[Python-Dev] test_logging failing on Windows 2000 (original) (raw)

Guido van Rossum guido@python.org
Wed, 15 Jan 2003 19:59:07 -0500

For some reason, testlogging.py is failing on my machine - but only when run via "regrtest.py" - running stand-alone works fine.

The output I see is: testlogging Traceback (most recent call last): File "E:\src\python-cvs\lib\logging_init.py", line 645, in emit_ self.stream.write("%s\n" % msg) ValueError: I/O operation on closed file Traceback (most recent call last): File "E:\src\python-cvs\lib\logging_init.py", line 645, in emit_ self.stream.write("%s\n" % msg) Vtest testlogging produced unexpected output: [Sometimes the "ValueError" will be repeated quite a few times. Often these exceptions are intermingled with the next test output - ie, the logging test continues to run even once the following test has started.] I am guessing that some threads are spawned, but for some reason we aren't waiting for them to complete before closing the output file. I will have a look at this once I actually finish what I was trying to start - but if someone has a clue, let me know!

I had this exact same failure mode too, on Linux -- and then the next day I couldn't reproduce it!

Glad it's not just me, and not just Linux either. :-)

I guess the test is using threads and there's a race condition.

No time to actually look at any code, but it might be obvious. :-(

--Guido van Rossum (home page: http://www.python.org/~guido/)