call site 5 for execnet.Channel.__del__
test/rsession/testing/test_hostmanage.py - line 227
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   def test_hostmanager_init_rsync_roots(self):
       dir2 = self.source.ensure("dir1", "dir2", dir=1)
       self.source.ensure("dir1", "somefile", dir=1)
       dir2.ensure("hello")
       self.source.ensure("bogusdir", "file")
       self.source.join("conftest.py").write(py.code.Source("""
               dist_rsync_roots = ['dir1/dir2']
           """))
       config = py.test.config._reparse([self.source])
       hm = HostManager(config, 
                        hosts=[HostInfo("localhost:" + str(self.dest))])
       events = []
->     hm.init_rsync(reporter=events.append)
       assert self.dest.join("dir2").check()
       assert not self.dest.join("dir1").check()
       assert not self.dest.join("bogus").check()