expert_load's fslab-OOM unwind freed s->slab via compat_aligned_free without
coli_metal_unregister -- a pre-existing gap on main/dev (validator-confirmed
during E4) that leaves a stale g_slabs entry over freed memory, letting
resolve() hand the GPU a dangling pointer. Under COLI_METAL_RESSET=1 the
exposure is strictly longer-lived: the wrapped buffer would stay a permanent
residency-set member over the freed pages instead of stock's transient
last-command-buffer window. Ported from e4/metal-heap validator fix 6753225,
adapted to dev's non-heap code shape (no coli_metal_heap_free wrapper --
plain unregister-before-free).
The uring_load_add analog (E4 audit round-2 insurance) is deliberately not
carried: that arm is #ifdef __linux__-gated while COLI_METAL is macOS-only,
so it is dead code on every real build target, and unlike E4 this branch has
no allocation-path reason to touch the function.
Reachable only through allocation failure mid-load; verified by inspection
and clean builds (no OOM-injection harness in tree). SUMMARY.md item 10
updated to "carried on this branch".
monotophic
e011092ce1