(gdb) bt full
#0  0x00007f1eae180cf7 in sched_yield () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f1ea9df2471 in nouveau_fence_wait (fence=0x7f1eb0a6edc0) at ../../../../../../src/gallium/drivers/nouveau/nouveau_fence.c:213
        screen = 0x7f1eb0a50c90
        spins = 787006728
#2  0x00007f1ea9dd4d45 in nvc0_screen_destroy (pscreen=0x7f1eb0a50c90) at ../../../../../../src/gallium/drivers/nvc0/nvc0_screen.c:343
No locals.
#3  0x00007f1ea9d0003f in dri_destroy_screen_helper (screen=screen@entry=0x7f1eb0a50b70) at ../../../../../../../src/gallium/state_trackers/dri/drm/dri_screen.c:370
No locals.
#4  0x00007f1ea9d000c5 in dri_destroy_screen (sPriv=0x7f1eb0a50970) at ../../../../../../../src/gallium/state_trackers/dri/drm/dri_screen.c:380
No locals.
#5  0x00007f1ea9cfca1b in driDestroyScreen (psp=0x7f1eb0a50970) at ../../../../../../src/mesa/drivers/dri/common/dri_util.c:138
No locals.
#6  0x00007f1eaa4ad497 in __glXDRIscreenDestroy (baseScreen=0x7f1eb0a44ab0) at ../../glx/glxdri2.c:379
        i = <optimized out>
        screen = 0x7f1eb0a44ab0
#7  0x00007f1eaa4a5006 in glxCloseScreen (pScreen=0x7f1eb0a06900) at ../../glx/glxscreens.c:186
No locals.
#8  0x00007f1eb03df677 in main (argc=9, argv=0x7fff4252aa18, envp=<optimized out>) at ../../dix/main.c:351
        i = 0
        alwaysCheckForInput = {0, 1}
(gdb)