(gdb) bt
#0  0x00007ffff653ecc9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff65420d8 in __GI_abort () at abort.c:89
#2  0x00007ffff6537b86 in __assert_fail_base (fmt=0x7ffff6688830 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7ffff76ac390 "!xcb_xlib_threads_sequence_lost",
    file=file@entry=0x7ffff76ac1db "../../src/xcb_io.c", line=line@entry=274, function=function@entry=0x7ffff76ac696 "poll_for_event") at assert.c:92
#3  0x00007ffff6537c32 in __GI___assert_fail (assertion=0x7ffff76ac390 "!xcb_xlib_threads_sequence_lost", file=0x7ffff76ac1db "../../src/xcb_io.c", line=274, function=0x7ffff76ac696 "poll_for_event")
    at assert.c:101
#4  0x00007ffff763cc69 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#5  0x00007ffff763ccfc in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#6  0x00007ffff763cfcd in _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#7  0x00007ffff763fc75 in _XGetRequest () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#8  0x00007ffff763fd6f in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#9  0x00007ffff763f55f in _XError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#10 0x00007ffff79524b3 in __glXSendErrorForXcb (dpy=0x60ef10, err=0x7fffa40123e0) at ../../../../src/glx/glx_error.c:83
#11 0x00007ffff794e950 in glXCreateContextAttribsARB (dpy=0x60ef10, config=0x698cb0, share_context=0x7a49b0, direct=<optimized out>, attrib_list=0x7fffb5ffadb0) at ../../../../src/glx/create_context.c:119
#12 0x00007ffff69032c4 in _create_context_with_flags (contextFlags=1, profileMask=1, minor=<optimized out>, major=4, share_context=0x7a49b0, fbconfig=0x698cb0, dpy=0x60ef10, context_glx=0x7fffcc005790)
    at gstglcontext_glx.c:176
#13 gst_gl_context_glx_create_context (context=0x7fffcc005790, gl_api=65539, other_context=<optimized out>, error=0x7fffb6ffb138) at gstglcontext_glx.c:243
#14 0x00007ffff68e2afe in gst_gl_context_create_thread (context=0x7fffcc005790) at gstglcontext.c:1290
#15 0x00007ffff6b8ef05 in g_thread_proxy (data=0x6e2190) at /build/buildd/glib2.0-2.40.2/./glib/gthread.c:764
#16 0x00007ffff62f2182 in start_thread (arg=0x7fffb5ffb700) at pthread_create.c:312
#17 0x00007ffff660247d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
