/src/cairo-default-context.c:93
#21 0x00007fffca7dc174 in ~RefPtr (this=<synthetic pointer>, 
    __in_chrg=<optimised out>) at ../Source/WTF/wtf/RefPtr.h:56
#22 WebKit::ChromeClient::widgetSizeChanged (this=this@entry=0x4b6ae00, 
    oldWidgetSize=..., newSize=...)
    at ../Source/WebKit/gtk/WebCoreSupport/ChromeClientGtk.cpp:472
#23 0x00007fffca814c93 in resizeWebViewFromAllocation (
    webView=webView@entry=0x17cc5e0, 
    allocation=allocation@entry=0x7fffffffc170, sizeChanged=<optimised out>)
    at ../Source/WebKit/gtk/webkit/webkitwebview.cpp:877
#24 0x00007fffca814da9 in webkit_web_view_size_allocate (widget=0x17cc5e0, 
    allocation=0x7fffffffc170)
    at ../Source/WebKit/gtk/webkit/webkitwebview.cpp:894
#25 0x00007ffff656e7a0 in g_cclosure_marshal_VOID__BOXEDv (closure=0xd1ca70, 
    return_value=<optimised out>, instance=<optimised out>, 
    args=<optimised out>, marshal_data=<optimised out>, 
    n_params=<optimised out>, param_types=0xbf3900)
    at /build/buildd/glib2.0-2.36.0/./gobject/gmarshal.c:1160
#26 0x00007ffff656b81b in _g_closure_invoke_va (closure=0xd1ca70, 
    return_value=0x0, instance=0x17cc5e0, args=0x7fffffffc008, n_params=1, 
    param_types=0xbf3900)
    at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
#27 0x00007ffff65842df in g_signal_emit_valist (instance=0x17cc5e0, 
    signal_id=<optimised out>, detail=0, 
    var_args=var_args@entry=0x7fffffffc008)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
#28 0x00007ffff6584f92 in g_signal_emit (instance=instance@entry=0x17cc5e0, 
    signal_id=<optimised out>, detail=detail@entry=0)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
#29 0x00007ffff4532b8a in gtk_widget_size_allocate (
    widget=widget@entry=0x17cc5e0, allocation=allocation@entry=0x7fffffffc1f0)
    at /build/buildd/gtk+3.0-3.8.2/./gtk/gtkwidget.c:5341
#30 0x00007ffff44399c0 in gtk_offscreen_window_size_allocate (
    widget=0x1d82da0, allocation=0x7fffffffc7d0)
    at /build/buildd/gtk+3.0-3.8.2/./gtk/gtkoffscreenwindow.c:150
#31 0x00007ffff656b620 in g_closure_invoke (closure=0xd1ca70, 
    return_value=0x0, n_param_values=2, param_values=0x7fffffffc410, 
    invocation_hint=0x7fffffffc3b0)
    at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:777
#32 0x00007ffff657c544 in signal_emit_unlocked_R (node=node@entry=0xbf3920, 
    detail=detail@entry=0, instance=instance@entry=0x1d82da0, 
    emission_return=emission_return@entry=0x0, 
    instance_and_params=instance_and_params@entry=0x7fffffffc410)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3514
#33 0x00007ffff6584d11 in g_signal_emit_valist (instance=0x1d82da0, 
    signal_id=<optimised out>, detail=0, 
    var_args=var_args@entry=0x7fffffffc668)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3328
#34 0x00007ffff6584f92 in g_signal_emit (instance=instance@entry=0x1d82da0, 
    signal_id=<optimised out>, detail=detail@entry=0)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
#35 0x00007ffff4532b8a in gtk_widget_size_allocate (
    widget=widget@entry=0x1d82da0, allocation=allocation@entry=0x7fffffffc850)
    at /build/buildd/gtk+3.0-3.8.2/./gtk/gtkwidget.c:5341
#36 0x00007ffff44398d0 in gtk_offscreen_window_resize (widget=0x1d82da0)
    at /build/buildd/gtk+3.0-3.8.2/./gtk/gtkoffscreenwindow.c:206
#37 0x00007ffff656b8e7 in _g_closure_invoke_va (closure=0xd20ba0, 
    return_value=0x0, instance=0x1d82da0, args=0x7fffffffcb38, n_params=0, 
    param_types=0x0) at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
