Too late: 2.3.1 is in at least some versions of Debian already -- I'm getting reports on the os.fsync() issue already from my users (it breaks getmail). Could 2.3.1 be revoked or replaced ASAP? "2.3.1b" or similar with only this change would suit me.
That doesn't fit in the numbering scheme, it would have to be 2.3.2. Given the amount of traffic about this I'm tempted to agree that we need to move quickly and issue a fix for this issue (only).
--Guido van Rossum (home page: http://www.python.org/%7Eguido/)