Files
LithosAnanake/experiments/bare_metal/runs/doe-amd64-20260913-194553.csv
T
Robert Allan JamesandClaude Sonnet 5 862d7d9c48
Build / build-amd64-iso (push) Waiting to run
Build / build-aarch64-iso (push) Waiting to run
Build / build-riscv64-img (push) Waiting to run
Stage 3 follow-on: fix stack-ownership corruption + DoE switch columns (FABRIC-3.md §XXVIII.1)
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
2026-09-13 23:58:59 -04:00

28 KiB

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