[Bug 42732] GL_OUT_OF_MEMORY followed by NULL dereference in FFXIV Heavensward Benchmark

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42732

--- Comment #12 from nospam at kota.moe ---
I've attached the /proc/.../maps of the benchmark in various circumstances (and
with ASLR turned off to make things a bit more comparable).

The most major change between the loading screen and the scene itself are lots
of added "/dev/dri/renderDxxx" and "/drm mm object (deleted)" maps.

Using the following command line to count the number of bytes mapped in by
these maps:
grep -E '/(dri|drm)' | cut -d' ' -f1 | awk -F- '{print strtonum("0x" $2) -
strtonum("0x" $1)}' | tr '\n' + | sed -E 's/\+$/\n/' | bc

We get the following numbers (loading, running/crashed, difference):
dGPU: 62, 77, 15 MiB
iGPU (unpatched): 199, 350, 151 MiB
iGPU (patched): 199, 529, 340 MiB

So indeed the dGPU seems to use less virtual memory than the iGPU, and the
crash is caused by failing to allocate the final 340 - 151 = 189 MiB of memory.

What strikes me as odd is in the unpatched case, all the dri/drm maps are
allocated in the lower 2 GiB of memory (in contrast to the patched case, where
most of it is in high memory). Isn't the native linux graphics driver
allocating this memory? Why would it be affected by the address space
limitations that wine imposes on Windows binaries?

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