d3d12: ======== test_shader_io_mismatch begin ========
d3d12: ../src/compiler/nir/nir_gather_xfb_info.c:104: add_var_xfb_outputs: Assertion `xfb->buffer_to_stream[buffer] == var->data.stream' failed.
Aborted (core dumped)

#version 450
layout(triangles) in;
layout(max_vertices = 3, points) out;

layout(xfb_buffer = 0, xfb_stride = 64, stream = 1) out gl_PerVertex
{
    layout(xfb_offset = 0) vec4 gl_Position;
};

invariant gl_Position;

layout(location = 1) in vec3 ARG[3];
layout(location = 2) in vec2 ARG_1[3];
layout(location = 3) in uvec4 ARG_2[3];
layout(location = 1, xfb_buffer = 0, xfb_stride = 64, xfb_offset = 16) out vec3 ARG_3;
layout(location = 2, xfb_buffer = 0, xfb_stride = 64, xfb_offset = 28) flat out uvec4 ARG_2_1;
layout(location = 4, xfb_buffer = 1, xfb_stride = 64, xfb_offset = 0, stream = 1) out vec2 ARG_1_1;

void main()
{
    uint _44;
    _44 = 0u;
    for (;;)
    {
        gl_Position.x = gl_in[_44].gl_Position.x;
        gl_Position.y = gl_in[_44].gl_Position.y;
        gl_Position.z = gl_in[_44].gl_Position.z;
        gl_Position.w = gl_in[_44].gl_Position.w;
        ARG_3.x = ARG[_44].x;
        ARG_3.y = ARG[_44].y;
        ARG_3.z = ARG[_44].z;
        ARG_2_1.x = ARG_2[_44].x;
        ARG_2_1.y = ARG_2[_44].y;
        ARG_2_1.z = ARG_2[_44].z;
        ARG_2_1.w = ARG_2[_44].w;
        EmitStreamVertex(int(0u));
        uint _45 = _44 + 1u;
        if (_45 == 3u)
        {
            break;
        }
        else
        {
            _44 = _45;
        }
    }
    gl_Position.x = gl_in[0u].gl_Position.x;
    gl_Position.y = gl_in[0u].gl_Position.y;
    gl_Position.z = gl_in[0u].gl_Position.z;
    gl_Position.w = gl_in[0u].gl_Position.w;
    ARG_1_1.x = ARG_1[0u].x;
    ARG_1_1.y = ARG_1[0u].y;
    EmitStreamVertex(int(1u));
}

The Vulkan spec says:

"VUID-StandaloneSpirv-Stream-04694
If any variables or block members in the output interface of the entry point being compiled are decorated with Stream, then all variables belonging to the same XfbBuffer must specify the same Stream value"

I think it's a test bug.