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A process which is exiting due to a core dumping signal doesn't propagate the correct exist status after dumping core, because 'dumper' itself forcibly terminates the process. Use 'dumper -n' to avoid killing the dumped process, so we continue to the end of signal_exit(), to exit with the 128+signal exit status. Busy-wait in exec_prepared_command() in an attempt to reliably notice the dumper attaching, so we don't get stuck there. Also: document these important facts for custom uses of error_start.
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