#38 0x00007ffff65842df in g_signal_emit_valist (instance=0x1d82da0, 
    signal_id=<optimised out>, detail=0, 
    var_args=var_args@entry=0x7fffffffcb38)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
#39 0x00007ffff6584f92 in g_signal_emit (instance=<optimised out>, 
    signal_id=<optimised out>, detail=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
#40 0x00007ffff43698ae in gtk_container_idle_sizer (clock=0x1bfab10, 
    container=0x1d82da0)
    at /build/buildd/gtk+3.0-3.8.2/./gtk/gtkcontainer.c:1671
#41 0x00007ffff656b8e7 in _g_closure_invoke_va (closure=0x21a2db0, 
    return_value=0x0, instance=0x1bfab10, args=0x7fffffffcf68, n_params=0, 
    param_types=0x0) at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
#42 0x00007ffff65842df in g_signal_emit_valist (
    instance=instance@entry=0x1bfab10, signal_id=signal_id@entry=139, 
    detail=detail@entry=0, var_args=var_args@entry=0x7fffffffcf68)
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
#43 0x00007ffff65854b9 in g_signal_emit_by_name (
    instance=instance@entry=0x1bfab10, 
    detailed_signal=detailed_signal@entry=0x7ffff4044fea "layout")
    at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3424
#44 0x00007ffff4000ff7 in gdk_frame_clock_paint_idle (data=0x1bfab10)
    at /build/buildd/gtk+3.0-3.8.2/./gdk/gdkframeclockidle.c:400
#45 0x00007ffff3ff3450 in gdk_threads_dispatch (data=0x4c1a920, 
    data@entry=<error reading variable: value has been optimised out>)
    at /build/buildd/gtk+3.0-3.8.2/./gdk/gdk.c:788
#46 0x00007ffff62a8b1b in g_timeout_dispatch (source=source@entry=0x20ab690, 
    callback=<optimised out>, user_data=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:4413
#47 0x00007ffff62a7f05 in g_main_dispatch (context=0xd39970)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3054
#48 g_main_context_dispatch (context=context@entry=0xd39970)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3630
#49 0x00007ffff62a8248 in g_main_context_iterate (context=0xd39970, 
    block=block@entry=1, dispatch=dispatch@entry=1, self=<optimised out>)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3701
#50 0x00007ffff62a86ba in g_main_loop_run (loop=0x227f5d0)
    at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3895
#51 0x00007ffff44030a5 in gtk_main ()
    at /build/buildd/gtk+3.0-3.8.2/./gtk/gtkmain.c:1156
#52 0x00007ffff58f9c18 in ffi_call_unix64 ()
   from /usr/lib/x86_64-linux-gnu/libffi.so.6
#53 0x00007ffff58f9580 in ffi_call ()
   from /usr/lib/x86_64-linux-gnu/libffi.so.6
#54 0x00007ffff67b3ce4 in g_callable_info_invoke ()
   from /usr/lib/libgirepository-1.0.so.1
#55 0x00007ffff67b504b in g_function_info_invoke ()
   from /usr/lib/libgirepository-1.0.so.1
#56 0x00007ffff69f0f0a in ?? () from /usr/lib/python2.7/dist-packages/gi/_gi.so
#57 0x000000000047d80a in PyEval_EvalFrameEx ()
#58 0x00000000004e1050 in PyEval_EvalCodeEx ()
#59 0x000000000047c034 in PyEval_EvalFrameEx ()
#60 0x00000000004e09aa in PyEval_EvalCodeEx ()
#61 0x0000000000540412 in PyEval_EvalCode ()
#62 0x000000000054088b in ?? ()
#63 0x00000000004658f6 in PyRun_FileExFlags ()
#64 0x0000000000465e26 in PyRun_SimpleFileExFlags ()
#65 0x0000000000466b9b in Py_Main ()
#66 0x00007ffff6ef3ea5 in __libc_start_main (main=0x466c51 <main>, argc=2, 
    ubp_av=0x7fffffffde78, init=<optimised out>, fini=<optimised out>, 
    rtld_fini=<optimised out>, stack_end=0x7fffffffde68) at libc-start.c:260
#67 0x00000000004e1635 in _start ()