transaction.commit_on_success committing prematurely?

I'm having some issues with commit_on_success.  It appears to be
committing prematurely, and I'm not quite sure why.

I have the following code:

@transaction.commit_on_success
def test():
s = Somemodel.objects.all()[0]
s.hostname = 'this_is_a_test'
s.save()
raise AttributeError('oh no')

>>> test()
AttributeError: oh no

This code produces these queries:
...
6 Query UPDATE somemodel` SET `hostname` = 'this_is_a_test' ...
6 Query commit

I don't understand why my update is being committed, is there
something I'm missing here?

My database is mysql, and my tables are InnoDB.

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