Bugs item #1425127, was opened at 2006-02-06 11:44
Message generated for change (Comment added) made by effbot
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: cheops (atila-cheops)
Assigned to: Nobody/Anonymous (nobody)
Summary: os.remove OSError: [Errno 13] Permission denied
Initial Comment:
When running the following program I get frequent
errors like this one
Exception in thread Thread-4:
Traceback (most recent call last):
File "C:\Python24\lib\threading.py", line 442, in
__bootstrap
self.run()
File "os.remove.py", line 25, in run
os.remove(filename)
OSError: [Errno 13] Permission denied:
'c:\\docume~1\\joag\\locals~1\\temp\\tmpx91tkx'
When leaving out the touch statement(line 24) in the
loop of the class, I do not get any errors.
This is on Windows XP SP2 with python-2.4.2 (you should
have an exe touch somewhere in you path for this to
work) Can somebody shed any light on this please?
Thanks in advance
Joram Agten
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>Comment By: Fredrik Lundh (effbot)
Date: 2006-02-07 00:05
Message:
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> The problem is that there's no reason to believe anything
> he did here _does_ leave files open.
Except that he's hitting the file system quite heavily, and
asyncronously. My guess is that Windows simply gets behind
(a quick filemon test indicates that this is indeed the
case; just before a crash, I see the events CREATE/SUCCESS,
QUERY/SUCCESS, QUERY/SUCCESS, WRITE/SUCCESS, and
OPEN/SHARING VIOLATION for the failing file, with lots of
requests for other files interleaved).
Unless someone wants to fix Windows, a simple workaround
would be to retry the os.remove a few times before giving up
(with a time.sleep(0.1) in between).
----------------------------------------------------------------------
Comment By: cheops (atila-cheops)
Date: 2006-02-06 23:53
Message:
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I did post on the python mailing list first, but got no
responce there, after further looking into it, I seriously
think there is at least one bug here.
here is the link to the post:
http://mail.python.org/pipermail/python-list/2006-
February/323650.html
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Comment By: Tim Peters (tim_one)
Date: 2006-02-06 23:19
Message:
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user_id=31435
The problem is that there's no reason to believe anything he
did here _does_ leave files open. I can confirm the
"permission denied" symptom, and even if I arrange for the
call to "touch" to run a touch.bat that doesn't even look at
the filename passed to it (let alone open or modify the file).
I also see a large number of errors of this sort:
Exception in thread Thread-8:
Traceback (most recent call last):
File "C:\python24\lib\threading.py", line 442, in __bootstrap
self.run()
File "osremove.py", line 21, in run
touch(filename)
File "osremove.py", line 8, in touch
stdin=None, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
File "C:\python24\lib\subprocess.py", line 490, in __init__
_cleanup()
File "C:\python24\lib\subprocess.py", line 398, in _cleanup
inst.poll()
File "C:\python24\lib\subprocess.py", line 739, in poll
_active.remove(self)
ValueError: list.remove(x): x not in list
Those are clearly due to subprocess.py internals on Windows,
where the poll() and wait() methods and the module internal
_cleanup() function aren't called in mutually threadsafe
ways. _Those_ errors can be stopped by commenting out the
_cleanup() call at the start of Popen.__init__() (think
about what happens when multiple threads call _cleanup() at
overlapping times on Windows: all those threads can end up
trying to remove the same items from _active, but only one
thread per item can succeed).
The "permission denied" errors persist, though.
So there's at least one class of subprocess.py Windows bugs
here, and another class of Windows mysteries. I believe
subprocess.py is a red herring wrt the latter, though. For
example, I see much the same if I use os.system() to run
`touch` instead.
----------------------------------------------------------------------
Comment By: Fredrik Lundh (effbot)
Date: 2006-02-06 22:50
Message:
Logged In: YES
user_id=38376
If Python gives you a permission error, that's because
Windows cannot remove the file. Windows does, in general,
not allow you to remove files that are held open by some
process.
I suggest taking this issue to comp.lang.python. The bug
tracker is not the right place for code review and other
support issues.
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