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From: MRAB <python@mrabarnett.plus.com>
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Subject: Re: shutil.rmtree() fails when used in Fedora (rpm) "mock" environment
Date: Thu, 24 Oct 2024 18:08:02 +0100
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Bytes: 6104

On 2024-10-24 17:30, Left Right wrote:
> > The stack is created on line 760 with os.lstat and entries are appended
> > on lines 677 (os.rmdir), 679 (os.close) and 689 (os.lstat).
> >
> > 'func' is popped off the stack on line 651 and check in the following lines.
> >
> > I can't see anywhere else where something else is put onto the stack or
> > an entry is replaced.
>
> But how do you know this code isn't executed from different threads?
> What I anticipate to be the problem is that the "os" module is
> imported twice, and there are two references to "os.lstat".  Normally,
> this wouldn't cause a problem, because they are the same function that
> doesn't have any state, but once you are trying to compare them, the
> identity test will fail, because those functions were loaded multiple
> times into different memory locations.
>
> I don't know of any specific mechanism for forcing the interpreter to
> import the same module multiple times, but if that was possible (which
> in principle it is), then it would explain the behavior.
The stack is a local variable and os.lstat, etc, are pushed and popped 
in one function and then another that it calls, so they're in the same 
thread.