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>

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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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