Robert Allan JamesandClaude Sonnet 5
862d7d9c48
DoE CSV gained 6 switch-signal columns (switch_count_cumulative, switch_current_slot, switch_*_readiness, switch_ticks_since), and verifying them with a boot-time HB-ON probe surfaced a real livelock: the preemption checkpoint could fire inside a VM-EXEC-nested execute_colon_word() call and switch away from a stack it didn't own, parking a borrowed region of the caller's stack under the wrong VM's saved-context pointer. The trampoline bounce was the visible (safe) half of this; the corruption was the quiet half, live in every prior "clean" Stage 3 boot without ever showing up in the log. Fixed by gating the checkpoint on being at the outermost vm_interpret() call (g_vm_interpret_depth / sk_vm_at_outermost_interpret(), vm_core.c), per Bob's decision. Also fixed two related bugs found in the same pass: g_switch_back_to was a single global stale after first entry, now per-VM state (native_switch_back_to); note_switch_performed() fired on resume instead of switch-out, now called before the switch. Verified on all 3 architectures: steady log growth (no freeze), zero leaked QEMU processes, DoE columns internally consistent, Hermes/Artemis confirmed genuinely executing (not just trampoline-bouncing). Temporary HB-ON boot probe reverted after capture. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016UNhH1mhi52i6Qihh7ZV5S
capsules/
FORTH personality files loaded by the VM at boot. A capsule is an immutable, content-addressed payload; its XXHash64 hash is its identity. Any mutation changes the hash and the birth protocol rejects the image.
Key files
| File | Type | Purpose |
|---|---|---|
init.4th |
(m) MAMA_INIT |
Default Mama VM personality — loaded at LBN 2048 |
ACL.4th |
user | Word-level ACL system; self-activating at boot |
zuse.4th |
user | Bootstrap superuser; loaded by ACL.4th |
doe.4th |
user | DoE workload words (EXEC-DOE) — opt-in |
workload-0.4th … workload-9.4th |
(p) |
Numbered personality variants |
init-l8-*.4th |
(p) |
L8 Jacquard mode variants (stable/volatile/diverse/temporal/transition/omni) |
hermes/init.4th |
(p) |
Hermes baby VM personality |
artemis/init.4th |
(p) |
Artemis baby VM personality |
Block namespace
Block ranges are shared across all loaded capsules — collisions cause silent word-definition overwrites.
| Range | Owner |
|---|---|
| 2048–2099 | init.4th |
| 2100–2199 | doe.4th |
| 3000–3999 | workload capsules |
| 4000+ | user-defined (ACL.4th, zuse.4th, …) |
Each block is limited to 1024 bytes. Verify with wc -c before committing.
See also
experiments/bare_metal/README.md— DoE protocols and block namespace rulesdocs/03-architecture/word-acl/DESIGN.md— ACL system designtools/mkcapsule.c— assembles capsules intocapsule_generated.c- Project root