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[iterate-2G] db16cyc spin-hint cooperative yield: unblock title-screen 0x10a0 gate

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The silph title state machine (tid13) blocked on event 0x10a0, never signaled.
Root: the event's producer chain runs on the silph worker (entry 0x821C4AD0,
our tid14), which was starved. tid14 shares a HW slot with a guest spinlock/
barrier participant (sub_824D1328, entry 0x824D2940) that busy-spins on the
db16cyc hint `or r31,r31,r31` (encoding 0x7FFFFB78) at 0x824D140C. Under our
round-robin lockstep the spinner consumed its whole block every round and
starved the co-located tid14 (only 9 progress hits over 200M instr) — so the
producer never reached the event-create/duplicate/signal dance the canary
oracle performs (handle F80000E8 set by the submitter F8000044 via a duplicated
handle).

Fix (canary-faithful): recognize the db16cyc spin hint exactly as canary's
InstrEmit_orx does (code 0x7FFFFB78 -> DelayExecution) and surface it as a new
StepResult::Yield. The scheduler's yield_current() promotes every Ready peer on
the slot past STARVE_LIMIT so begin_slot_visit picks one next round, then they
reset and the spinner reclaims the slot — fair alternation, no priority
inversion, pure function of slot state (deterministic).

Result (lockstep, cache-persist, -n 200M): tid14 progresses past its old stall
into a real wait; tid13 advances off 0x10a0 to a new event; hub/submitter
re-enter their wait loops. imports 280k->592k, packets 124M->164M, swaps 1->2.
draws still 0 (the splash's first draw is a further-upstream gate).

Determinism preserved (two cold n50m runs byte-identical). n50m golden
re-baselined (imports 90296->339766, swaps 1->2; draws unchanged 0). n2m
golden unchanged (db16cyc not reached in first 2M). Tests 670/670.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-06-13 10:38:17 +02:00
parent f3b7e8b760
commit de21c7a544
31 changed files with 433587 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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audit-runs/audit-059-handle-disambiguation/round36-dispatcher-ctx/first-fire.txt Normal file
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K> F8000008 AUDIT-HLC JitProlog pc=821741C8 tid=00000006 r3=BCCC4A80 r4=00000018 r5=828F3888 r6=701CF924 r7=82456F00 r8=00000000 r9=00000000 r10=00000018 lr=822F1D5C
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+00: BC22C910 00010004 00000000 000003E8
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+10: 0101FFFF 00000000 00000000 01010000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+20: FFFFFFFF 00000000 00000000 00000000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+30: 00000000 BC365BC0 00000000 00000000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+40: 00000000 00000000 00000000 BDE9A398
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+50: BC365560 00000000 00000000 00000000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+60: 00000000 00000000 00000000 01010040
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+70: 00000000 00000000 00000000 FFFFFFFF
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+80: 00000000 00000000 00000000 BC22C930
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+90: 00000000 00000001 00000800 00000000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+A0: F800004C 00000000 00000000 BC365220
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+B0: BC3655C0 00000000 00000000 00000000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+C0: 00CC0048 00460020 00460072 00650071
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+D0: 00750065 006E0063 00790000 01010000
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+E0: 00000000 00000000 00000000 FFFFFFFF
K> F8000008 AUDIT-HLC JitProlog pc=821741C8 r3+F0: 00000000 00000000 00000000 BD610B80