Comment 2 for bug 1507159

StacktraceTop:
 pixman_region_fini (region=region@entry=0x56553bd476c9) at ../../pixman/pixman-region.c:416
 __sna_damage_all (damage=0x56553bd476c1, width=1920, height=1080) at ../../../src/sna/sna_damage.c:1039
 _sna_damage_all (height=<optimized out>, width=<optimized out>, damage=<optimized out>) at ../../../src/sna/sna_damage.h:38
 apply_damage (region=0x7ffc671236b0, op=0x7ffc671236c0) at ../../../src/sna/sna_composite.c:449
 sna_composite (op=<optimized out>, src=<optimized out>, mask=0x0, dst=<optimized out>, src_x=<optimized out>, src_y=<optimized out>, mask_x=0, mask_y=0, dst_x=0, dst_y=0, width=1920, height=1080) at ../../../src/sna/sna_composite.c:767