[Bug 91062] [SKL] fbo-depth-array causes GPU hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91062

--- Comment #4 from Neil Roberts <neil at linux.intel.com> ---
As indicated by Ben in comment 2, I think the failure is related to the fact
that it is creating a really large colour buffer (8192x8192) and has nothing to
do with the depth/stencil buffer. I can replicate a hang by running the really
simple test below:

https://raw.githubusercontent.com/bpeel/piglit/big-window/tests/fbo/big-window.c

If I run it a few times (fewer than 20) then it consistently hangs. This
doesn't use a depth or stencil buffer at all and just does a glClear on the
large colour buffer.

The width that it is using (8192) is a little bit special because that is the
point at which Mesa will switch to using a linear buffer instead of tiling (see
brw_tex_layout.c line 678). If I comment out that section so that it uses
y-tiling anyway then it doesn't hang any more.

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