svn: Ran out of unique names

what is the cause of this message? how do I get rid of it? I'm getting
it from apache-spawned svn process when trying to get a diff. it works
just fine if I request the same diff in the shell.

svn: Ran out of unique names
svn: svn_io_open_unique_file: unable to make name for 'tmp'

hmm, looks like just about any `svn diff` run from apache causes this
error.

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