Your message dated Sun, 3 Jul 2016 11:22:15 +0200 with message-id <[email protected]> and subject line closing bugs reported against ancient python versions has caused the Debian Bug report #451733, regarding python2.5: [mailbox] race: mbox may lose data with concurrent access to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 451733: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=451733 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: python2.5 Version: 2.5-5 Severity: important Hi, the mailbox._singlefileMailbox class is not safe with concurrent access, because mailbox._singlefileMailbox.flush() replaces the underlying file with a new copy by constructing a temporary file and then renaming it. This breaks all other class instances which have this mailbox open. I'm attaching a script demonstrating the problem. I think it's a bad idea to use rename(2) here; overwriting the file content would fix the race condition, and #451274 too[1]. Nikolaus [1] "python2.5: [mailbox] cannot modify mailboxes in system mail spool" http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=451274 -- System Information: Debian Release: 4.0 APT prefers stable APT policy: (500, 'stable') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.18-5-k7 Locale: LANG=de_DE@euro, LC_CTYPE=de_DE@euro (charmap=ISO-8859-15) Versions of packages python2.5 depends on: ii libbz2-1.0 1.0.3-6 high-quality block-sorting file co ii libc6 2.3.6.ds1-13etch2 GNU C Library: Shared libraries ii libdb4.4 4.4.20-8 Berkeley v4.4 Database Libraries [ ii libncursesw5 5.5-5 Shared libraries for terminal hand ii libreadline5 5.2-2 GNU readline and history libraries ii libsqlite3-0 3.3.8-1.1 SQLite 3 shared library ii libssl0.9.8 0.9.8c-4etch1 SSL shared libraries ii mime-support 3.39-1 MIME files 'mime.types' & 'mailcap ii python2.5-minimal 2.5-5 A minimal subset of the Python lan python2.5 recommends no packages. -- no debconf information#!/usr/bin/python2.5 import mailbox import os import time import tempfile msg_text = ("""Subject: Ghost message This message should be deleted. """, """Subject: New message This message should be the only one in the mailbox. """) mbox_name = tempfile.mkstemp(prefix="race-mbox")[1] def printmbox(m): if not mbox: print("<empty>") else: for msg in mbox: print(msg) print if os.fork(): # first mbox user mbox = mailbox.mbox(mbox_name) mbox.lock() mbox.add(msg_text[0]) mbox.clear() print("=== mbox after first client finished:\n") printmbox(mbox) # now empty mbox.close() os.wait() mbox = mailbox.mbox(mbox_name) print("=== mbox after second client finished:\n") printmbox(mbox) # has now both messages. os.remove(mbox_name) else: # second mbox user mbox = mailbox.mbox(mbox_name) time.sleep(1) mbox.lock() mbox.add(msg_text[1]) mbox.close()
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--- Begin Message ---This bug has been reported against an ancient version of python (2.5/3.1), that was last released with Debian 6.0 (squeeze). But even squeeze-lts has now reached end-of-life and is no longer supported. The bug is assumed to be fixed (or no longer relevant) in newer python releases and therefore I'm closing this report now. If the problem is still reproducible in the currently supported versions (python2.7, python3.5/python3.6), feel free to provide more information, reopen and reassign this bug report. Andreas
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