[New-bugs-announce] [issue44008] os.walk and other directory traversal does not handle recursive mounts on Windows

[R0b0t1]

New submission from R0b0t1 <sid at aeam.us>:

Using `os.walk` to traverse a filesystem on Windows does not terminate in the case of a recursive mountpoint existing somewhere in the path.

In my case C:\circlemount is linked to C:\, producing paths such as C:\circlemount\circlemount\circlemount\circlemount\...

A drive mount point may be set up as follows:

```diskpart (enters shell)
list volume`
select volume ${#}`
assign mount=${path}
```

Notably this only happens for Win32 python. Cygwin and MSYS2 pythons as well as the pythons distributed with some packages like Inkscape behave properly.

----------
components: Windows
messages: 392666
nosy: R0b0t1, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: os.walk and other directory traversal does not handle recursive mounts on Windows
type: behavior
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44008>
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