mesa: d120506e158e58b7a532c31427fe0a056ea270d8 (master 10.2.0-devel)

$ ./bin/clearbuffer-mixed-format -auto
src/gallium/drivers/llvmpipe/lp_rast.c:165:lp_rast_clear_color: Assertion `util_format_is_pure_uint(format)' failed.
Trace/breakpoint trap (core dumped)

(gdb) bt
#0  0x00007fb9e91c09f1 in _debug_assert_fail (expr=0x7fb9e9c3adf0 "util_format_is_pure_uint(format)", file=0x7fb9e9c3adc8 "src/gallium/drivers/llvmpipe/lp_rast.c", 
    line=165, function=0x7fb9e9c3afa0 <__func__.15884> "lp_rast_clear_color") at src/gallium/auxiliary/util/u_debug.c:278
#1  0x00007fb9e8ddb406 in lp_rast_clear_color (task=0x2417f08, arg=...) at src/gallium/drivers/llvmpipe/lp_rast.c:165
#2  0x00007fb9e8ddc702 in do_rasterize_bin (task=0x2417f08, bin=0x7fb9ec8f91e8, x=0, y=0) at src/gallium/drivers/llvmpipe/lp_rast.c:653
#3  0x00007fb9e8ddc76f in rasterize_bin (task=0x2417f08, bin=0x7fb9ec8f91e8, x=0, y=0) at src/gallium/drivers/llvmpipe/lp_rast.c:672
#4  0x00007fb9e8ddc87f in rasterize_scene (task=0x2417f08, scene=0x7fb9ec8f9010) at src/gallium/drivers/llvmpipe/lp_rast.c:721
#5  0x00007fb9e8ddcb4b in thread_function (init_data=0x2417f08) at src/gallium/drivers/llvmpipe/lp_rast.c:842
#6  0x00007fb9e8dda412 in impl_thrd_routine (p=0x2408060) at include/c11/threads_posix.h:87
#7  0x00007fb9e7d66f6e in start_thread (arg=0x7fb9e06fc700) at pthread_create.c:311
#8  0x00007fb9ec0429cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
(gdb) frame 1
#1  0x00007fb9e8ddb406 in lp_rast_clear_color (task=0x2417f08, arg=...) at src/gallium/drivers/llvmpipe/lp_rast.c:165
165	               assert(util_format_is_pure_uint(format));
(gdb) print format
$1 = PIPE_FORMAT_R8G8B8A8_UNORM