New submission from 施文峰 <ke26537...@gmail.com>:

happen at io's reading & updating(r+) mode
if you remove whole content ( truncate(0) ), tell wil not back to 0
then you start writing will start at current position
that's why problem happen

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41441>
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