mesa: dc0bd799cabdd974b05bd217304944392169fb50 (master 10.4.0-devel)

$ ./bin/arb_explicit_uniform_location-use-of-unused-loc -auto
Segmentation fault (core dumped)

(gdb) bt
#0  validate_uniform_parameters (ctx=0x7f9e53f46010, shProg=0x1def900, location=0, count=1, array_index=0x7fff84c82c7c, 
    caller=0x7f9e4e6c8e46 "glUniform", negative_one_is_not_valid=false) at ../../src/mesa/main/uniform_query.cpp:272
#1  0x00007f9e4e48b089 in _mesa_uniform (ctx=0x7f9e53f46010, shProg=0x1def900, location=0, count=count@entry=1, 
    values=values@entry=0x7fff84c82ccc, type=type@entry=5124) at ../../src/mesa/main/uniform_query.cpp:618
#2  0x00007f9e4e487bc9 in _mesa_Uniform1i (location=<optimized out>, v0=1) at ../../src/mesa/main/uniforms.c:181
#3  0x00007f9e53a952e9 in stub_glUniform1i (location=0, v0=1) at piglit/tests/util/piglit-dispatch-gen.c:52781
#4  0x0000000000400d2f in piglit_init (argc=1, argv=0x7fff84c82ee8)
    at piglit/tests/spec/arb_explicit_uniform_location/use-of-unused-loc.c:69
#5  0x00007f9e53ad731f in run_test (gl_fw=0x7f9e53d490c0 <glut_fw>, argc=1, argv=0x7fff84c82ee8)
    at piglit/tests/util/piglit-framework-gl/piglit_glut_framework.c:165
#6  0x00007f9e53abdfd0 in piglit_gl_test_run (argc=1, argv=0x7fff84c82ee8, config=0x7fff84c82db0)
    at piglit/tests/util/piglit-framework-gl.c:151
#7  0x0000000000400cb5 in main (argc=1, argv=0x7fff84c82ee8)
    at piglit/tests/spec/arb_explicit_uniform_location/use-of-unused-loc.c:36
(gdb) frame 0
#0  validate_uniform_parameters (ctx=0x7f9e53f46010, shProg=0x1def900, location=0, count=1, array_index=0x7fff84c82c7c, 
    caller=0x7f9e4e6c8e46 "glUniform", negative_one_is_not_valid=false) at ../../src/mesa/main/uniform_query.cpp:272
272	   if (uni->array_elements == 0 && count > 1) {
(gdb) print uni
$1 = (gl_uniform_storage * const) 0x0