- Fixed a potential hang bug in wait_for_receiver() that could occur
if the io_flush() call happened to read the last message from the receiver, causing the read_msg_fd() call to deadlock. - Fixed an error-looping problem when the server-side receiver failed to send a message down the error-msg pipe: we no longer try to send a new error about this new failure down the same failing pipe. - Make sure that we stop any deferring of forwarded messages in the generator when we are exiting with an error.
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