Antoine Pitrou added the comment:
I know nothing about TUN but you may simply be hitting this code path:
https://github.com/spotify/linux/blob/master/drivers/net/tun.c#L601-L614
Since:
>>> ('e'.encode()[0] & 0xf0) in (0x40, 0x60)
True
>>> ('é'.encode()[0] & 0xf0) in (0x40, 0x60)
False
writing 'é'.encode() will hit the EINVAL-returning path. The bottom line is
that TUN devices don't seem to support free-form data, but expect a certain
format.
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nosy: +neologix
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<http://bugs.python.org/issue30430>
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