(gdb) bt
#0  0x00007f06f18a656d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f06e7bb4150 in poll (__timeout=-1, __nfds=1, __fds=0x7ffda5166050) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x562fa0a9a9a0, cond=cond@entry=0x7ffda5166170, vector=vector@entry=0x0, count=count@entry=0x0)
    at ../../src/xcb_conn.c:479
#3  0x00007f06e7bb5c0f in wait_for_reply (c=c@entry=0x562fa0a9a9a0, request=19654, e=e@entry=0x0) at ../../src/xcb_in.c:516
#4  0x00007f06e7bb5d22 in xcb_wait_for_reply (c=0x562fa0a9a9a0, request=19654, e=0x0) at ../../src/xcb_in.c:546
#5  0x00007f06d4d3923b in vl_dri2_screen_texture_from_drawable (vscreen=0x562fa0aad240, drawable=0x4200001)
    at ../../../../src/gallium/auxiliary/vl/vl_winsys_dri.c:194
#6  0x00007f06d4d36d1d in vlVdpPresentationQueueDisplay (presentation_queue=<optimized out>, surface=7, clip_width=1366, clip_height=768, 
    earliest_presentation_time=0) at ../../../../../src/gallium/state_trackers/vdpau/presentation.c:234
#7  0x0000562f9fb6c81a in ?? ()
#8  0x00000000a49da2a6 in ?? ()
#9  0x0000562f9fb233ee in ?? ()
#10 0x0000000000000000 in ?? ()