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Stage D: parked-idle VMs are killable, KILL unregisters; fix uninitialized pending_reap (FABRIC-3.8 §3.5, G6)

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sk_vm_parked_idle(): saved context + exactly its own IDLE frame.
capsule_vm_kill_refusal() is the single kill rule, shared by
capsule_vm_kill() and the KILL word: refuse SWITCHED_OUT mid-task, parked
with mail pending, or the VM running; allow parked-idle. capsule_vm_kill()
now unregisters the switch slot (G6).

Finding fixed: vm_registry_alloc() never initialized pending_reap (kmalloc
does not zero); C-b's reap_pending walks every participant, so garbage
reaped a healthy VM (seen live before any KILL). Now zeroed at alloc.

Probe (reverted): baseline KILL refused, slots 3->4->4 (FAIL, proves G6);
with Stage D dprobe parked idle, KILL dead, slots 3->4->3, PASS on amd64/
aarch64/riscv64. Acceptance: dict_hash unchanged, relay 3, idle growth 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-09-23 19:14:50 -04:00
co-authored by Claude Opus 5.5
parent 06bcab504d
commit 604ad7aadc
25 changed files with 82548 additions and 15 deletions
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capsules/BLOCK_MAP.md
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# Capsule Block Manifest — Auto-generated
<!-- Generated by mkcapsule --manifest 2026-09-23T21:45:34Z -->
<!-- Generated by mkcapsule --manifest 2026-09-23T23:07:10Z -->
<!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh. -->
<!-- Hand-written justifications and immutability notes live -->
<!-- in MANIFEST.md alongside this auto-generated index. -->