Created attachment 104687 [details]
Bug repro program source file

I gave a shot to opencl support on my evergreen card (cedar) with mesa git.
I noticed that with an empty kernel the program crash with:
evergreen_state.c:1827:evergreen_emit_vertex_buffers: Assertion `rbuffer' failed.

I made a little debugging and I think that this is du to a bug in evergreen_init_compute_state_functions from evergreen_compute.c .

The two concerned lines are

/* We always use at least one vertex buffer for parameters (id = 1)*/
ctx->cs_vertex_buffer_state.enabled_mask =
ctx->cs_vertex_buffer_state.dirty_mask = 0x2;

With an empty kernel there is in fact no vertex buffer used as far as I can see.

By changing the two lines to
ctx->cs_vertex_buffer_state.enabled_mask =
ctx->cs_vertex_buffer_state.dirty_mask = 0x0;

It doesn't crash for me anymore.
However I am a total driver development noob so my interpretation (and therefore fix) can be wrong.

You can find attacted the very small program to be able to cause the crash.