New submission from James Kesser:

I believe I have come across a bug with RotatingFileHandler in 
logging/handlers.py

The attached script shows that when you are logging using RotatingFileHandler 
pointed at the same file from multiple logger instances, it works at first 
showing logging events from each. However, after the first rotation occurs, the 
events seem to be "group" together and do not get logged in order. Instead they 
are logged in groups according to which instance is performing the logging.

NOTE: While searching for a bug report of this issue I was flooded with issues 
relating to multiple processes. This is not the case here. I have attached a 
script and the log files that are generated when running this as a single 
process / thread.

first log file contains:

a aaa...
b bbb...
a aaa...
b bbb...
a aaa...
b bbb...
a aaa...
b bbb...
a aaa...

subsequent log files contain events all from either a or b only, not 
intertwined like you would expect.

I first noticed this using v2.4.3 of the logging library, however I was able to 
reproduce this on 2.7 and 3.3 as well.

----------
components: Library (Lib)
files: rotating_file_handler_test.tar
messages: 184061
nosy: James.Kesser
priority: normal
severity: normal
status: open
title: RotatingFileHandler issue when using multiple loggers instances (but one 
process/thread) to the same file
versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3
Added file: http://bugs.python.org/file29393/rotating_file_handler_test.tar

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17407>
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