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Tim, these bugs are quite difficult to trigger, but they can
hide any kind of file error and lose arbitrarily large
amounts of data.

Here, the following program will run indefinitely:

full = open('/dev/full', 'w')
while 1:
    print >>full, 'x' * 1023
    print >>full

It seems to be essential that both the character that fills
the file buffer (here it is 1024 bytes long) and the next
are generated implicitly by print - otherwise the write
error will be detected.