[tor-relays] why are so many OR connections closed with IOERROR ?

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I do run a Tor exit relay under a 64 bit hardened Gentoo as OS and do wonder about a Trac issue reported in [1]. About 2/3 of all closed onion connections returns IOERROR instead of DONE as seen using [2]. That's why I'm asking here if other made a similar experience under a different OS ?

[1] https://trac.torproject.org/projects/tor/ticket/13603 [2] https://github.com/toralf/torutils/blob/master/err.py - -- Toralf PGP: C4EACDDE 0076E94E, OTR: 420E74C8 30246EE7