Gotcha! The command that overwrote the batch was an XY_COLOR_BLT with
RGB-only writes (no alpha). This is only used by intelClearWithBlit for
GL_DEPTH_BUFFER (no stencil) clears. Looking over the code, the
implication is that (x1, y1), (x2, y2) are beyond the bounds of the
buffer.
diff --git a/src/mesa/drivers/dri/intel/intel_blit.c
b/src/mesa/drivers/dri/intel/intel_blit.c
index 1369e63..6269673 100644
--- a/src/mesa/drivers/dri/intel/intel_blit.c
+++ b/src/mesa/drivers/dri/intel/intel_blit.c
@@ -288,6 +288,8 @@ intelClearWithBlit(struct gl_context *ctx, GLbitfield mask)
y1 = cy + irb->draw_y;
x2 = cx + cw + irb->draw_x;
y2 = cy + ch + irb->draw_y;
+ assert(x1 >= 0 && y1 >= 0);
+ assert(x2 <= region->pitch && y2 * region->pitch * region->cpp <=
region->bo->size);
pitch = region->pitch;
cpp = region->cpp;
--
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https://bugs.launchpad.net/bugs/980325
Title:
[i965gm] False GPU lockup render.IPEHR: 0x7b000000
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