Game bring-up: Forspoken (PPSA03984): intermittent stop on a sampled mip chain over its depth surface

[milescoviello]

Status: on main it sometimes stops in its opening on one sampled depth read: 2 of the 19 runs I made on 2026-10-24, and 3 of the 196 runs I have logs of. #10854 handles that read.

Setup

• Title: Forspoken (PPSA03984)
• Linux: Ubuntu 26.04.1 (kernel 7.0), i7-13700K, RTX 4070 Ti, NVIDIA 615.71.09, GCC 15.2, release libs, 16 GB memory cap, pad input

The intermittent stop

AGC graphics: sampling the depth plane of depth surface 0xa22c040000 (1920x1080, vk format 130) as a 1920x1080 texture of guest format 22 (vk 100), tile mode 7, dimension 1, levels 0-4, slice 0 is not implemented

The T# describes a 5-level R32 float chain at the base of the title's single-level 1920x1080 D32 depth surface. The title builds that chain with compute passes that write it as storage images. In the runs that don't stop, those pending results have already reached memory when the view is sampled, so the depth surface is retired and the view is read from guest memory. The stop is the same sample taken before they reach memory.

Pull requests from this title

• fix(agc): count pending storage writes over a depth plane as a later writer #10854: pending storage writes over a depth plane count as a later writer, so that view retires the surface whether or not the results have reached memory yet. All 4 runs of 250 s with it ran to the timeout. The race is rare, so those runs don't show the stop being fixed, only that the change doesn't break the opening.

AI-assisted: yes (Claude Code)