Thomas Grainger <tagr...@gmail.com> added the comment:
I can confirm this happens on py3.5-3.10
```
import mmap
import pathlib
import tempfile
def main():
with tempfile.TemporaryDirectory() as tmp:
tmp_path = pathlib.Path(tmp)
path = tmp_path / "eg"
path.write_bytes(b"Hello, World!")
with path.open("rb") as rf:
mm = mmap.mmap(rf.fileno(), 0, mmap.MAP_SHARED, mmap.PROT_READ)
path.write_bytes(b"")
bytes(mm)
if __name__ == "__main__":
main()
```
----------
nosy: +graingert
versions: +Python 3.10, Python 3.6, Python 3.7, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40720>
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