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fix(drift-trio): pin fiber slot across asyncify parks (#10b layer 1)

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Symbolized (HOIST_KEEP_NAMES=1): the trap is on the asyncify REWIND re-entering
the fiber — stack-local COROUTINE+body were destroyed when Call() returned
early on a park, so the rewind called through freed objects (latent UB in the
ORIGINAL fire-and-forget runOnFiber too). Heap-pinned FiberSlot + explicit
done flag + fiber-tail re-drain. Layer 2 (rewind interplay) still open —
fuzz stays fixme'd; pageerror stacks now captured in fuzz artifacts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G5cAM9M6q34n5X4dbrfVvi
This commit is contained in:
Gergő Törcsvári 2026-07-21 12:45:51 +02:00
commit 22cd32b7b2
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2 changed files with 76 additions and 11 deletions
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4
tests/kicad/drift-trio-fuzz.spec.ts
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@ -438,7 +438,9 @@ for (const [cfg, label, mkActions, seedReg] of [
const t = m.text();
if (/collab|drift|parse|error|abort/i.test(t)) consoles[tabLabel]!.push(t.slice(0, 400));
});
page.on("pageerror", (e) => consoles[tabLabel]!.push(`PAGEERROR ${e.message}`));
page.on("pageerror", (e) =>
consoles[tabLabel]!.push(`PAGEERROR ${e.message}\nSTACK ${(e.stack ?? "").slice(0, 4000)}`),
);
}
const actions = mkActions();
const reg = seedReg();