(gdb) bt full
#0  0x00007fe8a05eacf7 in sched_yield () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007fe89c25c471 in nouveau_fence_wait (fence=0x7fe8a4b7ef30) at ../../../../../../src/gallium/drivers/nouveau/nouveau_fence.c:213
        screen = 0x7fe8a4b60e00
        spins = 16664648
#2  0x00007fe89c23ed45 in nvc0_screen_destroy (pscreen=0x7fe8a4b60e00) at ../../../../../../src/gallium/drivers/nvc0/nvc0_screen.c:343
No locals.
#3  0x00007fe89c16a03f in dri_destroy_screen_helper (screen=screen@entry=0x7fe8a4b60ce0)
    at ../../../../../../../src/gallium/state_trackers/dri/drm/dri_screen.c:370
No locals.
#4  0x00007fe89c16a0c5 in dri_destroy_screen (sPriv=0x7fe8a4b60ae0) at ../../../../../../../src/gallium/state_trackers/dri/drm/dri_screen.c:380
No locals.
#5  0x00007fe89c166a1b in driDestroyScreen (psp=0x7fe8a4b60ae0) at ../../../../../../src/mesa/drivers/dri/common/dri_util.c:138
No locals.
#6  0x00007fe89c917497 in __glXDRIscreenDestroy (baseScreen=0x7fe8a4b54c20) at ../../glx/glxdri2.c:379
        i = <optimized out>
        screen = 0x7fe8a4b54c20
#7  0x00007fe89c90f006 in glxCloseScreen (pScreen=0x7fe8a4b0d860) at ../../glx/glxscreens.c:186
No locals.
#8  0x00007fe8a2849677 in main (argc=9, argv=0x7fffae6745a8, envp=<optimized out>) at ../../dix/main.c:351
        i = 0
        alwaysCheckForInput = {0, 1}