https://bugs.freedesktop.org/show_bug.cgi?id=82671
Priority: medium
Bug ID: 82671
Assignee: dri-devel at lists.freedesktop.org
Summary: [r600g-evergreen][compute]Empty kernel execution
causes crash
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: damien.hilloulin at supelec.fr
Hardware: All
Status: NEW
Version: git
Component: Drivers/Gallium/r600
Product: Mesa
Created attachment 104687
--> https://bugs.freedesktop.org/attachment.cgi?id=104687&action=edit
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.
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