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authorArthur Hanson Rasmusson <arthur@vgpu.io>2026-10-18 14:53:33 -0400
committerArthur Hanson Rasmusson <arthur@vgpu.io>2026-10-18 14:53:45 -0400
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parent11c141c446bae4ba2a193cd6a709819ec125b78c (diff)
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vgsp: fail4 r227 - INPUT-ALIAS-WIT rec census + RETIRE-WIT rec-array witness
r227 verdict inputs: GRID-WIT == the guest's own geometry for every kernel (gemm_nn w12=0x10 w13=0x4, gemm_nt w12=0x4, softmax w12=0x40, block dims in w18/w19) - no QMD geometry emission bug; the old consecutive-pair IN-ALIAS stayed silent. Two new witnesses for the next capture: - INPUT-ALIAS-WIT: per-launch census of the copy-in recs (the exact VA -> HPA -> content triples the engine reads, inputs included; the fill already covers them as recs). Every non-zero rec is compared against the last 64: distinct VA -> same HPA is the resolver-aliasing smoking gun; distinct HPA with equal content is the upstream-write-clone class. Zero pages excluded on both sides. Replaces the consecutive-only check. - RETIRE-WIT: one line per launch at the retirement wait with n_data, n_tracked and the first/last recs' va/reloc_va/bi. r227's numbers are impossible under this source (retire n_tracked 4/4/4/1/1/16/16 vs copy-in/copy-out 1482/1418/1354/913/864/882/1290 recs for the same launch), so either the rec array genuinely aliases reloc VAs at run time or the deployed module differs from this tree; RETIRE-WIT shows which in one line (sequential in-region rels + n_data=1482 with n_tracked=4 would prove the former). Logging-only; no behaviour change; greens safe. Build green. (cherry picked from commit 1dbde7967bda4ba51dadf8a96e8aeaacc44c5575)
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