dune_trace: ignore writes after close#14783
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Track whether the trace output has been closed and make emit and flush no-ops after close. This makes close idempotent and avoids writing to a closed trace fd from late worker threads. Signed-off-by: Rudi Grinberg <me@rgrinberg.com>
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Track whether the trace output has been closed and make emit and flush no-ops after close. This makes close idempotent and avoids writing to a closed trace fd from late worker threads.