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regression: test-arm32#src:test/test_reactor.pas red at aaa58e72c1e8 (auto-filed by twatch)

Repro

tools/testmgr.py --tier full --job 'test-arm32#src:test/test_reactor.pas' at aaa58e72c1e8b7c2a4af9f33d89e4e6ea524027e

Range

bad aaa58e72c1e8, last good aaa58e72c1e8, 0 commit(s) in range — the watcher narrows this by idle bisect; check tstate/TSTATE.md for the current range.

Log tail

ok: /tmp/testmgr-scratch-458448/test_arm32_reactor  [code=174260B  data=536B  bss=38408B  procs=140]

Stub ticket: signal only. Track T agent (face 2) enriches or a dev track takes it from the repro line.

RESOLVED 2026-07-12 (ed106ab5) — not a coroutine bug: the canary constant

Root cause is shared by all 12 jobs in this family. CO_CANARY = $C0DECAFE in lib/rtl/scheduler.pas is written and read through PW = ^NativeInt — SIGNED, and 32-bit on i386/arm32/riscv32 — so the high bit makes it sign-extend to a negative on load. It only ever compared equal because the named constant was itself being truncated to a 32-bit Integer. Commit 89366847 (a correct fix: constants above MaxInt are now typed Int64) widened the comparison to 64 bits, and a perfectly healthy stack started reading as clobbered -> Halt(217).

Fixed by keeping the guard below $80000000 ($4C0DECAF). make test-i386 and make test-arm32 fully green.